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)