DE102017205707A1 - Device with energy-dependent transmission power - Google Patents

Abstract

The invention relates to a device (1) with an energy converter (3), which serves to convert energy from the environment of the device (1) and / or from a mechanical actuation of the device (1) into electrical energy, a storage unit (5), which serves to store the electrical energy, and a radio unit (7) which serves to receive and / or transmit radio signals, wherein the radio unit (7) draws the electrical energy of the memory unit (5), esp. To send radio signals , and wherein the radio unit (7) has a processor unit (9) which serves to prepare a data packet to be transmitted as a radio signal and to set a transmission power of the radio unit, the device (1) being configured to have an energy amount currently stored in the memory unit (5). is available to determine and / or approximate, and that the processor unit (9) is adapted to the transmission power of the radio unit (7) on the basis of the determined and / or he approximated energy amount to adjust.

Description

The invention relates to a device with an energy converter, which serves to convert energy from the environment of the device and / or from a mechanical actuation of the device into electrical energy, a memory unit which serves to store the electrical energy, and a radio unit to the serves to receive and / or transmit radio signals, wherein the radio unit draws the electrical energy of the storage unit, in particular to transmit radio signals, and wherein the radio unit comprises a processor unit which serves to prepare a signal packet to be sent as a radio signal and set a transmission power of the radio unit.

Such devices are used to remotely control other electrical devices or to send information. For example, such a device may be formed as a radio switch, which is used to turn on / off a light module. Such devices can advantageously be placed in places where power supply would be difficult. Because such devices are energy self-sufficient, they can be flexibly placed and mounted. A relocation or repositioning of such a device can thus be done just as easily. Furthermore, no batteries are needed and the effort associated with charging a battery is eliminated. However, such self-sufficient radio-capable devices require an energy converter that generates sufficient energy to operate the device and send out a radio signal.

For the purposes of the invention, the term radio signal or radio unit is not exclusively to be associated with electromagnetic signals of a specific frequency range, but may also be at least ultrasonic signals, laser signals and / or infrared signals.

Such devices are used in applications where various environmental conditions prevail, and thus must be designed to remain functional under various operating conditions. For example, a self-sufficient radio switch from - 40 to 85 degrees to be fully functional.

Fully functional means at least that sufficient energy is available to send a complete message. For energy converters having copper lines, such as a copper coil in an electromechanical generator, the ambient temperature can play a non-negligible role in the efficiency of the energy converter because the conductivity of copper coils is temperature dependent. As the ambient temperature increases, the amount of energy generated by actuation is reduced.

Component tolerances also cause energy converters produced in a series to produce different amounts of energy (per actuation, for example), depending on the exact design of the components. Also, the speed of a specific actuation can affect the amount of energy produced. Autonomous wireless switches are therefore designed so that, taking into account a given tolerance range and at temperatures between minus 40 degrees and plus 85 degrees, enough electrical energy is generated to be able to send a complete message. A consequence of this design is that in most conditions of use, a non-negligible amount of energy remains after sending a message.

The remaining energy will conventionally be dissipated useless, for example, by dissipating the energy through a resistor to return the radio switch to an input state. Thus, the radio switch is ready for re-operation. In the US patent US 2002/0190610 A1 discloses a system in which a radio switch prepares and transmits a message only after a capacitor stores a predetermined amount of energy or after the voltage across the capacitor exceeds a predetermined threshold. If too much energy remains after a transmission in the capacitor, so that the voltage does not fall below this threshold again, the threshold value can not be exceeded. It can then be recognized but no re-actuation.

This patent US 2002/0190610 A1 further discloses that an energy management unit selectively drives a radio frequency transmitter. In particular, the carrier frequency is only driven after a voltage exceeds a threshold to get the highest utilization from the generated energy.

With this background, it is the object of the invention to propose a device that deals more efficiently with the energy amount of the energy converter generated.

The object is achieved by a device according to claim 1 and by a method according to claim 10. Advantageous embodiments of the invention are subject of the dependent claims.

