PAX Counter

This device scans for visible bluetooth and wifi devices and then transmits the device count over NBIoT to a backend server.

Tested on a ESP-WROOM-32D + EE-NBIoT-01 rat's nest ;)

Wiring (ESP):

• VCC 3.3V
• EN to VCC via 10k pull-up
• IO0 to GND via boot switch (enable programming mode by grounding IO0 before power-on)
• GND
• IO16 to EE-NBIoT-01 RXD
• IO17 to EE-NBIoT-01 TXD
• RXD0 a) to FTDI TX and b) to GND via 10k pull-down
• TXD0 to FTDI RX

1. Use common ground for ESP-WROOM-32D, EE-NBIoT-01 and FTDI.
2. Leave FTDI VCC pin unconnected