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Read from Ultrasonic Module

In this project, we use ultrasonic sensors to measure distance and display the readings on the I2C LCD1602.

_images/ultrasonic.jpg

Steps

  1. In this project, an I2C LCD1602 is used, so it’s necessary to download the relevant libraries to make it work.

    cd ~/
wget https://github.com/sunfounder/raphael-kit/blob/master/python/LCD1602.py

  2. Install smbus2 for I2C.

    sudo pip3 install smbus2

  3. Save the following code to your Raspberry Pi and give it a name, for example, ultrasonic.ty.

    from robot_hat import ADC, Ultrasonic, Pin
import LCD1602
import time

# Create ADC object for photoresistor
a0 = ADC(0)

# Create Ultrasonic object
us = Ultrasonic(Pin("D2"), Pin("D3")) //Trig to digital pin 2, echo to pin 3

def setup():
    # Initialize LCD1602
    LCD1602.init(0x27, 1)
    # Initial message on LCD
    LCD1602.write(0, 0, 'Measuring...')
    time.sleep(2)

def destroy():
    # Clear the LCD display
    LCD1602.clear()

def loop():
    while True:
        # Read distance from ultrasonic sensor
        distance = us.read()
        # Display the distance on the LCD
        if distance != -1:
            # Display the valid distance on the LCD
            LCD1602.write(0, 0, 'Dist: %.2f cm   ' % distance)

        # Update every 0.5 seconds
        time.sleep(0.2)

if __name__ == '__main__':
    setup()
    try:
        loop()
    except KeyboardInterrupt:
        destroy()
    except Exception as e:
        # Clear the LCD and print error message in case of an exception
        destroy()
        print("Error:", e)

  4. Use the command sudo python3 ultrasonic.ty to run this code.