Thus, the object is achieved by a device with an energy converter, which serves to energy from the environment of the device and / or from a mechanical actuation of the device into electrical energy, with a storage unit which serves to store the electrical energy, and with a radio unit which serves to receive and / or transmit radio signals, the radio unit drawing in the electrical energy of the storage unit in particular for transmitting radio signals, and wherein the radio unit has a processor unit which serves to prepare a data packet to be transmitted as a radio signal and to set a transmission power of the radio unit, the device being configured to allocate an amount of energy currently available in the memory unit determine and / or approximate, and wherein the processor unit is adapted to adjust the transmission power of the radio unit based on an energy value representing the determined and / or approximated amount of energy.

The storage unit may be a capacitor. The radio unit can be a transmitter circuit, which is designed, for example, to emit radio signals in a 2.4 gigahertz band. Otherwise, however, it may also be an ultrasound transmitter or an infrared transmitter unit. The processor unit may be, for example, a microprocessor.

The device is thus capable of setting a transmission power or prescribing a consumption of the device, after it is noted, how much energy is currently available. In this case, the amount of energy in the storage unit can be determined and / or approximated. Basically, there are several ways to check how much energy is currently available. It would be possible to perform a current measurement between the energy converter and the storage unit to determine how much energy is flowing from the energy converter into the storage unit. Otherwise, it would be possible to use one or more sensors that monitor the state of the energy converters so as to be able to approximate how much energy the energy converter can generate or generate at a given time or under certain conditions. The energy converter may be, for example, an electromechanical generator comprising a copper coil.

In an advantageous embodiment, the energy converter is an induction generator for a radio switch comprising a magnetic element having a north pole contact section and a south pole contact section, and a coil core having pole contact sections which can be contacted with the north pole contact section and the south pole contact section, the magnet element and the coil core being arranged relative to one another such that they are movable a magnetic flux direction reversal in the coil core can be generated when changing between a first and second rest position defining a direction of movement for the relative movement, in which the north pole and south pole contact sections respectively contact the respectively assigned pole contact sections. The induction generator may have a magnetizable sliding contact section extending parallel to the direction of movement for sliding guidance of the relative movement between the coil core and the magnetic element.

The memory unit can be scanned to determine the current amount of energy. In the case that the memory unit is a capacitor, the capacitor can be scanned by means of a high-voltage divider and an AD converter. When setting the transmission power, the processor unit takes into account the currently available energy. In this case, the processor unit can deduct an amount of energy which is required by the processor unit itself in order to prepare the data packet. The data packet can be prepared, for example, according to a standard protocol, for example a KNX protocol for building technology.

The device may interrogate the amount of energy in the memory unit several times to determine, for example, after a data packet has been sent, how much energy is still available in the memory unit.

In an advantageous embodiment, the device has a temperature sensor, wherein the device is designed to approximate the currently available amount of energy based on an ambient temperature determined by the temperature sensor. For this purpose, for example, a table can be stored in a data memory of the device, the table being polled regularly by the processor unit. For example, the table may include an association between environmental conditions such as temperature, device age, etc., and average expected amounts of energy generated by the energy converter under such conditions.

Depending on the type of energy converter, the amount of energy available may depend heavily on the ambient temperature at which the energy converter was actuated. Thus, it is possible to measure the ambient temperature during an actuation and thus to determine or find out an approximation value of the currently generated energy. In an advantageous embodiment, the device has a circuit which serves to determine the amount of energy currently available in the storage unit. Such a circuit can have high-resistance voltage parts as mentioned above. It would also be conceivable to carry out a step-by-step determination the energy level by means of, for example, a predetermined number of in parallel comparators. In a stepwise determination of the currently available energy amount, it would be conceivable to also control the transmitter power of the radio unit in stages.

