Note that if you touch the back while using this board, you might add some conductivity to it, which can make it think you've pressed the button.

Power Pins

  • VIN - This is the power pin. Since the chip uses 3 VDC, we have included a voltage regulator on board that will take 3-5VDC and safely convert it down. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V microcontroller like Arduino, use 5V.
  • 3Vo - This is the 3.3V output from the voltage regulator. You can grab up to 100mA from this if you like.
  • GND - This is the common ground for power and logic.
If you notice any unusual behavior, especially with multiple encoders, consider hard-wiring a power supply to VIN and GND on the encoder.

I2C Logic Pins

The default I2C address is 0x36.

  • SCL - This is the I2C clock pin. Connect to your microcontroller I2C clock line. This pin is level shifted so you can use 3-5V logic, and there's a 10K pullup on this pin.
  • SDA - This is the I2C data pin. Connect to your microcontroller I2C data line. This pin is level shifted so you can use 3-5V logic, and there's a 10K pullup on this pin.
  • STEMMA QT - These connectors allow you to connect to development boards with STEMMA QT connectors or to other things with various associated accessories.

Other Pins

  • INT - This is the interrupt pin. There is a red INT LED on the back of the board that, if this pin is configured, blinks when the interrupt fires.

Address Jumpers

  • A0/A1/A2 - Using the three onboard address jumpers, you can connect up to 8 of these rotary encoders on a single I2C port. The first one will be at address 0x36, the last one at 0x3D when all three jumpers are soldered closed.

NeoPixel LED

  • Onboard NeoPixel LED - This RGB LED is controlled over I2C using the seesaw library for additional visual feedback or keep it off if you like. It is connected to seesaw pin 6.

This guide was first published on May 11, 2021. It was last updated on 2021-05-21 11:38:35 -0400.

This page (Pinouts) was last updated on May 24, 2022.

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