CIRCUITATLASExplore library ↗
A practical field guide for makers

500 ways to make an idea real.

Discover circuits, Arduino builds, and connected IoT projects—organized into a searchable workshop for curious minds.

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300Electronic
circuits
100Arduino
builds
100IoT
projects
COLLECTION MAP LIVE INDEX
CIRCUIT500PROJECT CORE
SENSORS
CONTROL
CONNECT
TRACKS03
PROJECTS500
FORMATSTEP-BY-STEP
Circuit Atlas poster featuring electronic components, an Arduino board, an ESP32 module, sensors and circuit traces for the 500-project libraryFEATURED LIBRARY VISUALExplore all 500 build guides
BEFORE YOU BUILD

Know the parts.
Read the circuit.

The source begins with the essentials—from resistors and semiconductors to test equipment—so every build has a strong foundation.

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RResistorsLimit current and divide voltage01
CCapacitorsStore charge and filter signals02
DDiodesControl the direction of current03
ICIntegrated circuitsCombine complex functions04
PROJECT LIBRARY

Find your next build.

Search all 500 complete guides, including build instructions, components, code, schematics, and original source pages.

500 projects foundShowing 12 of 500
Multiple Sliders for ESP8266 NodeMCU Web Server (WebSocket): Control the brightness of LEDs (PWM) project thumbnail featuring ESP8266, NodeMCU, NETWORK

Multiple Sliders for ESP8266 NodeMCU Web Server (WebSocket): Control the brightness of LEDs (PWM)

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Environment and Weather Monitoring System project thumbnail featuring Environmental temperature sensor shown in the wiring diagram, Humidity sensor shown in the wiring diagram, Barometric-pressure sensor shown in the wiring diagram

Environment and Weather Monitoring System

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IoT Based Home Automation controlled by smartphone project thumbnail featuring Arduino Uno, Power supply, Bluetooth module

IoT Based Home Automation controlled by smartphone

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Designing a Smartwatch using ESP32 - Magnetometer and Gyroscope project thumbnail featuring ESP32, Heart rate sensor, MAX30102

Designing a Smartwatch using ESP32 - Magnetometer and Gyroscope

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IoT Based RFID Attendance System Using Arduino ESP8266 & Adafruit.io project thumbnail featuring NodeMCU - ESP8266, Arduino Board - Arduino UNO/Nano or any other Board, RFID Module - MFRC522 RFID SPI Module

IoT Based RFID Attendance System Using Arduino ESP8266 & Adafruit.io

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Automatic Call answering Machine using Arduino and GSM Module project thumbnail featuring following components to get started, Arduino Uno, GSM module – Flyscale SIM 900

Automatic Call answering Machine using Arduino and GSM Module

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Making calls and sending messages with Arduino and GSM modules project thumbnail featuring Arduino Uno, GSM Module SIM900, x2 LCD, 4x4 Keypad

Making calls and sending messages with Arduino and GSM modules

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ESP32-CAM Face Recognition Door Lock System project thumbnail featuring ESP32, Relay module, Power supply

ESP32-CAM Face Recognition Door Lock System

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YOUR WORKBENCH IS WAITING

Pick a project.
Make it yours.

Five hundred starting points. One is bound to spark the next thing you build.

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