Preferably, the transmission power is set by the processor unit so that the radio unit completely consumes the determined amount of energy when transmitting a data packet. If, however, due to a stepwise control of the transmission power, the processor unit can not set the transmitter power so that the determined amount of energy can be completely consumed, then the processor unit should control the transmitter power so that the radio unit at the sending of the data packet, the determined energy amount at least 50th % advantageously to 90% and very advantageously used up to 98%. To consume this amount of energy, the transmission power must be increased in most cases inevitably. Only under ambient conditions or operating conditions where the energy converter usually generates the least energy or converts it is to be expected that the transmission power can not be increased.

The device can thus at normal ambient temperature z. B. at room temperature of 25 degrees higher transmission power, for example, twice or three times higher than before. The range of a self-sufficient radio switch can thus be increased massively, according to the increase of the transmission power. At ambient conditions, such as at 60 degrees, where the energy converter can typically generate less energy than usual, such as at ambient temperatures between 20 and 30 degrees, the device will in any case still be able to send out a complete message.

In an alternative embodiment, it would be conceivable that the device adjusts the transmitter power so that it is possible to send out the complete message several times, for example twice. Thus, a redundancy can be ensured.

In an advantageous embodiment, the device has a circuit which serves to determine the amount of energy currently available in the storage unit. Furthermore, the circuit may comprise a voltage divider and an A / D converter, wherein the A / D converter is adapted to sample the voltage divider to determine a voltage formed in the memory unit and provide as a digital voltage value of the processor unit, or that Circuit has a voltage divider and that the processor unit comprises an A / D converter, wherein the A / D converter scans the voltage divider, thus to determine a voltage formed in the memory unit and to provide a digital voltage value in the processor unit. The transmission power can then be adjusted on the basis of the voltage value provided by the processor unit. In this case, the energy requirement other functions of the processor unit, such as logic processes of a logic switch block, are taken into account. Such a logic switching block can, for example, itself serve to calculate a transmission power of the radio circuit to be set on the basis of the provided voltage value.

In an advantageous embodiment of the device, the processor unit is designed to form a characteristic that maps a functional relationship between a power consumption of the radio unit per transmitted data packet as a function of the transmission power of the radio unit, wherein the processor unit when setting the transmission power one of the characteristic readable transmission power in which the energy consumption for a data packet essentially corresponds to the energy amount of the storage device. In this case, a transmission power can be selected for adjustment, which is associated with a certain energy consumption based on the characteristic, with this particular energy consumption of the energy amount of the storage unit when sending and / or repeated transmission of a complete data packet, is substantially exhausted. A data packet according to the invention corresponds to a complete message that can be assembled by a radio-enabled device and transmitted as a radio signal.

In a refinement of the embodiment of the device, the processor unit is designed to form the characteristic curve on the basis of the temperature value currently provided by the temperature sensor. In this case, it may be considered that the energy consumption of the radio unit may also have a temperature dependence at a predetermined transmission power.

It is conceivable to equip the device both with sensors that scans the available energy, as well as with sensors that serve to record the ambient conditions. Thus, the processor unit can form a characteristic curve based on environmental measured values and corresponding measured values of the energy amount. Likewise, a table can be provided.

In an advantageous embodiment, the device has a data storage unit, wherein a table is stored in the data storage unit, and wherein the processor unit is designed for this purpose based on the determined amount of energy in the Table to read out the energy amount associated transmission power and set for the radio unit.

In one embodiment of the device, the device is designed to approximate the currently available energy amount based on the ambient temperature, in which the device calculates the energy value on the basis of a reference value, the guide value depending on the expected electrical energy generated by a mechanical actuation of the device is to be expected at a measured temperature is given. For example, the guide value may correspond to an average value of energy values corresponding to the energy amounts determined in a previously performed calibration procedure. The expected energy amounts or guideline values usually change with the ambient temperature. The ambient temperature influences the efficiency of the energy converter. The guideline can thus be read from a known relationship between the amounts of energy generated by the energy converter during actuation and the ambient temperature.

