Our earlier ultrasonic sensor article covered the HC-SR04's wiring and distance-calculation math with results printed to the Serial Monitor; this project keeps the same core logic but shows the live distance reading on an LCD screen instead, useful for any project that needs to display the measurement without a computer connected.
Components needed
An Arduino Uno, an HC-SR04 ultrasonic sensor, a 16x2 LCD display (direct-wired or I2C), and connecting wires.
Wiring it up
The sensor's Trig and Echo pins connect to two digital pins on the Arduino, exactly as in our original ultrasonic article. The LCD connects following whichever scheme its module needs.
Programming it
Send a short trigger pulse and measure the echo duration with a timeout so the sketch cannot hang when no echo returns. Distance is the round-trip time multiplied by sound speed and divided by two. Temperature, target angle, soft materials, and the sensor working range all affect accuracy.
A practical touch
Because the reading updates rapidly, clearing only the digits (rather than the whole screen) before writing the new value avoids a visible flicker — writing a few trailing spaces after the number handles cases where a shorter new reading would otherwise leave old digits behind.
You can find HC-SR04 ultrasonic sensors and LCD displays at Juthour Tech.
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