Carry the Arduino World in Your Pocket
Projects, component database, personal workshop, and badge system. Start for free, unlock the limits with premium.
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What Can You Do?
Push the boundaries of the electronics world with BlueGrays.
Rich Project Library
Explore Arduino and electronics projects. Learn step by step with circuit diagrams, code, and build videos.
Electronics tools
Color code · LED resistor · Ohm's law
Pinout
Interactive pinouts of 10 boards: analog, PWM, I2C, SPI and UART pins with board-specific code samples and warnings.
Electronic Components Database
Sensors, boards, motors — hundreds of components and the projects they're used in.
What shall we build today?
Find the right project in 3 questions.
Find a projectCommunity Forum
Ask questions, share ideas, solve problems together.
Pick your board, find your project
Projects made for the board you have, with circuit diagrams and code.
Discover Arduino Projects
Hundreds of projects from beginner to advanced — schematics, code, and videos.
Electronics tools
The calculations and tables you need most while building circuits, in one place. Runs in your browser and gives the same results as the app.
Electronics guides
Get to know the parts, choose the right board and build your projects with confidence.
ComponentsWhat Is an LDR Light Sensor? Measuring Light with Arduino and an Automatic Night Light
Learn how an LDR changes its resistance with light, how to connect it to Arduino with a voltage divider, choose the right resistor and build an automatic night light that doesn't flicker.
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ComponentsHow to Use an RGB LED: Color Mixing with Arduino, Common Anode vs Cathode
Learn how an RGB LED produces millions of colors from three LEDs in one package, how to tell common anode from cathode, pick the right resistors and blend colors smoothly with Arduino.
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ComponentsPIR Motion Sensor (HC-SR501): Motion Detection with Arduino, ESP32 and Pico
Learn how a PIR sensor detects human movement, how to set up the HC-SR501, connect it to Arduino, build a motion-activated light and prevent false alarms.
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Electronic Components Database
Sensors, boards, motors — hundreds of components and the projects they're used in.
Get Started Now
Download the BlueGrays app and bring your Arduino projects to life.
- 01Discover Arduino ProjectsBrowse projects from beginner to advanced. Each project includes step-by-step circuit diagrams, source code, video tutorials, and a full list of required components.
- 02Complete Component DatabaseExplore 150+ electronic components with detailed specifications, pin diagrams, and usage examples. See which components you've used and add them to your workshop.
- 03Workshop & Achievement SystemManage your component inventory, get smart project recommendations based on parts you own, and earn badges as you level up your maker skills.