• - Umgebungsenergie und/oder kinetische Energie von einer mechanischen Betätigung wird von einer Vorrichtung in elektrische Energie umgewandelt;
• - die elektrische Energie wird in einer Speichereinheit gespeichert;
• - eine Prozessoreinheit einer Funkeinheit wird initialisiert;
• - ein Datenpaket wird aufbereitet;
• - ein Energiebetrag der der aktuell in der Speichereinheit zu Verfügung steht wird ermittelt und/oder approximiert;
• - eine Sendeleistung der Funkeinheit wird anhand des Energiebetrags eingestellt,
• -der Datenpaket wird von der Funkeinheit gesendet.

The object is further achieved by a method comprising the following steps:

• - Environmental energy and / or kinetic energy from a mechanical actuation is converted by a device into electrical energy;
• the electrical energy is stored in a memory unit;
• a processor unit of a radio unit is initialized;
• - a data packet is processed;
• an amount of energy that is currently available in the memory unit is determined and / or approximated;
• a transmitting power of the radio unit is set on the basis of the energy amount,
• the data packet is sent by the radio unit.

The energy is converted by an energy converter or generator into electrical energy. After the generator operation, the energy generated can be rectified and stored temporarily in, for example, a storage unit designed as a storage capacitor. About a switching power supply, the voltage to the supply voltage of a configured as a microprocessor processor unit and on a designed as a high-frequency transmitter electronics transmission unit are passed and thus reduced. Via a direction detection circuit, the polarity of a generator pulse can be determined as needed. User data of a transmission protocol can be determined in the processor unit and the data packet can be assembled on the basis of this user data.

The energy in the memory unit can be determined via a high-impedance voltage divider, the voltage on the storage capacitor being sampled by means of an analog to digital converter integrated in the microprocessor. The capacitor voltage can serve as a selection argument for an assignment in a stored table for determining the most suitable transmission power, and the transmission power can be adjusted on the basis of such a table or a stored characteristic curve. Settings for the transmitter unit or the transmitter and the data packet can be written in a transmitter register. The data packet or the telegram or the telegrams can then be sent. If energy is still available in the storage unit, this energy can be dissipated by activating various consumers.

• 1: ein Blockschaltbild einer Ausgestaltung der Erfindung;
• 2: eine grafische Darstellung der Effektivität eines Energiewandlers in Bezug auf die Temperatur;
• 3: ein Blockschaltbild einer Ausgestaltung der Erfindung;
• 4: ein exemplarischer Spannungsverlauf am Kondensator; und
• 5: ein Verfahrensablauf gemäß einer Ausgestaltung der Erfindung.

The invention will be explained in more detail with reference to the following figures. They show:

• 1 a block diagram of an embodiment of the invention;
• 2 : a graphical representation of the effectiveness of an energy converter with respect to temperature;
• 3 a block diagram of an embodiment of the invention;
• 4 : an exemplary voltage curve at the capacitor; and
• 5 A procedure according to an embodiment of the invention.

1 shows a block diagram of an embodiment of the invention. An energy converter 3 is shown. This serves to energy from the environment of the device 1 either by a kind of energy harvesting to convert into electrical energy or the energy converter 3 is actuated and a mechanical energy applied by the actuation is converted into electrical energy by means of an electromechanical generator. The generator is, for example, an electromagnetic generator containing the copper coils.

At the energy converter 3 is a rectifier 19 connected. An electrical signal from the energy converter 3 output can thus be rectified. The rectifier 19 can be configured for example as a diode bridge. At the rectifier 19 is a storage unit 5 connected, here as a capacitor 5 is shown. The energy of the energy converter 3 is collected or generated, is thus in the capacitor 5 saved first. Conventionally, this energy is provided by a microprocessor 9 and bound transmitters 21 a radio unit 7 tapped around the microprocessor 9 and the radio circuit 7 to operate. To get the energy from the capacitor 5 in the microprocessor 9 usually introduce a voltage transformer 23 needed. The voltage can thus be reduced to a lower voltage level for insertion into the microprocessor 9 suitable is.

