Circuit Splash

Complete guide to building a precision digital micro ampere meter using STM32. Measures nA to mA with OLED display. Includes circuit, PCB files, firmware & 3D enclosure. DIY ampere meter DC digital.

We have built a Volume Meter or VU meter, with the help of MIC, OP-AMP and LM3914, which glows the LEDs as per strength of the sound, if sound is low, lesser LEDs will glow, and if sound is High more LEDs will glow, check the Video at the end. VU meter also serves as a volume measurement device.

In this project, we built a DIY inline USB-C power meter that measures voltage from 5 to 28 V and current up to 5 A. It also tracks charge and energy consumption, records minimum, maximum, and average readings, and displays a rolling 30-second graph of voltage, current, and power on a colour IPS display.

Build an IoT-based smart energy meter using ESP32 & PZEM-004T. Real-time monitoring via the MQTT dashboard, SMS alerts for abnormal conditions. Complete circuit & code included.

Learn how to interface the GP2Y0D810Z0F infrared distance sensor with Arduino Uno and a 16×2 I2C LCD to detect objects within 10 cm, with circuit diagram, code explanation, working principle, and real-world applications.

Build a smart wearable pendant that tracks air quality with STM32 and SGP40 sensors, alerting users through LEDs and buzzer notifications for real-time environmental awareness.

HC-SR04 Ultrasonic sensor is a 4 pin module used in many applications where measuring distance or sensing objects are required. Check out this article to find more details about ultrasonic sensor like pinout, datasheet and technical specifications.

Water level controllers are useful devices. In this water level indicator and controller project we are going to use an Arduino board and ultrasonic sensor to measure the water level in a tank. We will also start the water pump automatically when water level goes low below a certain preset level.

In this project we are going to design a 25V range digital voltmeter by using ATMEGA32A microcontroller. In ATMEGA, we are going to use 10bit ADC (Analog to Digital Converter) to build a digital voltmeter. Now the ADC in ATMEGA can not take a input more than +5V, so for getting a higher range we are going to use a voltage divider circuit.