| Pin39 || <span style="color:#FFFFFF; background:#000000">0v Ground</span> || <span style="color:#FFFFFF; background:#00aa00">GPIO 21</span> || Pin 40 | | Pin39 || <span style="color:#FFFFFF; background:#000000">0v Ground</span> || <span style="color:#FFFFFF; background:#00aa00">GPIO 21</span> || Pin 40 |