The MonkMakes Sensor Board for micro:bit allows you to sense sound level, temperature and light level.

Features

3V and GND connections can be made from either side and allow you to power a second board such as the
MonkMakes Relay Board or MonkMakes Speaker.
LED ‘power on’ indicator
Reverse polarity protection
All three sensors are analog and can be connected to pins P0, P1 and P2 using alligator clips.

Getting Started

Connecting to your micro:bit

You only have to wire up the sensors that you are actually using, but you could wire all the sensors up as shown .
The code examples below assume that pin 0 is used for sound, pin 1 for temperature and pin 2 for light.
You can use any pin for any of the sensors, but remember to modify the code to match the pin you are using.

Sound

The Sensor for micro:bit uses a MEMs (microphone on a chip) and a pre-amplifier.
The output of the sound sensor is connected to an analog input where it can be sampled.
The sound signal varies about the 1.5V level.
So, silence will produce an analog output of around 1.5V. When there is sound the analog readings will oscillate above and below the 1.5V level

Temperature

The Sensor for micro:bit uses a thermistor to measure temperature.
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.

The calculations for converting this voltage reading to an actual temperature are quite complicated and so
the code examples here will only give a rough idea of temperature.

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

The light sensor uses a phototransistor to measure the light level and produces an output voltage that increases as the light level increases.
Here is a guide to the kind of light level you might get from the sensor under different conditions (0 to 1023).

Dark 0 to 3
Dimly lit room 6 to 10
Indoors directly under a light 10 to 50
Outdoors (dull day) 100 to 200
Outdoors (sunny day) 800 to 900

Even though the maximum analog read value is 1023, the maximum reading from this sensor is around 900.

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