Project 11 IR Remote Control Smart Car

1.Description

In this project, we will work to control the car using an IR remote control.

2.Flow Diagram

3.Test Code

from machine import Pin,I2C
import mecanumCar_v2
import time

i2c = I2C(0, sda = Pin(20), scl = Pin(21), freq = 400000) #iic0 sda-->20,scl-->21
mecanumCar = mecanumCar_v2.Driver(i2c) #Create a driver instance for the car

ird = Pin(6,Pin.IN) #IR receiver pin interface is GPIO6

#IR decoder dictionary
act = {"1": "LLLLLLLLHHHHHHHHLHHLHLLLHLLHLHHH","2": "LLLLLLLLHHHHHHHHHLLHHLLLLHHLLHHH","3": "LLLLLLLLHHHHHHHHHLHHLLLLLHLLHHHH",
       "4": "LLLLLLLLHHHHHHHHLLHHLLLLHHLLHHHH","5": "LLLLLLLLHHHHHHHHLLLHHLLLHHHLLHHH","6": "LLLLLLLLHHHHHHHHLHHHHLHLHLLLLHLH",
       "7": "LLLLLLLLHHHHHHHHLLLHLLLLHHHLHHHH","8": "LLLLLLLLHHHHHHHHLLHHHLLLHHLLLHHH","9": "LLLLLLLLHHHHHHHHLHLHHLHLHLHLLHLH",
       "0": "LLLLLLLLHHHHHHHHLHLLHLHLHLHHLHLH","Up": "LLLLLLLLHHHHHHHHLHHLLLHLHLLHHHLH","Down": "LLLLLLLLHHHHHHHHHLHLHLLLLHLHLHHH",
       "Left": "LLLLLLLLHHHHHHHHLLHLLLHLHHLHHHLH","Right": "LLLLLLLLHHHHHHHHHHLLLLHLLLHHHHLH","Ok": "LLLLLLLLHHHHHHHHLLLLLLHLHHHHHHLH",
       "*": "LLLLLLLLHHHHHHHHLHLLLLHLHLHHHHLH","#": "LLLLLLLLHHHHHHHHLHLHLLHLHLHLHHLH"}

def read_ircode(ird):
    wait = 1
    complete = 0
    seq0 = []
    seq1 = []

    while wait == 1:
    	 if ird.value() == 0:
            wait = 0
    while wait == 0 and complete == 0:
        start = time.ticks_us()
        while ird.value() == 0:
            ms1 = time.ticks_us()
        diff = time.ticks_diff(ms1,start)
        seq0.append(diff)
        while ird.value() == 1 and complete == 0:
            ms2 = time.ticks_us()
            diff = time.ticks_diff(ms2,ms1)
            if diff > 10000:
                complete = 1
        seq1.append(diff)

    code = ""
    for val in seq1:
        if val < 2000:
            if val < 700:
                code += "L"
            else:
                code += "H"
    # print(code)
    command = ""
    for k,v in act.items():
        if code == v:
            command = k
    if command == "":
        command = code
    return command

while True:
    command = read_ircode(ird)
    if command == "Up":
    	 mecanumCar.Advance()
    elif command == "Down":
        mecanumCar.Back()
    elif command == "Left":
        mecanumCar.Turn_Left()
    elif command == "Right":
        mecanumCar.Turn_Right()
    elif command == "Ok":
        mecanumCar.stop()

4.Test Result

Uploading the test code and powering up. When we press the buttonon the remote control, the car moves forward, then , the car turns left, ,the car moves back,, the car turns right,, the car stops.

5.Code Explanation

command = read_ircode(ird)	IR remote decodes, and the key values will be saved in command
if command == “Up”:	The car will go forward
elif command == “Down”:	The car will move back
elif command == “Left”:	The car will turn left
elif command == “Right”:	The car will turn right
elif command == “Ok”:	The car will stop