2. Bot radio v2
This uses more settings for the motor control by tilting to different degrees.
Three speed settings are used below.
2.1. MoveMotor v3.1 radio v2 files:
Hex Files for the MOVEMotor v3.1 can be loaded via the project:open button at: https://python.microbit.org/v/3
Hex file for the bot
MOVEMotor bot_v2 hex file.Hex file for the hand held controller
MOVEMotor controller_v2 hex file.2.2. Unique groups
Change the group number in
radio.config(group=8) to set unique groups in the room.Make sure all microbits using a bot have the same group number (0-255).
Edit the code below to set the group.
MOVEMotor bot code, change radio group to match bot number
MOVEMotor_v31 200 + bot number
MOVEMotor v2 150 + bot number
2.3. Radio for controller
The code below gives messages based on forwards - backwards tilting and sideways tilting.
The code displays the message on the microbit for testing purposes.
For the forwards and backwards tilting, make sure not to tilt the microbit sideways.
If the microbit is level,
-200 <= y_reading <= 200 and -200 <= x_reading <= 200, send an “X”, to stop.For increasing speed forward, send: F, G, H.
Tilt forwards a bit, F is sent, and a slow speed results.
Tilt forwards a bit more, G is sent, and a medium speed results.
Tilt forwards a lot, H is sent, and a fast speed results.
For increasing speed backward, send: B, C, D
Tilt backwards more and more.
For increasing speed left, send: L, M, N
Tilt left more and more.
For increasing speed right, send: R, S, T
Tilt right more and more.
from microbit import *
import radio
radio.config(group=8) # 0-255
radio.on()
msg=""
while True:
sleep(50)
y_reading = accelerometer.get_y()
x_reading = accelerometer.get_x()
# level sideways only
if -200 <= y_reading <= 200 and -200 <= x_reading <= 200:
msg = "X"
# level sideways only
elif -200 <= x_reading <= 200:
if y_reading > 700:
msg = "D"
elif y_reading > 500:
msg = "C"
elif y_reading > 200:
msg = "B"
elif y_reading < -700:
msg = "H"
elif y_reading < -500:
msg = "G"
elif y_reading < -200:
msg = "F"
else:
if x_reading > 700:
msg = "T"
elif x_reading > 500:
msg = "S"
elif x_reading > 200:
msg = "R"
elif x_reading < -700:
msg = "N"
elif x_reading < -500:
msg = "M"
elif x_reading < -200:
msg = "L"
radio.send(msg)
display.show(msg)
2.4. Radio for microbit on MOVEMotor
The code below moves the MOVEMotor at medium speed, since its top speed is relatively fast.
The radius of 5 gives a tight turn.
Low turning speed settings are used below for best control based on testing.
from microbit import *
import radio
import MOVEMotor
radio.config(group=8) # 0-255
radio.on()
buggy = MOVEMotor.MOVEMotorMotors()
while True:
sleep(50)
msg = radio.receive()
if msg is not None:
display.show(msg)
if msg == "B":
buggy.backwards(speed=5)
elif msg == "C":
buggy.backwards(speed=8)
elif msg == "D":
buggy.backwards(speed=10)
elif msg == "F":
buggy.forwards(speed=5)
elif msg == "G":
buggy.forwards(speed=8)
elif msg == "H":
buggy.forwards(speed=10)
elif msg == "X":
buggy.stop()
elif msg == "L":
buggy.left(speed=2, radius=25)
elif msg == "M":
buggy.left(speed=3, radius=15)
elif msg == "N":
buggy.left(speed=4, radius=5)
elif msg == "R":
buggy.right(speed=2, radius=25)
elif msg == "S":
buggy.right(speed=3, radius=15)
elif msg == "T":
buggy.right(speed=4, radius=5)
2.5. Radio Racing
Tasks
Create an obstacle course and race another bot using radio controls.
Modify the speed settings to suit the obstacle course.
Add B button pressing to allow backwards movement while turning.
Add a variable to keep track of the last msg sent and only send a new msg if it is different to the last msg.
2.6. Radio for microbit on BitBotXL
The code below moves the BitBotXL at maximum speed, since its top speed is relatively slow.
The tightness of 5 gives a tight turn.
High turning speed settings are used below for best control based on testing.
from microbit import *
import radio
import BitBotXL
radio.config(group=8) # 0-255
radio.on()
buggy = BitBotXL.BitBotXLMotors()
while True:
sleep(50)
msg = radio.receive()
if msg is not None:
display.show(msg)
if msg == "B":
buggy.backwards(speed=5)
elif msg == "C":
buggy.backwards(speed=8)
elif msg == "D":
buggy.backwards(speed=10)
elif msg == "F":
buggy.forwards(speed=5)
elif msg == "G":
buggy.forwards(speed=8)
elif msg == "H":
buggy.forwards(speed=10)
elif msg == "X":
buggy.stop()
elif msg == "L":
buggy.left(speed=10, tightness=2)
elif msg == "M":
buggy.left(speed=10, tightness=3)
elif msg == "N":
buggy.left(speed=10, tightness=5)
elif msg == "R":
buggy.right(speed=10, tightness=2)
elif msg == "S":
buggy.right(speed=10, tightness=3)
elif msg == "T":
buggy.right(speed=10, tightness=5)
2.7. Radio for microbit on MiniBit
The code below moves the MiniBit at maximum speed, since its top speed is relatively slow.
The tightness of 5 gives a tight turn.
High turning speed settings are used below for best control based on testing.
from microbit import *
import radio
import MiniBit
radio.config(group=8) # 0-255
radio.on()
buggy = MiniBit.MiniBitMotors()
while True:
sleep(50)
msg = radio.receive()
if msg is not None:
display.show(msg)
if msg == "B":
buggy.backwards(speed=5)
elif msg == "C":
buggy.backwards(speed=8)
elif msg == "D":
buggy.backwards(speed=10)
elif msg == "F":
buggy.forwards(speed=5)
elif msg == "G":
buggy.forwards(speed=8)
elif msg == "H":
buggy.forwards(speed=10)
elif msg == "X":
buggy.stop()
elif msg == "L":
buggy.left(speed=10, tightness=2)
elif msg == "M":
buggy.left(speed=10, tightness=3)
elif msg == "N":
buggy.left(speed=10, tightness=5)
elif msg == "R":
buggy.right(speed=10, tightness=2)
elif msg == "S":
buggy.right(speed=10, tightness=3)
elif msg == "T":
buggy.right(speed=10, tightness=5)