At a junction between the condenser 5 and voltage transformers 23 is a so-called voltage divider 17 connected. The voltage divider 17 For example, it can be made simple by connecting two resistors in series. At a node between the two resistors is a derivative, in turn, to the microprocessor 9 connected. It is thus possible the voltage across the capacitor 5 at predetermined times T1 , T2, T3 to determine how high the voltage across the capacitor 5 is or how much energy E _T in the condenser 5 is stored.

The microprocessor 9 or the processor unit 9 on the one hand serves the amount of currently available energy E _T check and the radio electronics 7 to operate. In particular, by the microprocessor 9 the transmission power of the radio electronics 7 set. Likewise, from the payload of a protocol of a data packet from the microprocessor 9 compiled or prepared. This data packet is then transmitted by the transmission electronics 21 or transmitter 21 via an antenna 25 sent out.

Such a system is conventionally designed so that the system typically consumes much more energy in the condenser 5 saves as needed to send a message. The background to this is that in certain environmental conditions, for example at high temperatures (T _EXT >> T _R ), it is not always possible to ensure that sufficient energy is obtained by operating the energy converter 3 is produced. Thus, the energy converter 3 designed so that in the worst case, for example, at very high temperatures, enough energy E ₀ is generated to the radio electronics 7 to operate and, in particular, to send out a complete message or data packet.

In the in the 1 shown embodiment, the currently available energy E _T in the condenser 5 is stored, checked. For example, this check may take place once. But it is also conceivable at regular intervals, the energy E _T to check. It is also possible to check the energy E before and after each transmission. When the amount of energy E _T in the condenser 5 is determined, the microprocessor 9 Use this information about the amount. The information about the energy E _T inside the capacitor 5 can be used for the transmission power of the radio electronics 7 adjust. When the amount of energy E _T , which is available, exceeds a predetermined threshold, the transmission power of the radio electronics 7 be increased so as to achieve a greater range of the transmitted signal. The transmission power can also be set so that a complete message can be sent out twice or three times completely. Thus, a redundancy can be ensured.

2 shows a graphic representation of the effectiveness of an energy converter 3 in terms of temperature T _ext . The energy converter 3 has an electromechanical generator, and is usually operated externally. The operating speed can vary. Therefore, an average course of the generated energy E _A with respect to the temperature is shown, but also an upper limit of the energy curve E _H when, for example, the energy converter 3 is operated at a very high speed and the design of the energy converter 3 is optimal within given manufacturing tolerances for energy production. A minimum course of energy production E _L is shown for the case where the energy converter 3 is slowly actuated and the design of the energy converter 3 within given manufacturing tolerances for power generation is worst.

The worst operating conditions are present when the energy converter 3 is operated slowly at very high temperatures. For the use of an energy converter 3 with a design that is worst within given production tolerances for power generation, is used under such conditions of use, a so-called minimum energy E ₀ be generated. The broken line shows the energy level needed in this case. Conventionally, such a device 1 designed so that with this minimum energy E ₀ a complete message can be sent out.

The representation of the minimum energy E ₀ as well as the energy courses in 2 serves only as an example and should not be interpreted as true to scale. Nevertheless, it can be seen that a rapid actuation, even at a high temperature, can leave a non-negligible amount of energy, even after a complete message from the radio electronics 7 is sent out. The invention enables by scanning the storage unit 5 a reuse of this energy left over. Traditionally, this energy was dissipated through a resistor and thus discarded. An embodiment of the invention as in 1 shown, but can the capacitor 5 sample and information about a leftover amount of energy in the capacitor 5 and the microcontroller 9 hand off. The microcontroller 9 can use this energy-related information to, for example, the transmission power of the radio electronics 7 set again and send the message repeatedly.

A temperature range T _R is in 2 represented, which corresponds to about 20 degrees Celsius, or normal room temperature. A device 1 with an energy converter 3 and a radio electronics 7 can be used as a light switch, for example. However, a light switch is mainly used in ambient conditions where room temperature T _R prevails. Based on 2 It is seen that usually a variety of the minimum energy E ₀ always remains when used at about 20 degrees or at room temperature. By sampling the energy E _T in the condenser 5 Thus, the transmission power can be doubled or increased twice as much. In another way, it is also possible to send out a message several times completely in order to avoid redundancy and to avoid data errors during the transmission of these radio signals.

