CN201207702Y - Wireless low-power consumption remote monitoring camera device for home security protection - Google Patents

Abstract

Disclosed is a wireless remote monitoring photographic device with low power consumption, which is applied to home security and belongs to the field of a home security system, and the photographic device is characterized in that: the device comprises a digital image sensor, an image encoding chip, a controlling singlechip, a wireless communication module, a power module and a residential gateway; the controlling singlechip is connected with the digital image sensor, the image encoding chip and the wireless communication module through a bus. In the state of dormancy, the controlling singlechip sends out a dormant instruction to each component through the bus to close the external crystal oscillation and retain a watchdog function block; at intervals of the setting period, the function block judges whether the residential gateway sends out a start command through the wireless communication module and informs the digital image sensor to capture images immediately after the reception of the start command, the images are delivered to the controlling singlechip after being compressed and sent to the residential gateway through the wireless communication module. The device has the advantages of low power consumption and realizable remote monitoring.

Description

A kind of wireless low-power consumption remote monitoring camera that is used for family's security protection

Affiliated field

The utility model belongs to family safety-protection system field, and particularly monitor camera device is wherein realized family's safety-protection system in order to cooperate home gateway.

Background technology

The purpose of this utility model provides a kind of novel wireless monitoring device, towards low-end market, providing wireless camera watch-dog a kind of low-power consumption, that need not online power supply under the situation cheaply, satisfies the demand of ordinary consumption family.

Jue Dabufen watch-dog in the market, it no matter is wired or wireless device, mostly be that monitor terminal transmits monitoring image by ICP/IP protocol on Ethernet, WLAN or Internet, the consequence that so causes be the cost of equipment than higher, power supply power consumption is big, the installation wiring trouble, even wireless device, because power consumption is big, still there is the wiring problem of power line, give to install and use and brought trouble.The utility model is exactly a solution that proposes for the problem that solves this respect, after realization and intelligent home network wireless connections, just can provide complete monitoring function, have cost low, low in energy consumption, need not advantages such as wiring, easy for installation, battery altering cycle be long.

China Patent No. 200510018204.9 has been announced a kind of household intelligent digital monitoring system based on WLAN (wireless local area network), this system has realized collection, transmission, compression, encryption and the storage of data image signal based on WLAN, can will monitor picture or monitoring video information reaches mobile phone or PDA user terminal by ADSL or GPRS/CDMA simultaneously.But this system does not realize the design of low-power consumption, because the power consumption of WLAN transceiver is bigger, must provide online power supply, has brought inconvenience for the installation of equipment; China Patent No. 02155519.2 has been announced a kind of digital camera with wireless internet function, has realized IMAQ and transmission based on WLAN; China Patent No. 02153943.X has announced a kind of wireless digital camera head and method, has realized transmitting multi-medium data by mobile communications network or wireless Internet to other data processing equipments of far-end; China Patent No. 200510088916.8 announced a kind of wireless camera, solved between camera and the graphic display terminal defective that must be connected with connecting line; China Patent No. 03178525.5 has been announced a kind of wireless image method for supervising and system, has realized picture control to moving target and fixed target by mobile radio communication; China Patent No. 200510114228.4 has been announced a kind of wired and wireless two-in-one camera; China Patent No. 03121934.9 and 03124212.X have respectively announced a kind of remote wireless monitoring system and method thereof.Yet the problem of low power dissipation design is not all considered or relate to above these patents, and watch-dog must connect online power supply can operate as normal, this at the average family security protection use and popularization has brought great inconvenience.China Patent No. 02283688.8 has been announced a kind of wireless camera that enters low power consumpting state, can need not power-supply wiring, but the deficiency of this device points out it is middle can waking up by the transducer of this locality, lacks user's Remote Wake Up function, makes the user can't initiatively carry out remote monitoring.

