OpenBCI WiFi Shield DIY

Here is how I built my own WiFi shield for the OpenBCI Cyton and Ganglion boards. The total cost was less than €10.

See the schematic.

• 1 ESP8266-12 module
• 1 ESP8266-12 adapter
• 2 push buttons
• 3 blue LEDs
• 1 NCP1117 voltage regulator
• 1 JST connector
• some resistors and capacitors
• pin headers and a piece of Veroboard

On the white adapter board, I first removed the 0K resistor link in the middle (R2). Then I cut the two tracks that run from VCC to the left-hand side 10K resistor (R3). Next, I soldered on an NCP1117 on the backside (not visible in the photo) and finally added two 100nF caps.

Last I mounted the ESP+adapter on a Vero board, added male pin headers and the other components and wires.

ESP8266-12 module on proto board

Cyton board with DIY WiFi shield

It looks very rough but works great. Here are instructions on how to upload firmware and how to use it.