pxt-calliope/docs/reference/input/magnetic-force.md

Magnetic Force

Find the amount of magnetic force (the strength of a magnet) in the direction you say.

input.magneticForce(Dimension.X);

~hint

The micro:bit measures magnetic force with microteslas.

~

Parameters

• dimension means which direction the micro:bit should measure magnetic force in: either Dimension.X (the left-right direction), Dimension.Y (the forward/backward direction), or Dimension.Z (the up/down direction)

Returns

• a number of microteslas that means the strength of the magnet

Example: metal detector

This program makes the center LED of the micro:bit get brighter when the magnetic force is stronger, and dimmer when it is weaker.

led.plot(2, 2)
basic.forever(() => {
    let f = input.magneticForce(Dimension.X)
    led.setBrightness(f / 2000)
})

See also

compass heading