3 shows a further block diagram of an embodiment of the invention. An energy converter 3 is available, with a switch button 27 through a housing wall 29 protrudes. The other components are all from the housing 29 locked in. As with the in 1 illustrated embodiment, the energy from the energy converter 3 to a storage unit 7 forwarded. A power supply line 31 is also between capacitor 5 and a circuit board on the one processor unit 9 or a radio electronics 7 settled are provided. As well as in 1 is a voltage divider 17 present, which is a sampling of the capacitor 5 energy E _T allows. Unlike the in 1 shown embodiment is an analog to digital converter ( A / D ) between the voltage divider 17 and microprocessor 9 or board interposed. The analog to digital converter can also be arranged on the board.

3 additionally shows a signal line 33 between the board and a temperature sensor 13 in the immediate vicinity of the energy converter 3 located. The temperature sensor 13 can be used to form a predictive expectation regarding the amount of energy E _{L, A, H} by an actuation of the energy converter 3 is produced.

4 shows an exemplary voltage curve at the capacitor 5 , The voltage V at time 0 on the capacitor 5 corresponds to the voltage after the energy converter 3 is pressed once is given. During an initialization or sleep phase φ1 takes the tension V on the capacitor 5 with time Z off. Respectively, power is from the microprocessor 9 pulled and the amount of energy E _T in the condenser 9 is reduced by this. If necessary, there will be a certain waiting time afterwards W1 shown. In this time, the tension decreases V on the capacitor 5 or the amount of energy E _T comparatively slowly. This decreasing energy can be caused for example by a leakage current. After the wait W1 the system is woken up or a second initialization phase φ1 can be done. Subsequently, a telegram or data packet from the radio electronics 7 sent out. In these times S1 takes the tension V on the capacitor 5 comparatively rapidly, since the transmission of radio signals consumes a lot of energy. The amount of energy E _T on the capacitor 5 can be scanned consistently, but can also be checked several times during the entire transmission process.

In 4 As a result of the transmission, a second optional waiting time W2 is displayed. The waiting times W1 For example, W2, W3 may be required as part of a Listen Before Talk (LBT) process. LBT methods are prescribed for use of certain frequencies in certain regions.

Subsequently, a second message or telegram or data packet is sent out. The second message may be a repeat of the first message. Thus, the reliability of the communication process can be increased. This cycle of waiting W1 , W2, W3 and transmissions S1 , S2, S3 can be repeated until the energy E _T in the storage unit 5 is consumed. The energy in the storage unit 5 can be regular during, for example, the waiting times W1 , W2, W3 are determined. Shown are three sampling times T1 , T2, T3

5 shows a process flow according to an embodiment of the invention. In a first step 100, ambient energy and / or kinetic energy is converted from a mechanical actuation into electrical energy. In a second step 200, the electrical energy E _T in a storage unit 5 saved. In a third step 300, a processor unit 9 a radio unit 7 initialized. In a fourth step 400, a data packet is prepared. In a fifth step 500 becomes an energy amount E _T that is currently in the storage unit 5 is available, determined and / or approximated. In a sixth step 600, a Transmission power of the radio unit 7 based on the amount of energy E _T set. In a seventh step 700, the data packet from the radio unit 7 Posted.

