Learn electronics, coding, and projects — step by step.
This is my own version of automatic (No touch / touchless) alcohol / sanitizer dispenser. This is especially useful during this COVID19 pandemic. In here, we will be using an ultrasonic sensor to detect the presence of hand near the dispenser. When the ultrasonic sensor detects an object less than the set distance, it will […]
This tutorial is about the commonly use HC-SR04 ultrasonic sensor. We will give some details about it, explain how it works, and at the last part we will create an Arduino sketch to test its functionality. HOW HC-SR04 WORKS The HC-SR04 ultrasonic sensor uses a sound frequency to determine distance of an object just like […]
I have here an L293D Motor Driver Shield V1. It has 2 pieces L293D dual H-bridge motor driver IC to be able to provide control to a total of 4 DC motor. It also comes with 74HC595 shift registers to minimized the use of pins. PINOUT DC Motors Motor 1: digital pin 11 Motor 2: […]
The L298N motor driver module is a cheap solution when you need to drive 2 DC motors or 1 stepper motor. It is a popular motor driver module among DIYers and hobbyists due to its ease of use and availability. Features: It has a dual H-bridge motor driver. Onboard 5V linear voltage regulator means you […]
In my desire to tinker with the SD card, I come up with a plan to create a mini karaoke player using Arduino microcontroller, Keypad and LCD shield as keypad and display, and SD card as data source of sound and lyrics files. Two weeks ago, I am able to play wav files from SD […]