The 12th pin was connected to the data pin of the transmitter module. You can refer to the image below for a clearer view of the circuit connections and placement in the helmet. All the modules are ...

GUITION JC1060P470C is an ESP32-P4 board with an integrated 7-inch touchscreen display and an ESP32-C6 WiFi 6 and Bluetooth 5 module providing wireless connectivity ... but I’m more surprised about ...