ESP32-C3 micro board with OLED display
This is very small board based on EPS32-C3 with an 0.42" onboard OLED display and a single NeoPixel.
This board is not supported by Adafruit library. Some small modifications must be made that can be found in https://github.com/mathertel/Adafruit_SSD1306.
This board comes with
- 4MB Flash
- Ceramic WiFi Antenna
- One Neo Pixel/WS2812 LED.
- QWIIC compatible socket for wiring I2c based sensors.
- OLED display based on SSD1306 chip attached through I2C Interface.
- USB-C connector, directly connected to ESP32-C3 processor.
- 5V to 3.3V regulator on board.
WS2812 RGB LED
- This LED is attached to the pin GPIO 2 and can be controlled by using a Neo Element.
{
"neo": {
"bar": {
"pin": "2",
"value": "red",
"count": 1
}
}
}System configuration
This env.json file can be used as a starting point for configuring this board type.
It contains the onboard special hardware initialization for the IO09 button, the OLED display and the neopixel.
{
"device": {
"0": {
"name": "microc3",
"description": "micro esp32c3 with OLED display and Neopixel.",
"loglevel": "2",
"button": "9",
"logfile": 2,
"safemode": "false",
"homepage": "/board.htm",
"cache": "max-age=600",
"i2c-SDA": "5",
"i2c-SCL": "6"
}
},
"ota": {
"0": { }
},
"ntptime": {
"0": {
"zone": "CET-1CEST,M3.5.0,M10.5.0/3"
}
},
"DisplaySSD1306": {
"0": {
"address": "60",
"brightness": "128",
"width": 72,
"height": 40,
"rotation": 0
}
},
"neo": {
"bar": {
"pin": "2",
"value": "red",
"count": 1
}
}
}Device configuration
The config.json file will contain the functionality of the device. This is a minimal configuration that
- displays the current time
- and a digitalin element to support the :
{
"displaytext": {
"time": {
"x": 0,
"y": 0,
"value": "21:08",
"fontsize": 24
}
},
"value" : {
"bright": {
"min": 0,
"max": 100,
"value": 8,
"onvalue": "DisplaySSD1306/0?brightness=$v"
}
},
"time": {
"clock": {
"onminute": "displaytext/time?value=$v"
}
},
"digitalin": {
"9": {
"pin": 9,
"pullup": "true"
}
}
}