STM32F103 dev board with Air780E 4G and dual 5V relays

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STM32F103 development board, 4G Air780E module, 5V double relay, for IoT

Integrated solution for IoT projects with 4G connectivity and external load control, based on STM32F103 and Air780E LTE Cat.1 bis module with AT firmware and low idle power consumption. Includes two 5V relays controlled from PA4 and PA5, flip-up Nano SIM slot with 4G antenna and network status LED. Simple 5V power supply via USB Type-C or KF128 terminal, easy programming via SWD or USART.

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This development board represents a complete and integrated solution for IoT projects requiring 4G connectivity and control of external loads. It combines an STM32F103C6T6 microcontroller with an Air780E LTE Cat.1 bis communication module, offering a versatile solution for both rapid prototyping and industrial implementations.

The Air780E module supports 4G and is designed for energy efficiency, with a standby current consumption of only 600µA. Factory-installed, the module uses AT firmware and communicates with the STM32 via the serial port, using standard AT commands for data transmission and reception over the network. The board includes two 5V relays, which can be controlled through PA4 and PA5, allowing direct control of external devices such as lighting, fans, pumps, or other equipment.

The board integrates a flip-up type Nano SIM card slot (easy to install and remove), a dedicated 4G antenna, a blue LED indicating the Air780E network status, LEDs for relay status, a reset button, and a user-programmable button. Power can be supplied either via the Type-C port or through the KF128 terminal.

Specifications:

Microcontroller: STM32F103C6T6 based on ARM architecture, 32-bit

4G Module: Air780E LTE Cat.1 bis

Network connectivity: full 4G network

Power consumption: 600µA in standby mode

Power supply: 5 VDC via USB or KF128 terminal

Relays: 2 x 5V, controlled via PA4 and PA5

SIM Slot: Flip-up type for Nano SIM

LED Indicators: Blue for Air780E network status, LEDs for relay status

Buttons: Reset and programmable button

Programming interfaces: USART (TTL) and SWD

Accessible pins: STM32 and Air780E pins brought out

Default firmware: AT firmware on Air780E, communicates with STM32 via AT commands

Dimensions: 62 x 72.5 mm

Layout:

1. USB Type C interface

2. KF128 power terminal

3. Reset button (RST) and user-programmable button KEY (PB12)

4. Nano SIM card holder

5. Air780e module

6. Antenna

7. Blue LED for network status, it blinks intermittently after power-on and blinks faster when connected to the network

8. LED for relay status

9. Double relay, 5V

10. Common IO pins for STM32

11. Common IO pins for Air780e

12. MCU: STM32F103C6T6 (LQFP-48)

Pinout:

Connector	Pin	Role	Notes
Left	5V	5V Power	5V input, same line as USB Type-C power supply
Left	D-	USB data minus	USB data line
Left	D+	USB data plus	USB data line
Left	GND	Ground	Common reference
Left	USB_BOOT	USB boot mode	Startup mode selection related to USB, useful for programming service
Left	VDD_EXT	External logic power supply	External power line for peripherals, depending on board implementation
Left	5V	5V Power	Duplicate on header for quick access
Left	MAIN_TXD	Main UART TX	Serial line, usually to the 4G module for AT commands
Left	MAIN_RXD	Main UART RX	Serial line, paired with MAIN_TXD
Left	GND	Ground	Common reference
Left	PWRKEY	Module power control	Power on/off 4G module via PWRKEY signal
Left	GND	Ground	Common reference
Right	PA4	Relay 1 control	STM32 digital output for relay 1
Right	PA5	Relay 2 control	STM32 digital output for relay 2
Right	PA6	General IO STM32	Available pin for input/output
Right	PA7	General IO STM32	Available pin for input/output
Right	PA9	USART1 TX	Serial for debugging or external communication
Right	PA10	USART1 RX	Serial for debugging or external communication
Right	3V3	3.3V Power	For peripherals at 3.3V
Right	BOOT0	STM32 boot selection	For bootloader, useful for programming via USART
Right	3V3	3.3V Power	Duplicate on header for quick access
Right	SWD	SWDIO	Data line for SWD programming and debugging
Right	CLK	SWCLK	Clock line for SWD programming and debugging
Right	GND	Ground	Common reference

Usage:

Insert an active Nano SIM card into the flip-up slot before powering on. Connect the 4G antenna to the dedicated connector. Power the board either via the USB port or the KF128 terminal.

The factory program on the board makes the STM32 send AT commands to the Air780E to connect to the network. After a successful connection, the blue network status LED will blink at an increased rate, and the two relays will activate automatically. This is the factory program intended to test 4G connectivity.