A compact DIY FIDO2 security key can be built around Nordic Semiconductor’s nRF52840, which provides the processing, native USB connectivity, and hardware-accelerated cryptography needed for secure authentication.
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FIDO2 Security Key with nRF52840 and OpenSK
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Smart Laser Distance Meter Using STM32 and VL53L4CX
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As a smart digital measuring tape, it can measure distance, calculate area and volume, determine indirect height using tilt information, track maximum and minimum distances, and work as a digital spirit level. All of these functions are controlled using a single spring-return rotary knob and displayed on a 1.3-inch OLED.
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Build Your Own USB-C Power Meter
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In this project, we built a DIY inline USB-C power meter that measures voltage from 5 to 28 V and current up to 5 A. It also tracks charge and energy consumption, records minimum, maximum, and average readings, and displays a rolling 30-second graph of voltage, current, and power on a colour IPS display.
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Parking Space Detection System Using ESP32-CAM
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Learn to build an ESP32-CAM Parking Space Detection System that detects parking availability in seconds using cloud API, Wi-Fi, and real-time image processing.
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ESP32 2424S012C Teardown
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ESP32 2424s012C Teardown: Explore PCB layers, full FPC pinout, ESP32-C3 schematic, GC9A01 display driver, CST816D touch IC, IP5306 charger & A6165P LDO - with annotated diagrams.
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ESP32 GSM Calling Device with Auto Answer Using GeoLinker
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Build an ESP32 GSM Calling Device using the GeoLinker GL868 board with ESP32-S3 and SIM868. This project demonstrates automatic voice calling through a push button and auto-answer functionality for incoming calls.
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ESP32-CAM for Face Detection Using CircuitDigest Cloud
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Build a real-time face detection system using ESP32-CAM and CircuitDigest Cloud API. Full Arduino source code, circuit diagram, and real-time Serial Monitor output included.
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Built a ESP32-CAM Waste Detection Using AI Image Processing
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Build a smart waste detection system using ESP32-CAM and AI image processing. Classify biodegradable & non-biodegradable waste in seconds. Free API, full code included.
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ESP32-CAM Indian Currency Recognition and AI Speech
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Build a smart ESP32-CAM Indian Currency Recognition and CircuitDigest Cloud AI. Captures, identifies denomination & announces via speaker. Perfect for visually impaired users.
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Arduino LVGL Tutorial: Build ESP32 GUI Step-by-Step
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Learn how to build a touch-interactive LVGL Arduino GUI on ESP32-C3. Step-by-step tutorial with code, wiring, and troubleshooting for beginners.
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