Raspberry Pi 4 Project 01: Difference between revisions
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Latest revision as of 23:52, 21 April 2023
LED Bar Graph Pulsating Project
This project involves creating a 10-LED bar graph that pulsates light using a Raspberry Pi 4 and Python code. The LED bar graph will have 10 bars, each controlled by a GPIO pin on the Raspberry Pi.
Required Materials
To complete this project, you will need the following materials:
- Raspberry Pi 4
- Breadboard
- 10 Segment LED Bar Graph | Part COM-09937 (or 10 LEDs in a pinch)
- 10 220-ohm resistors
- Jumper wires
Each LED is connected to a GPIO pin on the Raspberry Pi through a 220-ohm resistor. The GPIO pins used for each LED are as follows:
- LED 1: GPIO 21
- LED 2: GPIO 20
- LED 3: GPIO 16
- LED 4: GPIO 12
- LED 5: GPIO 7
- LED 6: GPIO 8
- LED 7: GPIO 25
- LED 8: GPIO 24
- LED 9: GPIO 23
- LED 10: GPIO 18
Python Code
The Python code for this project is shown below:
import RPi.GPIO as GPIO import time # Set the GPIO pins for the LED bar graph led_pins = [21, 20, 16, 12, 7, 8, 25, 24, 23, 18] # Set the GPIO mode to BCM GPIO.setmode(GPIO.BCM) # Set the LED pins as output for pin in led_pins: GPIO.setup(pin, GPIO.OUT) # Set the initial duty cycle for the LEDs dc = 0 # Loop forever while True: # Increase the duty cycle from 0 to 100 in steps of 5 for dc in range(0, 101, 5): # Set the duty cycle for each LED for i in range(len(led_pins)): GPIO.output(led_pins[i], dc > (i*10)) # ^^^ If the duty cycle is greater than the threshold for this LED, turn it on. # Wait a short amount of time time.sleep(0.05) # Decrease the duty cycle from 100 to 0 in steps of 5 for dc in range(100, -5, -5): # Set the duty cycle for each LED for i in range(len(led_pins)): GPIO.output(led_pins[i], dc > (i*10)) # ^^^ If the duty cycle is greater than the threshold for this LED, turn it on. # Wait a short amount of time time.sleep(0.05) # Cleanup when the program is stopped GPIO.cleanup()