Tuya Sandwich NB-IoT Board

The Tuya Sandwich NB-IoT communication board (NM1) helps you quickly implement various smart hardware prototypes. You can use the Tuya Sandwich NB-IoT communication board (NM1) together with an MCU to provide networking capability.

Introduction to key components

The Tuya Sandwich NB-IoT communication board adopts the high-performance NB-IoT module NM1 developed by Tuya Smart. The development board contains NB-IoT module NM1, buttons, LED indicators, UART ports, SIM card connector, and more. For more information, see NB-IoT Module Datasheet.

I/O ports and function definitions

• TX0/RX0: Used for firmware upgrade.

• TX1/RX1: Used for MCU general connection.

• TX2/RX2: Used to view logs.

• POWER indicator: 3.3V power indicator light.

• NET indicator: NB-IoT network status indicator light.

• Button PWR: PWRKEY button. You can press and hold for 1 s and then release to start the NM1 module.

• Button RST: The button used to reset the NM1 module, which is active low.

• Other GPIO ports: serial ports and power ports. See the following table.

  No.	Symbol	Description
  1	RST	The hardware reset pin. Its default logic level is high. It is active when pulled down.
  2	3V3	The power supply pin of the module. Its typical supply voltage is 3.3V.
  3	GND	Module power ground.
  4	PWRKEY	The PWRKEY pin of the module which is used to start the module.
  5	PSM_INT	The PSM_INT pin of the module which is used for low-power waking up.
  6	TXD	UART_TXD.
  7	RXD	UART_RXD.

Schematic diagram and PCB

• Schematic diagram of Tuya Sandwich NB-IoT communication board (NM1):
  

• PCB of Tuya Sandwich NB-IoT communication board (NM1):

  

Things to note

• The development board in this solution must be used with a power board and an MCU board.
• The development board in this solution only supports 3.3V power supply, and the supply current is greater than 300 mA.
• The development board in this solution must be used with an IoT card.