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3. Wiring
Chris edited this page Oct 20, 2025
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CONNECTOR PINS for DISPLAY/MULTIPLEXER
- Lolin D32 ESP32 SCL 22, SDA 21
- Lolin D32 Pro ESP32 SCL 22, SDA 21
- Wemos D1 mini ESP8266 SCL D1, SDA D2


CONNECTOR PINS for DISPLAY/MULTIPLEXER
- Lolin D32 ESP32 SCL 22, SDA 21
- Lolin D32 Pro ESP32 SCL 22, SDA 21
- Wemos D1 mini ESP8266 SCL D1, SDA D2
See Wiki / 6. Configuration for software configuration

Wiring for ESP32 Lolin D32 controller, the same setup also works with ESP8266 controllers.
CONNECTOR PINS for DISPLAY/MULTIPLEXER
- Lolin D32 ESP32 SCL 22, SDA 21
- Lolin D32 Pro ESP32 SCL 22, SDA 21
- Wemos D1 mini ESP8266 SCL D1, SDA D2
This setup is for the 2x and 4x OLED Adaptors for 0.87" 128x32 displays from this project: MobaLedLib 0.87" OLED-Adapter.

As the voltage regulator and reset electronic are missing on the adaptor pcb, the following components need to be added to the wiring.
- 1 Voltage Regulator 3.3V 1A, LD1117, AMS1117, ...
- 1 Schottky Diode 1N5817
- 1 Electrolytic Capacitor 4.7µF 20V
- 1 Electrolytic Capacitor 10µF 20V
- 10 Resistor 4.7kΩ
- OLED Adaptor 2x or 4x
- OLED displays 0.87" 128x32
JR and JS connection on the adaptor PCBs must be closed.
NOT tested with the latest version! The LT version will NOT be enhanced anymore, the functionality is included in the main project Roc-MQTT-Display now!

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