Revision History:

• As of February 13, 2025 - We've updated this design to add a built-in level shifter so it will work flawlessly with 3V or 5V NeoPixel signals.

STEMMA JST PH

• STEMMA JST PH - 2mm pitch STEMMA JST port for use with 3-pin STEMMA JST PH cables. It has connections for:
  • GND - common ground for power and data. It is the black wire on the JST PH cable.
  • VIN - power input for the RGB LED(s). It is the red wire on the JST PH cable. You can use 3-16VDC. Use the voltage that matches the requirements for your RGB LEDs (ex: 12V for a 12V strip). The JST PH connector is rated for 2A input. If you are using more than 2A of current total across all 3 RGB channels then you need to use the VIN input on terminal block.
  • SIG/Neo In - NeoPixel-compatible signal from your microcontroller, 3 or 5V logic. It is the white wire on the JST PH cable.

Terminal Block

• GND - common ground for power and data.
• VIN - power input for the RGB LED(s). You can use 3-16VDC. Use the voltage that matches the requirements for your RGB LEDs (ex: 12V for a 12V strip). If you are using more than 2A of current total across all 3 RGB channels, you'll need to wire the power supply to this input.
• RED - red channel output from the WS2811. Connect to the red channel input on your RGB LED strip.
• GRN - green channel output from the WS2811. Connect to the green channel input on your RGB LED strip.
• BLU - blue channel output from the WS2811. Connect to the blue channel input on your RGB LED strip.

NeoPixel Signal Input and Output Pins

On the edges of the board are pins for Neo In and Neo Out. These pins allow you to connect multiple NeoRGB Stemma boards together.

• Neo In - NeoPixel-compatible signal from your microcontroller, 3 or 5V logic.
• Neo Out - output of the NeoPixel-compatible signal from your microcontroller

Signal LED and Jumper

• Signal LED - to the left of the JST PH connector is the signal LED, labeled SIG. It is the red LED. It will lightly blink when data is sent on the Neo In/Signal line.
• LED jumper - in the upper left corner on the back of the board is a jumper for the signal LED. If you want to disable the signal LED, cut the trace on this jumper.

Power LED and Jumper

• Power LED - to the right of the JST PH connector is the power LED, labeled ON. It is the green LED.
• LED jumper - in the upper right corner on the back of the board is a jumper for the power LED. It is labeled LED on the board silk. If you want to disable the power LED, cut the trace on this jumper.