Using RTC time in Rasberry Pi Programs

[sab201]

Good Day,

I need some advice on this. I am planning to generate pwm with different frequencies from a Rasberry Pi 5. I learnt that the Pi 5 has an RTC and it can be enabled by connecting the official 3 Volt rechargeable battery. Unfortunately this battery is out of stock for me.

I want to write a program in which I want to specify the time of the day at which the program starts to generate a pwm of say 110 Hz at 11:08 AM and it does until 12:04 PM. Then from 12:04 PM to 1:10 PM it generates a pwm at 316 Hz. Like this I want it to generate pwm of specific frequencies at different hours of the day for 24 hours.

Is it possible to write a program for this application in Python. Or which language is best for this type of programs. I will be keeping the Pi 5 powered on all the time with backup to generate pwm so it wouldn't go off power. I like to know if I can specify the clock time in the program exactly the time of the day instead of specifying the period of time in the program.

I am not an expert in programming I am just giving an approximate example

from time 11:08 to 12:04 Local Time
pwm start pin 14
frequency 110 Hz
Duty Cycle 50 percent
from time 12:05 to 13:10 Local Time
pwm start pin 14
frequency 316 Hz
Duty Cycle 50 percent
.
.
.
.
Is it possible to do this.

Thanks

[snippsat]

Can do it in different ways eg with datetime, time.
Using cron that's build into OS.
A library like schedule can make it easier.
Example.

import RPi.GPIO as GPIO
import schedule
import time

# Set up
PWM_PIN = 14
GPIO.setmode(GPIO.BCM)
GPIO.setup(PWM_PIN, GPIO.OUT)
pwm = GPIO.PWM(PWM_PIN, 110)
pwm.start(50)

def set_pwm_110hz():
    print("Setting PWM frequency to 110 Hz")
    pwm.ChangeFrequency(110)

def set_pwm_316hz():
    print("Setting PWM frequency to 316 Hz")
    pwm.ChangeFrequency(316)

def stop_pwm():
    print("Stopping PWM")
    pwm.ChangeFrequency(0)

# Schedule the tasks
schedule.every().day.at("11:08").do(set_pwm_110hz)
schedule.every().day.at("12:04").do(set_pwm_316hz)
# Add more schedules as needed
# Example: schedule.every().day.at("13:10").do(stop_pwm) for stopping or changing frequency

try:
    while True:
        schedule.run_pending()
        time.sleep(1)
finally:
    pwm.stop()
    GPIO.cleanup()