RC Car

[mishu28nmv]

Hy to all. I'm new to coding and RC World. I have a RC Truck that I want to upgrade with the H Bridge and the RPi 3B+. Tryed with 2 motors and the Robot example, but I have only 2 'controls: pressing top or left: the 2 motors go clock way pressing bottom or right: the 2 motors go counterclock way. I want to: press top:motor 1 goes clock way press bottom:motor 1 goes counterclock way press left:motor 2 goes clock way press right:motor 2 goes counterclock way. Like in a normal RC Car not a Robot.

Thank you for all your effort!

[mishu28nmv]

Never mind, did it on my own. Here is the code for a RC Car:

from bluedot import BlueDot
from gpiozero import Motor
from signal import pause

bd = BlueDot()
bd.border = True
motor1 = Motor(forward=23, backward=24)
servo = Motor(forward=17, backward=22)

def move(pos):
    if pos.top:
        motor1.forward()
    elif pos.bottom:
        motor1.backward()
    elif pos.left:
        servo.forward()
    elif pos.right:
        servo.backward()        

def stop():
    motor1.stop()
    servo.stop()

bd.when_pressed = move
bd.when_moved = move
bd.when_released = stop

pause()

[martinohanlon]

Well done.

[mishu28nmv]

Well done.

Thank you. Can you tell me what is the command to split the dot in 4 zones? Something like this? picture

[mishu28nmv]

Saw that in your examples one time, but I can't find it anymore :(

[martinohanlon]

I'm not sure what you mean, the link you include is broken. I get URL is unresolved.

[mishu28nmv]

Sorry for the link. Was a picture with a circle with 4 visible zones. I have now the hole circle with border and I want to split it in 4 zones with border for each zone. So the up, down, left, right zones are visible thanks to the border.

[martinohanlon]

There is no way of changing the app so it shows the top, bottom, left, right sections.

[mishu28nmv]

Ok. Can we have multi touch? For example when I press up and right at the same time, the RC car goes forward and turns right?

[martinohanlon]

The app supports multitouch but it only returns single positions for the dot.

I would suggest if you want to do something like "forward and right" you use the angle of where the dot was pressed. That way you cant tell if the dot is pressed in the top right, rather than just at the top.

e.g.

from bluedot import BlueDot
from gpiozero import Motor
from signal import pause

bd = BlueDot()
bd.border = True
motor1 = Motor(forward=23, backward=24)
servo = Motor(forward=17, backward=22)

def move(pos):
    if pos.angle > 22.5 and pos.angle < 67.5:
        motor1.forward()
        servo.backward()

def stop():
    motor1.stop()
    servo.stop()

bd.when_pressed = move
bd.when_moved = move
bd.when_released = stop

pause()

[mishu28nmv]

Ok super. I will write all the comands for the other turns and I will upload it here. After that can you upload it here and to your website if you want. I think it will be a great succes! Thank you for all your help!

[mishu28nmv]

Code for RC Car

from bluedot import BlueDot
from gpiozero import Motor
from signal import pause

#moving pins 23,24; steering pins 17,22

bd = BlueDot()
bd.border = True
motoras = Motor(forward=23, backward=24)
servo = Motor(forward=17, backward=22)

def move(pos):
    if pos.angle > -22.5 and pos.angle < 22.5:
        motoras.forward()
    elif pos.angle > 22.5 and pos.angle < 67.5:
        motoras.forward()
        servo.backward()
    elif pos.angle > 67.5 and pos.angle < 112.5:
        servo.backward()
    elif pos.angle > 112.5 and pos.angle < 157.5:
        motoras.backward()
        servo.backward()
    elif pos.angle > -157.5 and pos.angle < 157.5:
        motoras.backward(1)
    elif pos.angle > -157.5 and pos.angle < -112.5:
        motoras.backward()
        servo.forward()
    elif pos.angle > -112.5 and pos.angle < -67.5:
        servo.forward()
    elif pos.angle > -67.5 and pos.angle < -22.5:
        motoras.forward()
        servo.forward()        

def stop():
    motoras.stop()
    servo.stop()

bd.when_pressed = move
bd.when_moved = move
bd.when_released = stop

pause()

Thank you!

[neithere]

If you have a two-wheel robot (one motor per wheel), it's easy to use one circle for quite a bunch of movements. I've set a dead zone within 0.2, otherwise y is divided into forward/backward and x into left/right; then "pure right" (x > 0.2, y within 0±0.2) means "turn right in place" (left motor forward, right motor backward), but if y meaningfully deviates from zero, "forward-ish right" means outer right turn (left wheel forward, right on hold) and "backward-ish right" means inner right turn (left wheel on hold, right wheel backwards). So you can get a lot of precision movements with just a single blue circle; basically everything that is doable with such configuration is covered. Of course you can also regulate the speed of the motors: the farther is the point from the center, the faster you move.