Control your Arduino board using Python Script

We can control a arduino board from a PC or raspberry pi using python script running on it. This video shows a python package named "pyfirmata" which helps us to control arduino board. We will have to upload "standard firmata " code which is available in arduino example code in arduino IDE.

Get know about installing python and pip from the below video

Click below for pyfirmata python package

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[rayleblanc]

I finally figured out how to control a servo with a potentiometer attached to my arduino mega 2560 through my raspberry pi 4 and a python script. In the While True loop " Variable 'a' takes the float analog input and multiplies it by 1000 and puts the values on the left side of the decimal point. Variable 'b' turns the float to an integer and rounds it off removing the decimal. Variable 'c' takes the integer value and by dividing by 5.54 returns the potentiometer values from 0 up to 180 ( as you turn the potentiometer knob) Then a print and round integer 'c', prints out on the console, then create a variable called angle = c, then Myservo1.write(angle). It works great
Here is my script.
.import pyfirmata
from pyfirmata import ArduinoMega
import time
from time import sleep

sleep(5)
board = ArduinoMega('/dev/ttyACM0')

mega = {
'digital' : tuple(x for x in range(54)),
'analog' : tuple(x for x in range(16)),
'pwm' : tuple(x for x in range(2, 14)),
'use_ports' : True,
'disabled' : (0, 1, 14, 15) # Rx, Tx, Crystal
}
it =
it.start()

analog_input = board.get_pin('a:1:i')
Myservo1 = board.get_pin('d:3:s')


while True:
analog_value = analog_input.read()
if analog_value is not None:
a = analog_value * 1000
b =(int(round(a)))
c = b / 5.54
print(int(round(c)))
angle = c
Myservo1.write(angle)
time.sleep(0.01)

[rayleblanc]

I have another question. Is there a way to clear contents of a variable before restarting a program ? I have a script that reads and prints the input signal from a hobby RC receiver. My If statement is if the transmitter is off to blink an LED light and print "NO SIGNAL". It only works the first time I run the program with the receiver turned off. When I turn on the receiver get my signal then stop and run it again with the receiver off, it prints the last values it had. How can I get it cleared out?

[rayleblanc]

How can I use the input from a potentiometer on the arduino and convert it to numeric value 0 to 180 and control a servo from python

[sreeshasanju]

Sir.. Can tell me how to feed a predefined input data (in case of operating servo ) in python

[advrxh]

Sir can u please share the source code for ultrasonic sensor data reading in pyfirmata....THAT IS HRS04 sensor