Summary of the invention

The purpose of this utility model is in order to overcome the above problems, and design realizes succinct, the security monitoring device that is easy to promote easy for installation under the average family environment.The utility model is based on the wireless transmission scheme of picture coding scheme and the 2.4GHz of Motion-JPEG, adopted the system configuration of " digital image sensor+image encoding chip+control single chip computer+wireless communication module+home gateway ", technology such as comprehensive multimedia processing, digital home network, wireless telecommunications, low power dissipation design, realized the video monitoring of ordinary consumption family quickly and easily, for home security monitoring has proposed new design and application model.

Contain: digital image sensor, the image encoding chip, control single chip computer, wireless communication module, power module and home gateway, wherein:

Digital image sensor adopts chip OV7670, is used for converting the signal of telecommunication to collect light signal, and exports with PAL colour television standard chrominance component form YUV.

The image encoding chip adopts chip VC0528, and it imports to such an extent that link to each other with the output of the described PAL colour television standard chrominance component form YUV of described digital image sensor, and the output of this chip VC0528 obtains exporting the image of jpeg format.

Control single chip computer adopts AVR single chip computer AT mega64, and described single-chip microcomputer links to each other through the output bus of bus with described digital image coding chip, and links to each other with wireless communication module through the SPI interface.

Wireless communication module adopts chip nRF24L01, passes through the SPI interface operation by described control single chip computer.

Power module adopts HT7733, HT7730 and LM1117 chip, to described digital image sensor, image encoding chip, control single chip computer and wireless communication module power supply.

Described control single chip computer is realized remote monitoring function according to following steps successively:

Step (1) resting state: send the dormancy instruction to described digital image sensor, image encoding chip and wireless communication module respectively, make it be in low power consumpting state, close external crystal-controlled oscillation simultaneously, make and oneself enter resting state, it is fast only to move inner house dog WatchDog function;

Step (2): behind the setting cycle through the WatchDog functional block, wake single-chip microcomputer and described wireless communication module up, and to a startup of home gateway wireless transmission request data package, this home gateway returns starting command when judgement need be carried out monitoring camera, this control single chip computer is after receiving starting command, wake the above-mentioned module that is connected up by bus and enter into operating state, otherwise keep resting state;

Step (3): in the time-count cycle of setting, described digital image sensor photographic images and via behind image encoding chip, control single chip computer and the wireless communication module view data being wirelessly transmitted to home gateway, after arriving time-count cycle, control single chip computer enters resting state again.

By above design, the utility model can reach low-power consumption effect preferably.Can see from following table, under the entire circuit operating state total current less than 100mA, than in the market the overwhelming majority the product power consumption much lower.Because entire circuit is in holding state at ordinary times, i.e. park mode, the electric current when therefore not working at ordinary times be less than 80uA, calculates according to the lithium battery of 2 ampere-hours, at most can standby more than 800 day, and sustainable work is more than 1 day under the operating state.Because this utility model is used for family's safety-protection system, is in holding state at ordinary times substantially, and is greatly convenient for users to use so in general the battery of this equipment can continue to use more than half a year, reduced the replacing number of times of battery.Owing to thoroughly saved the trouble of wiring, the domestic household that the utility model makes average family fit up especially can be disposed home security monitoring equipment easily, has reduced the threshold that the digital video monitoring product is promoted to the ordinary consumption user when bringing convenience to the user significantly.

The chip model	Dormancy power consumption	The normal condition power consumption
			OV7670	20uA	20mA
VC0528	20uA	25mA
			ATmega64.	25uA	20mA
nRF24L01	0.9uA	20mA
			Other	5uA	10mA
Total power consumption	<80uA	<100mA

Description of drawings

Fig. 1 is the operating state transformational relation figure of the utility model device.

Fig. 2 is the circuit theory diagrams a (ATmega64 peripheral circuit) of the utility model device.

Fig. 3 is the circuit theory diagrams b (VC0528 peripheral circuit) of the utility model device.

Fig. 4 is the circuit theory diagrams c (OV7670 and power module peripheral circuit) of the utility model device.

