In addition to displaying the diamond when the y-axis tilt is close to level, the radio_tilt_bot_fb_with_stop_range script also makes the cyber:bot stay still.
# radio_tilt_bot_fb_with_stop_range from cyberbot import * import radio radio.on() radio.config(channel=7, queue=1, length=64) while True: packet = radio.receive() if packet: dictionary = eval(packet) x = dictionary.get('x') y = dictionary.get('y') needle = dictionary.get('needle') fb = y / 10 if abs(fb) > 8: display.show(Image.ALL_CLOCKS[needle]) vL = fb vR = -fb else: display.show(Image.DIAMOND_SMALL) vL = None vR = None bot(18).servo_speed(vL) bot(19).servo_speed(vR)
While still holding the transmitter micro:bit level, does the cyber:bot stay still?
As you tilt the tilt transmitter away from and then toward you, does it make the cyber:bot roll forward and backward?
Here is the portion of radio_tilt_bot_fb_with_stop_range that’s different from the previous radio_tilt_bot_fb_only that it’s based on.
if abs(fb) > 8: display.show(Image.ALL_CLOCKS[needle]) vL = fb vR = -fb else: display.show(Image.DIAMOND_SMALL) vL = None vR = None
Keep in mind that fb is y / 8, so instead of looking for y being outside the +/- 80 range, this program checks if fb is outside the +/- 8 range. When the absolute value of fb is greater than 8, the script displays the tilt needle and sets the vL and vR variables just like it did in the previous radio_tilt_bot_fb_only script. But when fb falls inside the -8 to 8 range, it displays the diamond and sets vL and vR to None.
Whenever the else block sets vL and vR to None, it makes the servos stay still. It’s actually better than setting vL and vR to zero because None causes servo_speed to stop sending control signals. This prevents any slow wheel rotation that might otherwise occur when the servos are slightly out of calibration and the speeds are set to 0.
bot(18).servo_speed(vL) bot(19).servo_speed(vR)