Micro: IoT - expansion board for BBC micro:bit IoT - ElecFreaks EF03426

IoT based expansionboard for the BBC micro:bit. It uses the ESP8266 WiFi expansion board and an SPI / I2C serial port to communicate with the micro:bit. The IO ports have micro:bit GVS extensions so that additional components (such as LEDs and servos) can be connected to them. The board has a built-in buzzer module and RTC clock, which allows accurate timing without the need for a power supply. The technology used allows direct connection of OLED, BME280 and IIC.

The manufacturer provides a user's guide which includes, among other things, instructions for coding the module and a diagram of how to run the various components of the board.

Expansion board for micro:bit.

Description of individual pins of the module.

Detailed pinout description can be found on manufacturer website and in user guide.

• Power supply DC: USB 5 V
• Maximum current: 800 mA
• Interface: I2C / SPI
• Direct connection: OLED, BME280 and IIC
• I2C interface ports: 19, 20
• SPI interface ports: 14, 15
• WiFi module: ESP 8266
• RTC module: DS1307 RTC
• Battery type: CR1220
• Buzzer: passive
• PCB thickness: 1.5 mm
• Hole diameter: 2.4 mm
• Dimensions: 71 x 63 x 23 mm
• Weight: 30 g

• ElecFreaks manufacturer website EF03426
• User guide
• Sample program for buzzer
• Sample program for RTC