Board Features:

Support communicatoin via

BC35G NB IOT low power module

  • Frequency Band: B1 / B3 / B5 / B8 / B20 / B28 (B28 is still developing)
  • Cover many common frequency bands, but please check before order.
  • Communicate via UART3 of STM32
  • Jumper for checking power use.
  • On board extra reserved pins
  • SIM slot on back side of PCB board. RS-232 Port
  • Communicate via UART1 of STM32
  • Jumper for checking power use.

Control by STM32L151 low power microcontroller

  • Jumper for checking power use.
  • PB0 PB1 PB2 PB9 programmable LED
  • PB12 programmable button
  • Reserved UART2 interface.
  • Program SWD port.
  • On board reserved DHT11 temperature sensor port via PA7

On board battery charger controller TP4056

  • Charge via micro USB.
  • Battery read via resistor divider by STM32 chip PA0 pin.
  • All battery protection: over current, over voltage, etc.

For Charge jumper and switch:

  • For charge only: jumper - top, switch - top
  • For battery power only: jumper - Any, switch - bottom
  • For USB power only, removed battery: jumper - bottom, switch - bottom
  • For USB power + charging battery together: jumper - bottom, switch - top

Demos V1

Documentation and demo:

  • Demo video please see here 01. or see here 02.
  • Demo free to use UDP server (receive data webpage demo) info please see here.
  • Demo full projects please see in our github NBIOT folder (after purchase)