/esp-idf-mqtt-camera

Take a picture and Publish it via MQTT

Primary LanguageC

esp-idf-mqtt-camera

Take a picture and Publish it via MQTT.
This project use ESP32 Camera Driver.

slide0001 slide0002

Hardware requirements

ESP32-CAM Development board.
Support for OV2640 camera.
If you use other camera, edit sdkconfig.default.
ESP32-CAM-1 ESP32-CAM-2

Software requirements

esp-idf v4.4 or later.

Installation

Use a USB-TTL converter.

ESP-32 USB-TTL
U0TXD RXD
U0RXD TXD
GPIO0 GND
5V 5V
GND GND 
git clone https://github.com/nopnop2002/esp-idf-mqtt-camera
cd esp-idf-mqtt-camera
git clone https://github.com/espressif/esp32-camera components/esp32-camera
idf.py set-target esp32
idf.py menuconfig
idf.py flash monitor

Start firmware

Change GPIO0 to open and press the RESET button.

Configuration

Set the following items using menuconfig.

config-main config-app

Wifi Setting

config-wifi

MQTT Server Setting

config-mqtt

Select Frame Size

Large frame sizes take longer to take a picture.

config-framesize-1 config-framesize-2

Select Shutter

You can choose one of the following shutter methods

  • Shutter is the Enter key on the keyboard
    For operation check

config-shutter-1

  • Shutter is a GPIO toggle

    • Initial Sate is PULLDOWN
      The shutter is prepared when it is turned from OFF to ON, and a picture is taken when it is turned from ON to OFF.

    • Initial Sate is PULLUP
      The shutter is prepared when it is turned from ON to OFF, and a picture is taken when it is turned from OFF to ON.

I confirmed that the following GPIO can be used.

GPIO PullDown PullUp
GPIO12 OK NG
GPIO13 OK OK
GPIO14 OK OK
GPIO15 OK OK
GPIO16 NG NG

config-shutter-2

  • Shutter is MQTT Publish
    You can use pub.py.
    Please change the following according to your environment.
# MQTT Broker
host = 'broker.emqx.io'
# MQTT Port
port = 1883
# MQTT Publish Topic
topic = '/topic/picture/sub'

config-shutter-3

Flash Light

ESP32-CAM by AI-Thinker have flash light on GPIO4.

config-flash

How to save picture file using python

You can use saveFile.py.
Please change the following according to your environment.

# MQTT Broker
host = 'broker.emqx.io'
# MQTT Subscribe Topic
topic = 'image/#'
# Save File
saveFile = './output.jpg'

How to save picture file using node.js

You can use saveFile.js.
Please change the following according to your environment.

// MQTT Broker
host = 'mqtt://broker.emqx.io'
// MQTT Subscribe Topic
topic = 'image/#';
// Save File
saveFile = './output.jpg'

Built-in WEB Server

You can check the photos taken using the built-in WEB server.
Enter the ESP32's IP address and port number in the address bar of your browser.

browser

MQTT client Example

Example code in various languages.
https://github.com/emqx/MQTT-Client-Examples

References

https://github.com/nopnop2002/esp-idf-mqtt-broker

https://github.com/nopnop2002/esp-idf-mqtt-image-viewer