I recently started playing with ESPHome again, a very powerful firmware generator for ESP8266/ESP32 IOT modules. I’ve been creating a control panel for my Chinese laser-cutting machine to display coolant temperatures and control the speed of the fume extractor. It’s based on a RobotDyn IOT AC dimmer which has an integrated power supply and uses a Wemos D1 Mini-compatible module with an ESP8266.
At the moment, the module has the following additional peripherals attached:
- 2 waterproof Dallas 18B20 1-wire temperature sensors
- MCP23017 I/O expander
- 3 TM1637 0.56″ 4-digit 7-segment LED displays
I had a DYIMore 2.42″ 128×64 pixel OLED display lying around from a previous project (DYI OpenTX transmitter), so I thought it might be nice to have a larger display as well.
And finally to the point of this post. The display supposedly uses the SSD1309 driver – it’s listed as such on the product page, and it’s silkscreened on the display itself. SSD1309 is not supported by ESPHome. However, after some googling I found out the display works just fine with the ESPHome SSD1306 driver. I’m running the display over I²C (it also supports SPI, but was configured for I²C by default), so it needs the following connections:
- VCC (+5 V)
- GND (ground, 0 V)
- SDA (I²C data)
- SCL (I²C clock)
- RST (reset)
Here’s the complete relevant snippet from my ESPHome configuration:
i2c: - id: iic sda: D2 scl: D3 scan: true font: - file: "~/.local/share/fonts/monaco.ttf" id: monaco10 size: 10 display: - platform: ssd1306_i2c model: "SSD1306 128x64" reset_pin: D5 address: 0x3C contrast: 50% # Lower the brightness rotation: 180° # I'm using the display upside down update_interval: 60s lambda: |- it.print(0, 0, id(monaco10), "Hello World!");
More about the laser control panel soon :)