MicroPython Tutorial XVIII

Ok, lets do something else for a break and indeed touch on the last sensor we’re going cover, which is called ironically touch, pun intended.

You get two touch sensors in both kits I believe, and it is quite simple to use them, with just two properties. Either they are being touched or not basically.

Let combine this with a common requirement you get in lots of app, the requirement to time something. We’re going a use a special method you get with MicroPython and combined with some simple math. Here is our basic script.

#!/usr/bin/env pybricks-micropython
from pybricks import ev3brick as brick
from pybricks.parameters import Color, Port
from pybricks.tools import wait, StopWatch
from pybricks.ev3devices import TouchSensor
touchS3 = TouchSensor(Port.S3)
watch = StopWatch()
ptime = 0
gap = 1000
while True:
    if touchS3.pressed():
        brick.light(Color.YELLOW)
        print("reset",watch.time())
        watch.reset()
    else:
        timeFreeze = watch.time() // gap
        timInt = timeFreeze % gap
        if ptime != timInt:
            print("watch.time",timInt)
            ptime = timInt
            if timInt % 2 == 0:
                brick.light(Color.RED)
            else:
                brick.light(Color.BLACK)

What does it do. We import the standard libraries and define a touch sensor that we previously plugged into port 3. Now we start a “stop watch” process that basically starts to count as soon…