1. Introduction
This is a multi-functional expansion board designed specifically for the micro:bit mainboard, with a Type-C USB power interface and a dual power supply interface of DC 6-12V external power supply, supporting wide voltage external power input;5V and 3.3V voltage switch, capable of controlling VCC and V voltage values; all gold fingers GPIO pins are arranged as 2.54mm Dupont pin sockets, and multiple I2C bus interfaces, 3.3V/5V voltage grouping pins are reserved, convenient for connecting multiple sensors, actuators, and other peripherals;There is a power signal indicator light, which directly displays the power supply status.
2, Characteristics
1. Straight insertion red gold finger card socket, clear alignment marking (card LOGO facing the arrow direction), micro:bit insertion and removal installation is simple and not easy to insert reversely
2. Full wiring of micro:bit's all IO ports (P0~P16, P19, P20), grouped pin headers according to G/VCC/S signals, wiring with DuPont wire is intuitive and not confusing
3, Dual power supply solution: Type-C USB direct power supply + DC 6~12V external DC power supply, can be connected with a lithium battery pack
4, On-board voltage switchable dip switch, can select output 3.3V or 5V level with one key, compatible with sensor modules
5, Reserved two independent I2C (SCL/SDA) expansion interfaces, directly connected to OLED, TCS34725 color sensor, MPU6050 gyroscope, and other I2C devices
3, Expansion Board Parsing
Single-pole dip switch to switch output voltage
One-click selection of VCC and V output voltage of 3.3V or 5V, flexible to adapt to sensor modules.Note that the appropriate voltage should be selected according to the sensor used to avoid burning out the 3.3V low-voltage sensor due to high voltage!!
I2C bus dedicated interface
Two yellow SCL/SDA expansion sockets on the board, pins defined as SCL, SDA, V, G, standard I2C bus interface, no need to manually cross-connect power supply. (Adaptable module: HS-S63-LTCS342 color sensor, HS-F14LTM1650 four-digit LED digital tube module, HS-F15LTM637 four-digit clock digital tube module, HS-F19LOLED display, HS-F21LLCD1602 display, )