Raspberry Pi Pico & Sweeping Servo
A servo motor is a compact motor whose shaft turns to position something based on a control signal. The common servo motor consists of plastic housing that contains a small motor, control circuitry, and a […]
Arduino Touch Sensor/Capacitive Proximity Sensor
A capacitive proximity sensor is a non-contact device that can detect the presence or absence of an object in its close vicinity. It utilizes the electrical property of capacitance and the change of capacitance based […]
Arduino Optical/Light Theremin – Make it Yourself!
The theremin is an electronic musical instrument with two metal rods (antennas) used to control pitch and amplitude by the human operator using hand gestures. The left rod (a horizontal hoop) reduces the amplitude as […]
Toy Car Signal Light & Siren
This post showcases an example project I made to help you add a terrific signal light and siren to almost all toy cars. As we all know, cheap remote control (radio control) toy cars (R/C […]
MAX30100 Pulse Oximeter & Heart Rate Sensor Module – Quick Refresher
The moment you get a MAX30100 pulse oximeter and heartrate sensor breakout board, you can move on to the process of making your own perfect pulse oximeter. But is making one as easy as you […]
Pool LED Lamps & Idea Sparks
Recently while searching for little floating toys, I came across some inexpensive Chinese LED pool lamps. Most sellers described them as water-activated lotus/lily LED flower lamps. Out of curiosity, I purchased a few of them […]
Raspberry Pi Pico & Little Light Stick (v1)
A couple of months after its release, ultimately, I got a hand on the Raspberry Pi Pico, and posted a few hobby projects here. The RPi Pico is a microcontroller board centered on the RP2040 which’s […]
Little Light Sensor Switch OPT101
Some time ago my neighbor asked me to design a better light sensor module. In fact, he already has a few small light sensor modules to automatically control the lights in his barn. Those cheap […]
Solar LED Lantern Torch – Quick Teardown
Have you ever wondered what’s inside this cheap Chinese Solar LED Lantern Torch? Although it appears like a safe and beautiful emergency lamp, be aware that it has the potential to kill you through its […]
Wet Floor Warning LED Sign
It’s human nature to let our guard down temporarily and be distracted by random thoughts or doing multiple activities. A momentary lapse of attention that ends in a slip can led to a variety of […]