Less searching.
More building.
Pin maps, wiring essentials and code you’ll reach for again and again. Your robotics reference library, one cheatsheet at a time.
Arduino Uno R3
The reference collection
26 cheatsheets to explore
Arduino Uno R3
The classic 5 V board: pins, power and the three essential buses.
Arduino Nano
A breadboard-friendly pin reference for the classic ATmega328P Nano.
ESP32
A functional GPIO map for the original ESP32-WROOM development boards.
Raspberry Pi Pico
GPIO functions and header positions for the original RP2040 Pico.
HC-SR04
Turn an echo pulse into distance, with the level shifting that matters.
IR Sensor
Reflective obstacle-module wiring and a repeatable calibration routine.
DHT11 / DHT22
Temperature and humidity wiring, sampling intervals and valid readings.
MPU6050
I2C connections, scale factors and the six axes of robot motion.
LDR / Photoresistor
Build a light-sensitive divider and turn ADC readings into thresholds.
SG90 Servo
Three wires, a control pulse and a power supply that can handle motion.
DC Motor
Direction, speed and the difference between running and stall current.
Stepper Motor
Identify coil pairs and wire a bipolar stepper to a STEP/DIR driver.
Buzzer
Choose the right signal for active buzzers and passive sounders.
L298N
Dual H-bridge connections, direction logic and module jumper cautions.
L293D
The 16-pin DIP H-bridge: power domains, paired outputs and enable logic.
TB6612FNG
Efficient dual motor control with an essential standby pin.
I2C
Two shared signal lines, device addresses and compatible pull-ups.
SPI
A shared clock and data bus with a separate chip-select for each device.
UART
Cross TX and RX, share ground and agree on the serial format.
Resistors & LEDs
Read polarity and choose a resistor before lighting your first LED.
Breadboard
Know which holes connect before troubleshooting your circuit.
Transistors / MOSFETs
Switch a larger DC load with a low-side transistor circuit.
Arduino C++
The core I/O calls and a non-blocking timing pattern you can reuse.
MicroPython
GPIO, ADC, PWM and I2C essentials for a Raspberry Pi Pico.
Robot Not Working?
A calm, ordered checklist to find the first failing subsystem.
Power & Grounding
A reliable power layout for mixed logic, sensors and motors.
A quick reference is just the beginning. Explore the full tutorials