Fig. 5 is the circuit theory diagrams d (wireless module interface circuit) of the utility model device.

Fig. 6 is the wireless module circuit theory diagrams of the utility model device.

Fig. 7 is the integrated circuit structured flowchart of the utility model device.

Embodiment

The utility model hardware circuit mainly comprises 3 aspects, IMAQ and coding circuit module, control circuit module, wireless radio frequency modules and power module.The operation of whole hardware components is controlled by control circuit, comprise initialization, the image of system acquisition controlling, image wireless transmission control, system hibernates and wake up etc.

IMAQ and coding circuit module are divided into imageing sensor and image compression module two parts, that imageing sensor adopts is OV7670, that image compression chip adopts is the VC0528 that Vimicro company provides, imageing sensor converts the light signal that collects to the signal of telecommunication and passes to image compression chip with the picture format of YUV and compress, thus the image of output jpeg format.

Control chip mainly adopts AVR single chip computer AT mega64 in the control circuit module, and the advantage of this chip is that cost is low, and power consumption is few, have multiple interfaces such as bus, SPI, serial ports, the speed of service is fast, one-cycle instruction, can under park mode, move WatchDog etc., meet demand of the present utility model.The AVR single-chip microcomputer links to each other with VC0528 by bus, by the configuration mode of operation of VC0528 and image parameter etc., can carry out IMAQ easily; Be connected with radio frequency chip nRF24L01 by the SPI interface simultaneously, very the aspect passes through operating state and the images that this interface disposes wireless module.

The chip that wireless radio frequency modules adopts is nRF24L01, and the maximum transmission rate of this chip can reach 2Mbps, and wireless frequency is 2.4GHz, does not adopt ICP/IP protocol, and communication protocol is simple.

The chip that power module adopts comprises HT7733, HT7730 and three kinds of chips of LM1117 (1.8V), and the system of being respectively provides 3.3V, 3.0V, three kinds of operating voltages of 1.8V.

For the radio communication and the low-power consumption problem that solve video monitoring equipment, the utility model has adopted following low power dissipation design scheme:

At first, operating state is divided into 3 kinds: resting state, WD wake-up states and operating state.

1) resting state: single chip machine controlling circuit sends the dormancy instruction for respectively IMAQ and coding module and wireless radio frequency modules, make it be in the super low-power consumption state, close outside 26MHz crystal oscillator simultaneously, and oneself also enters resting state, only move inner WatchDog functional block, so that can revive automatically, thereby enter the WD wake-up states.

2) cycle of WD wake-up states: WD (WatchDog) is about 2S, promptly the every approximately 2S of single-chip microcomputer will wake up once automatically under this state, this moment, single-chip microcomputer was with the wake on wireless radio-frequency module, and to a startup of home gateway transmission requested packets, home gateway receive this packet after can judge whether to start the monitoring camera-shooting photographic images according to the detection case or the user's request of transducer, and reply this request.Single-chip microcomputer is if received starting command, and then all modules of wake-up circuit enter into operating state at once, if received continuation dormancy instruction, then enters the resting state wait and wakes up automatically next time.

3) operating state: single chip machine controlling circuit wakes all circuit modules up, after the configuration of being correlated with, can enter operating state photographic images and transmit image data to family's gateway.Internal circuit timing simultaneously 5 minutes, the time to after quit work and enter resting state.

Secondly, wireless in order thoroughly to accomplish on supply power mode, make things convenient for the user installation camera, the problem such as not attractive in appearance of exempting the wiring trouble and causing, the utility model adopts powered battery, can use jumbo lithium battery (more than 2 ampere-hours) power supply.Only need the battery case that can place corresponding size be installed on circuit board and get final product, save cable power.

