This is an Arduino PlatformIO project for ESP32 boards. The ESP32 is connected to a MQTT broker over your local WiFi on one hand and to an EasyDrv8833 via I2C on the other. It subscribes to certain MQTT topics and reacts to messages on these topics as if a command was sent to the ESP32. It then forwards these commands to the EasyDrv8833 over I2C. This makes it possible to control the driver by just sending messages to the MQTT broker and has been my principal testing platform when developing the EasyDrv8833.
Currently the following commands are implemented:
- easydrv/power [off/on]
- easydrv/state nstate (1 uint8 value)
- easydrv/duty12 nduty1 nduty2 (2 unit8 values)
- easydrv/pidpars Kp Ki Kd (3 float values)
- easydrv/setmode nset1 nset2 nmode (3 integer values, nmode is unit8)
- easydrv/resetpos npos1 npos2 (2 integer values)
The program also continuously reads the encoder state of the driver over I2C and publishes
the received data to the topic easydrv/encall on the MQTT broker.
The web interface plots these values as a time series using uplot.
You'll need access to a MQTT broker somewhere, I use a local install of mosquitto. If you
you want to use the web interface, the broker must have websockets enabled, you can use
a configuration file similar to the following example for the current version of mosquitto
pid_file /var/run/mosquitto.pid
port 1883
protocol mqtt
listener 9001
protocol websockets
persistence true
persistence_location /var/lib/mosquitto/
log_dest file /var/log/mosquitto/mosquitto.log
include_dir /etc/mosquitto/conf.d
For the time being no authentication is used.
The web directory contains a simple web interface to the MQTT broker. Edit index.html and set
the variable MQTTbroker if your MQTT broker is not running on localhost. The open index.html
in your browser. You can send commands to the EasyDrv8833 by entering the desired parameter
values in the form and then pressing the desired button. Encoder values are plotted as a
time series.
I am using a EzSBC board, but the code should be easy to adapt to other boards. The EzSBC board
has a RGB LED connected to pins 16,17 and 18. You have to change functions led_on, led_off and
setup (defines the pins) in this case.
When compiling the code you have to make sure VS Code can see the following environment variables, these are injected dynamically into the code.
export WIFI_SSID=YourWiFiSSID
export WIFI_PASSWORD=YourWifiPassword
export MQTT_BROKER=MqttBrokerIP
Don't forget to adjust port settings in platformio.ini.
This program is BSD-3 licensed, see source code.