news & releases
Circuit.Rocks Sponsors SparkFest 2026: GDG PUP Hackathon on July 9
Circuit.Rocks is an official hardware sponsor of SparkFest 2026 - the Google Developer Group PUP hackathon on July 9 at PUP Main Campus, Bulwagang…
esp32 & esp8266
Build a Palm-Vein Biometric Door Lock with an ESP32 and IR Camera
An ESP32, a DFRobot dual-camera module and 940nm infrared light read the veins under your palm. Here is the parts list and the wiring…
diy projects
ATtiny816 PCB Business Card Runs 21 LEDs on Harvested NFC Power
No battery, no charging port. This PCB business card harvests power from your phone's NFC field to run an ATtiny816 and light 21 Charlieplexed…
diy projects
An ATmega Robot Arm That Serves Badminton Shuttlecocks
A Denso VS050 arm, a pneumatic grabber and two silicone-rimmed discs turn a solo badminton drill into a robotics build you can scale down.
diy projects
This ESP32 CHIP-8 Computer Runs on a Flame and a Stirling Engine
No battery, no wall wart. A Stirling engine and a candle push enough current to run an ESP32 CHIP-8 machine with an OLED and…
diy projects
Wireless ESP32 Bike Brakes: ABS From Car Door Lock Actuators
A fat-bike brake with no cable at all: ESP32 nodes talking over ESP-NOW drive car door lock actuators, unlocking ABS and an adjustable bite…
news & releases
Banana Pi’s BPI-AI2N Packs 15 TOPS of Vision AI Into a Module
Banana Pi's BPI-AI2N runs vision models on-device: a Renesas RZ/V2N module with 15 TOPS, 8 GB of RAM, dual GbE and two MIPI CSI…
iot & smart home
WeatherXM D2 Mesh: A Solar LoRa Weather Station With No Wi-Fi
A solar weather station that reports over a LoRa mesh instead of Wi-Fi or cellular, plus how to build a cheap ESP32 version of…
arduino
An Arduino Nano ESP32 Robot Flips All 666 Pixels of This Display
Most flip-disc displays need one solenoid per pixel. This 666-tile panel uses a single Arduino Nano ESP32 gantry robot that prods each tile instead.
arduino
Never Buy the Same L298N Twice: An Arduino UNO Q Parts Tracker
A maker got tired of owning eight identical motor drivers, so he built an Arduino UNO Q inventory tracker that answers one question: do…
diy projects
A Parody Apple Laptop Reborn: The RP2350 Mactini Actually Works
A 20-year-old Apple parody became real hardware: an RP2350 running FreeRTOS, DMA-driven graphics and an alphabet you tap out on one capacitive pad.
diy projects
Build a Digital Nose: an SGP30 Sensor That Sniffs Out Spoiled Milk
Your nose gives a yes-or-no answer. An SGP30 gas sensor gives you a number you can plot, and the whole freshness checker is a…
diy projects
A XIAO ESP32-S3 Clock Hiding Inside a Fake Linksys WRT Router
Glen Akins rebuilt the mid-2000s Linksys WRT router as an NTP desk clock, swapping a Raspberry Pi Zero 2 W for a 21 mm…