DIY Contactless Sanitizer Dispenser
A lockdown build: reusing an old RO water cabinet and its solenoid valve, an Arduino Nano, and an ultrasonic sensor to dispense sanitizer touch-free without false triggers.
All tags / DIY
A lockdown build: reusing an old RO water cabinet and its solenoid valve, an Arduino Nano, and an ultrasonic sensor to dispense sanitizer touch-free without false triggers.
A 2.1 sound system built after a proper study of subwoofer acoustics: a ported MDF enclosure sized from Thiele-Small parameters, an NE5532 pre-amp, and a TDA2050 power stage for deep, punchy bass.
Building a full electronic drum kit from piezo triggers and a DIY rack, converting strikes to MIDI, and driving the sounds from GarageBand on an iPhone with headphones.
An IoT build that pulls live COVID-19 figures for India from a web API on an ESP8266 and scrolls them across a 64x32 P4 LED matrix using the PxMatrix library.
A 4x4x4 LED cube driven by an Arduino UNO and 64 LEDs, with the layer-and-column multiplexing code that animates it.
A from-scratch Marshall-inspired Bluetooth speaker in a Deodar wood box, with a TDA8932 amp board, JBL drivers, and a hand-made golden jute grill. The full bill of materials and build.
A from-scratch build log of a man-packable surveillance quadcopter on a Pixhawk flight controller, including every part, why it was chosen, and the trial and error that got it flying.
Air drums that trigger MIDI notes when your hands pass over infrared sensors, built on an ATmega8 at the MIDI baud rate, with a 555-based 38kHz IR front end and TSOP1738 receivers.
A compact desktop speaker built from leftover teak wood and a PAM8610 amp, with a 4 inch driver and a 1.5 inch driver, sanded and polished into a tidy little cube for laptop audio.