software resources for science and technology education

Mr Bit 2D Models

Building models which you can control with your micro:bit is easy with Mr Bit 2D Models!

The Mr Bit Model Heating System is one of ten 2D models designed for the BBC micro:bit.


The Mr Bit cartoon, a full list of components and instructions for building this model and eight others are available for free download.

All the components for the model are mounted on an A4 stiff card.  In this case we use LEDs, a temperature sensor and a small electric motor.  Simple terminal connector blocks on the back of the card are used to secure the connections which can all be made with a screwdriver.

The LEDs and temperature sensor each need a resistor connection and the motor needs a transistor.  Details of these are given in the free download instructions below.

The micro:bit is also mounted on the back with an opening in the card to show the LED matrix and buttons.

IMB projects Mr Bit models.pdf

Download instructions for 2D models

Mr Bit Model Heating System

The model heating system has a boiler which can be controlled with the micro:bit buttons and a temperature sensor.  

For controlling the boiler, you can write the program in your favourite code editor or with the Mr Bit program.

Typical instructions for coding might be:

When button A gets pressed, switch on the burner until button A gets pressed again or it is warmer than 25 degrees.

Show the temperature on the LEDs until the pump is on.

When the pump is on show the LED message “HEATING ON”.

When the burner is on and button B gets pressed, switch on the pump until button B gets pressed again or the burner goes off.

When the pump is on, switch on the radiator until the pump is off.

Find out more about Mr Bit teaching resources for the BBC micro:bit.

IMB resources

Temperature sensor connections

Motor with transistor

LED connections

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