As shown in Figure 1, concrete function of the present utility model is as follows: after 1) the device installation starts, enter park mode automatically, the WatchDog of single-chip microcomputer enters time status simultaneously, just gets the hang of 2 after the timing overtime (about 2S); 2) when WatchDog overtime, single-chip microcomputer can be waken up operation, this moment, single-chip microcomputer at first started radio frequency chip, send startup to home gateway and take request, home gateway can judge whether to start the monitoring camera-shooting photographic images according to the detection case of 315 transducers after receiving this request, and replys this request.Single-chip microcomputer is if received starting command, and then all modules of wake-up circuit enter into state 3 at once, if received continuation dormancy instruction, then return state 1 wait wakes up next time automatically; 3) single chip machine controlling circuit wakes all circuit modules up, after the configuration of being correlated with, can enter operating state shooting and images to family's gateway.Internal circuit timing simultaneously 5 minutes, the time to after quit work and get the hang of 1.It more than is whole workflow of the present utility model.

As Fig. 2,3, shown in 4, monitor camera device, comprise IMAQ and coding circuit module, control circuit module, wireless radio frequency modules and power module, what wherein IMAQ and coding circuit module adopted respectively is that model is that OV7670 (imageing sensor) and model are VC0528 (image compression chip, operating frequency is 26MHz) chip, it is the single-chip microcomputer of Atmega64 (operating frequency is 9.216MHz) that control circuit module mainly adopts model, what wireless radio frequency modules mainly adopted is that model is the chip of nRF24L01, the chip that power module adopts comprises that model is HT7733, three kinds of chips of HT7730 and LM1117 (1.8V), the peripheral circuit of all chips all adopt the reference circuit design of this chip.OV7670 is directly controlled according to the mode of image sensor interface definition by VC0528; The main chip of control circuit is Atmega64, link to each other with the bus of VC0528 by bus PA0 ~ PA7, PC4 ~ PC7, PG0 and PG1, wherein PA0 ~ PA7 is data and address multiplex bus, and other are associated control signal (PC7 order gate inverter SN74AHC1G04DBVR wherein); SPI interface and the PE6 of Atmega64 by single-chip microcomputer links to each other with nRF24L01 with PE7 and controls radio frequency chip.

As shown in Figure 5, radio communication function is realized that by chip nRF24L01 wherein chip configuration work is passed through the SPI interface operation by Atmega64.NRF24L01 is the high speed that provided by Nordic company, low-power consumption, radio transmitting and receiving chip cheaply, and the MultiCeiver of its original creation can support the reception of 6 wireless devices simultaneously.Simultaneously nRF24L01 is particularly suitable for adopting the product of the 2.4GHz of button cell power supply to use, its carrier wave measuring ability can be used for the reliable communication under the WLAN environment, have reduced two-forty and unique switching time and possibility of collision occurred, therefore be fit to very much be applied in the native system with frequency-hopping system such as bluetooth.By preceding described, adopt the gateway of native system can support 6 independently Data Receiving of wireless camera at most simultaneously, can satisfy the demand of average family inside substantially.

Claims (1)

1. be applied to the wireless low-power consumption remote monitoring camera of family's security protection, it is characterized in that, contain: digital image sensor, the image encoding chip, control single chip computer, wireless communication module, power module and home gateway, wherein:

Digital image sensor adopts chip OV7670, is used for converting the signal of telecommunication to collect light signal, and exports with PAL colour television standard chrominance component form YUV;

The image encoding chip adopts chip VC0528, and its input links to each other with the output of the described PAL colour television standard chrominance component form YUV of described digital image sensor, and the output of this chip VC0528 obtains exporting the image of jpeg format;

Control single chip computer adopts AVR single chip computer AT mega64, and described single-chip microcomputer links to each other through the output bus of bus with described digital image coding chip, and links to each other with wireless communication module through the SPI interface;

Wireless communication module adopts chip nRF24L01, passes through the SPI interface operation by described control single chip computer;

Power module adopts HT7733, HT7730 and LM1117 chip, to described digital image sensor, image encoding chip, control single chip computer and wireless communication module power supply.

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