Blog

SMA Connector Types for Antenna Projects

Learn the key differences between SMA connector types and how to choose the right one for your antenna project, including edge mount and RP-SMA varian...

How to Test a PIR Sensor Module SR505

Learn to test the SR505 mini PIR sensor module step by step. Covers wiring, output voltage checks, and common troubleshooting tips for reliable motion...

M3 Nylon Standoffs vs Metal Standoffs: Which to Choose

Compare M3 nylon standoffs and metal standoffs for PCB mounting. Learn when insulation, cost, and vibration damping matter, and when strength and grou...

3mm LED Resistor Calculator for Arduino

Learn how to calculate the correct current-limiting resistor for a 3mm LED used with Arduino, including a step-by-step process and common pitfalls.

IDC Headers and Ribbon Cables: A Practical Selection Guide

Match IDC headers and ribbon cable connectors to your project by pin count, pitch, and termination method, with clear rules for choosing 2x20 and 40 w...

Bullet Banana Connectors for Speaker and Bench Wiring

A practical buying guide to bullet and banana connectors for speaker and bench wiring, covering crimp vs solder, plating, pack sizes, and fit checks.

Shift Register vs I2C Expander: Adding Outputs to Arduino

Compare the 74HC595 shift register and I2C port expanders like the PCF8574 for Arduino pin expansion, with clear trade-offs and when to use each.

5V Relay Module With Arduino: Wiring, Triggers, Safety

Wire a 5V relay module to an Arduino, pick the right trigger type, and switch loads safely with a JD-VCC optocoupler setup and a simple sketch.

L293D Motor Drive Shield: Run Two DC Motors and a Servo

Wire an L293D motor drive shield to an Arduino Uno, power the motors externally, and control two DC motors plus a 5V servo with a practical step-by-st...

4x4x4 LED Cube Kit Build: Soldering Tips and First Tests

Build the 4x4x4 V2 LED Cube Kit step by step: solder the 64-LED cube, check for shorts, and run the pre-flashed animations. Includes beginner solderin...

MPU-6050 GY-521 Not Reading? Fix Common I2C Problems

Debug a GY-521 MPU-6050 that returns no data over I2C: check wiring, run an I2C scanner, confirm address 0x68, and solve 3.3V level issues.

WeMos D1 mini Shields Buying Guide: Match Shield to Project

Pick the right WeMos D1 mini shield by project type, not price. Compare the prototyping shield and relay shield, plus stack and compatibility rules.