LIST OF REFERENCE NUMBERS

1

contraption

3

energy converters

5

storage unit

7

Broadcast

9

processor unit

13

temperature sensor

15

circuit

17

voltage divider

19

rectifier

21

transmitter

23

DC converter

25

antenna

27

push-button

29

casing

31

voltage line

33

signal line

A / D

analog to digital converter

E _T

Energy up to date

E ₀

minimum energy

E _{L, A, H}

Course of the expected lowest / average / highest energy

T1,2,3

sample times

φ1, φ2

initialization

W1,2,3

waiting times

S1,2,3

transmission times

V

Voltage at the capacitor

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2002/0190610 A1 [0007, 0008]

Claims (10)

Device (1) having - an energy converter (3) which serves to convert energy from the environment of the device (1) and / or from a mechanical actuation of the device (1) into electrical energy - a storage unit (5) serving therefor storing electrical energy; and -a radio unit (7) for receiving and / or transmitting radio signals, the radio unit (7) using the electrical energy of the memory unit (5), in particular to transmit radio signals, and wherein the radio unit (7) has a processor unit (9) which serves to prepare a data packet to be transmitted as a radio signal and to set a transmission power of the radio unit, characterized in that the device (1) is configured to have an energy amount currently stored in the memory unit (5 ) is available to determine and / or approximate, and that the processor unit (9) is adapted to the transmission power of the radio unit (7) based on the determined and / or to set the approximated energy amount. Device after Claim 1 , characterized in that the device (1) has a temperature sensor (13), and that the device (1) is _adapted to approximate the currently available amount of energy based on an ambient temperature (T _EXT ) determined by the temperature sensor (13). Device (1) according to Claim 1 or 2 , characterized in that the device (1) has a circuit (15) which serves to determine the currently available in the memory unit (5) available energy amount (E _T ). Device (1) according to at least one of the preceding claims, characterized in that the processor unit (9) sets the transmission power such that the radio unit (7) transmits the determined energy amount (E _T ) when transmitting a data packet, in particular at least 50%, advantageously to 90%, very advantageously to 98%, and especially very advantageously essentially complete. Device (1) according to at least one of the preceding claims, characterized in that the circuit (15) comprises a voltage divider (17) and an A / D converter (A / D), wherein the A / D converter is designed to sampling the voltage divider (17) in order to determine a voltage formed in the memory unit (5) and to provide it as a digital voltage value of the processor unit (9), or in that the circuit (15) has a voltage divider (17) and in that the processor unit (9) an A / D converter (A / D), wherein the A / D converter (A / D) samples the voltage divider (17) so as to determine a voltage formed in the memory unit (5) and as a digital voltage value in to provide the processor unit (9). Device (1) according to at least one of the preceding claims, characterized in that the processor unit (9) is designed to form a characteristic which has a functional relationship between the energy consumption of the radio unit (7) per transmitted data packet as a function of the transmission power of the radio unit (7), and in that the processor unit (9) selects a transmission power which can be read out from the characteristic curve when setting the transmission power, in which the energy consumption for a data packet substantially corresponds to the energy amount of the memory unit (5). Device (1) according to at least one of the preceding claims, characterized in that the processor unit (9) is _adapted to form the characteristic curve on the basis of the currently provided by the temperature sensor (13) temperature _value (T _EXT ). Device (1) according to at least one of the preceding claims, characterized in that the device (1) has a data storage unit, and that a table is stored in the data storage unit, and that the processor unit (9) is designed to the basis of the determined energy amount (E _T ) one in the table the energy amount (E _T ) associated transmit power read and set for the radio unit (7). Device (1) according to at least one of the preceding claims, characterized in that the device (1) is designed to approximate the currently available energy amount (E _T ) based on the ambient temperature (T _EXT ), in which the device (1) Standard value calculated, the guide value depending on the expected electrical energy (E _{L, A, H} ), which is to be expected by a mechanical actuation of the device at the measured ambient temperature (T _EXT ), is given. Method comprising the following steps: ambient energy and / or kinetic energy from a mechanical actuation is converted by a device (1) into electrical energy; - The electrical energy is stored in a memory unit (5); - A processor unit (9) of a radio unit (7) is initialized; - a data packet is processed; an energy amount (E _T ) which is currently available in the memory unit (5) is determined and / or approximated; - a transmission power of the radio unit (7) is set on the basis of the energy amount (E _T ), the data packet is transmitted by the radio unit (7).

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