Code
Duration: ~15 minutes
Step 1: wire up the servo
Follow the instructions in servo 101 manual to connect the servo to the micro:bit.
Step 2: code light sensor
Code the light sensor on the micro:bit to control the servo.
basic.forever(function () {
led.plotBarGraph(
input.lightLevel(),
0
)
pins.servoWritePin(AnalogPin.P0, input.lightLevel())
})
It works but your servo might be trying to move too much. Let’s calibrate it.
Step 3: calibrate the servo
Download the servo calibration program to determine the opening and closing angles of the servo for your robot.
We are going to map the light level range, [0, 255]
to the
angle range, [closed, opened]
using pins.map
.
let angle = 0
let closed = 0
let opened = 0
basic.forever(function () {
led.plotBarGraph(
input.lightLevel(),
0
)
angle = pins.map(
input.lightLevel(),
0,
255,
opened,
closed
)
pins.servoWritePin(AnalogPin.P0, angle)
})
// TODO: use the angle found at calibration!
opened = 95
// TODO: use the angle found at calibration!
closed = 175
NEXT: Connect