diy projects
ESP32 AI Calculator V2 Reads Your Handwritten Equations
This open source ESP32 calculator has a camera and two displays, so it can read a handwritten equation and solve it with cloud or…
diy projects
PhoneBot: Turn an Old Android Phone into a $400 Humanoid Robot
UCLA's PhoneBot uses a $50 Android phone as the brain of a 13-joint humanoid. See how it works and how to try the same…
sensors & modules
Sipeed SLogic32U3: A 1.4 GS/s Logic Analyzer for Student Budgets
Sipeed's SLogic32U3 hits 1.4 GS/s over USB 3.2 with 32 channels and a browser app. Here is what it adds and how to learn…
diy projects
Build an ’80s Brick Phone with a Raspberry Pi Pico and Bluetooth
A Pico, a Bluetooth HFP module, and a keypad turn into a retro brick handset that answers your iPhone's calls. Here is how it…
iot & smart home
Raspberry Pi Runs Home Assistant to Track Its Own Net Zero Goal
Raspberry Pi clamped sensors on every breaker and ran Home Assistant on Pi 4 and Pi 5 to cut energy use. Here is how…
diy projects
LED Bubble Hair Extensions with Motion-Reactive Rain Effects
Braid 2020 NeoPixel seed pixels into hair and let an RP2040 Feather and accelerometer turn a head shake into rain and lightning. A weekend…
diy projects
Retro Brick Bluetooth Handset Built with ESP32 and an HFP Module
A retro brick handset pairs with your phone over Bluetooth. See why the ESP32 audio sounded crunchy and how a dedicated HFP module fixed…
diy projects
Negotiator II: A Business-Card USB-C PD Bench Power Supply
Negotiator II turns any USB-C PD charger into an adjustable 5 V to 48 V bench supply on a 2 mm thick card. Here…
esp32 & esp8266
Q8botOne: A Palm-Sized Wire-Free Quadruped on an ESP32-C3
Q8botOne packs eight smart servos and an ESP32-C3 into a 250 g quadruped with no wiring harness. See how its single-PCB design works and…
diy projects
Long-Range Bluetooth LE Mesh on an STM32WB07 Module
An STM32WB07 board with Coded PHY and a 20 dBm amplifier pushes Bluetooth LE to 4.6 km line of sight. Here is how to…
diy projects
ESP32-S3 AM Transmitter Revives Old Tube Radios
AM stations are going dark, but an ESP32-S3 can feed internet radio to old tube sets by shaping a carrier on one GPIO pin…
esp32 & esp8266
ESP32 as a Wi-Fi Card for Raspberry Pi and Linux SBCs
No USB port and weak Wi-Fi on your Linux board? esp-hosted turns an ESP32 into a wireless card over SPI or SDIO. Here is…