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The MonkMakes Sensor Board allows you to detect sound levels, temperature and light levels. It features ring pad connectors for use with crocodile clips make it easy to connect to the board to a microbit.
Sound Level: It senses sound level with a MEMs, which is a microphone on a chip that also features a pre-amplifier circuit. You can then use the plot bar graph block in the Microsoft MakeCode editor to display the result on the microbits LED matrix.
Temperature Level: The temperature output from the board is a voltage that indicates the temperature. This is then measured using an analog input on the micro:bit. If you want your temperatures in Fahrenheit, then multiply the temperature in degrees C by 9, divide the result by 5 and then add 32.
Light Level: The light sensor uses a photo-transistor to measure the light level and produces an output voltage that increases as the light level increases.