GSM/GPRS WiFi Module A20 IoT camera

GSM/GPRS WiFi Module A20 IoT camera

GSM/GPRS WiFi Module A20 IoT camera

Description

A20 is a wireless module that combine GPRS and WiFi, also it supports camera connection. It uses ESPRESSIF’s WiFi IC ESP8285 for the WiFi function.
A20’s GPRS module and WiFi module can work separately, be powered separately. This is a good solution for your IoT device to connect internet all the time no matter where it is.
You can choose the following working model to suit your project:

  • Only GPRS. For this model, only provide power for GPRS part, then use MCU to control the GPRS by serial port.
  • Only WiFi. Just like the only GPRS, only provide power for WiFi part, use MCU to control WiFi by serial port.
  • WiFi and GPRS. Use 2 serial port to control WiFi and GPRS separately.
  • WiFi as MCU to control GPRS. Under this model, you can use WiFi IC ESP8285 as MCU to control GPRS. Because there is only one two-way serial port, so user need to program ESP8285.

Pin map


Pin Number

Pin name

Explanation

1

CAM_Y1

Camera data Y1

2

CAM_Y2

Camera data Y2

3

CAM_Y3

Camera data Y3

4

CAM_Y4

Camera data Y4

5

CAM_Y5

Camera data Y5

6

CAM_Y6

Camera data Y6

7

CAM_Y7

Camera data Y7

8

PWR_KEY

Power, keep >1.9V for 2 secs the camera will power on, after that keep it on or off, the camera will continue, this pin only requires voltage, no need real power supply.

9

CAM_VSYNC

Camera VSync pin

10

CAM_Y0

Camera data pin Y0

11

CAM_PCLK

Camera PCLK

12

CAM_CLK

Camera clock

13

CAM_HREF

Camera href

14

SIM_RST

Sim card RST

15

SIM_CLK

SIM Card clock pin

16

VSIM

SIM power VCC

17

SIM_DATA

SIM data

18

WF_IO5

ESP8285 GPIO5

19

VDD3V3

ESP8285 3.3V main power

20

WF_RST

ESP8285 reset

21

WF_RF

ESP8285 RF

22

WF_TXD

ESP8285 UART0 TXD

23

WF_RXD

ESP8285 UART0 RXD

24

WF_IO12

ESP8285 GPIO12

25

WF_IO13

ESP8285 GPIO13

26

WF_IO15

ESP8285 GPIO15

27

WF_IO2

ESP8285 GPIO2

28

WF_IO0

ESP8285 GPIO0

29

WF_IO4

ESP8285 GPIO4

30

I2C_SDA

Camera IC I2C DATA

31

I2C_SCL

Camera IC I2C CLOCK

32

VDD_1V8_OUT

OUTPUT 1.8V, can connect to camera IC 1.8V

33

UART_RXD

AT serial port RXD, 2.8V

34

UART_TXD

AT serial port TXD, 2.8V

35

GPIO1/SLEEP

Control sleep model, high level off, low level on. Under sleep model, current<1mA, and serial port is unavailable. Phone call, SMS, GPRS can wake the module from sleep model.

36

HST_TXD

Download serial port TXD, 2.8V

37

HST_RXD

Download serial port RXD, 2.8V

38

FLASH_EN

Flash light control pin, normally need additional amplifier circuit to power the LED light.

39

GSM_RF

GSM RF antenna pin, it requires 50 Ohm impedance when you design PCB

40

GPIO3

Normal GPIO pin, when there is call, SMS, GPRS data in, the module will automatically awake, this pin will output single, from high level to low level, falling edge trigger.

41

CAM_PDN

Camera power down

42

V_CAM

Camera main power

43

CAM_RST

Camera reset

44

GND

GND

45

VBAT

Outside power in 3.5v-4.2v, the power supply’s maximum output current must higher than 2A, otherwise the module cannot work stably. This pin also relates to some GPRS/GSM VCC.

46

VBAT


Tips:

  1. The camera port only support 0.3M pixel fix-focus camera. Support IC including OV7670, GC0328, GC0309. If you want to use other camera, you can contact us or the manufacturer for software support.
  2. In the pin list, the red font pins are all for WiFi, the rest is all for GPRS.
  3. GPRS At serial port default speed is 115200.

Datasheet

A20 datasheet EN.pdf

esp8285_datasheet_en_v1.0_20160422.pdf

A6_A7_A6C_A20 AT Command V1.03.pdf


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  • Product Code: 101781
  • Availability: In Stock
  • $15.90
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Tags: GSM/GPRS, WiFi, A20, IoT camera