Battery-powered 18-channel sequential pyrotechnic initiator controller triggered by qualified 18 V COBRA pulses, with three six-channel RJ45 outputs and lockout after channel 18.
Battery-powered ESP32 prototype for measuring soil/road-surface condition using HX711 load cell, MPU6050 vibration/tilt sensing, and DS18B20 temperature sensing from 18650 battery power.
Battery-powered minimal ST-4 dither timer for iOptron HEM27EC: two AAA cells, ATtiny1616 controller, opto-isolated RA+/RA-/DEC+/DEC- contact closures, physical interval/intensity selectors, DITHER NOW button, and low-power status LED. The previous ESP32-S3 USB-host design is preserved only as a conditional V2 archive.
18 V battery-powered BLDC blower control board using an Arduino Nano, LM2596 5 V buck module, P-channel MOSFET power cutoff, battery voltage sensing, potentiometer input, buzzer, and red/green status LEDs. High-current 18 V blower path is sized for up to 5 A.
Battery-powered smart pet collar PCB with ESP32-class wireless MCU, GPS, heart sensing, temperature, motion sensing, microphone, USB programming, and mobile-app data connectivity.
Hand-solderable 9V battery-powered red LED blinker using a 555 timer in astable mode, an on/off switch, and through-hole support components for approximately one blink per second.
