Jumper Wire - Male/Female
WireConnects a breadboard to a module or pin header.
Specifications
- Connector
- Male-Female
- Pin pitch
- 2.54 mm
- Wire gauge
- 24-26 AWG
- Typical length
- 20 cm
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Projects with this part
DHT11 Temperature and Humidity MeterBeginner20 minA starter project that measures the room's temperature and humidity with a DHT11 sensor and writes the values to the Arduino IDE's Serial Monitor once a second. Before uploading the code, install the DHTlib library in the Arduino IDE.Open project 
DHT22 Temperature and Humidity MeterBeginner20 minA project that measures humidity and temperature, in both Celsius and Fahrenheit, with a DHT22 sensor and writes them to the Serial Monitor every two seconds. It is more precise than the DHT11 and has a wider measuring range. Before uploading the code, install Adafruit's "DHT sensor library" in the Arduino IDE (and the "Adafruit Unified Sensor" library it asks for).Open project 
HC-SR04 Ultrasonic Distance MeterBeginner20 minA project that measures the distance to the object in front of an HC-SR04 ultrasonic sensor in centimetres and writes it to the Serial Monitor about 10 times a second. The sensor measures how long the echo of its sound wave takes to come back; the code turns that time into centimetres by dividing it by 58. No extra library needed.Open project 
Alcohol Measurement with the MQ-3 SensorBeginner25 minA project that measures alcohol vapour in the air with an MQ-3 gas sensor and writes the analog value and the threshold state to the Serial Monitor every half second. The analog value (0-1023) rises as the alcohol concentration goes up; the Limit value shows whether the threshold set with the trimmer on the board has been crossed. No extra library needed. The sensor's heater gets warm while it runs; on first use, leave the sensor powered for a while (ideally 24 hours), and let it warm up for a few minutes before measuring. The code uses 115200 baud, so pick 115200 in the Serial Monitor too.Open project 
LPG Gas Measurement with the MQ-5 (PPM)Intermediate30 minA project that reads the MQ-5 gas sensor's analog output, turns it into a voltage and the sensor's present resistance (Rs), measures Ro itself in clean air at start-up, and writes an estimated LPG concentration (PPM), worked out with the LPG curve in the MQ-5 datasheet, to the Serial Monitor every two seconds. At start-up it waits 10 seconds for the heater to settle, then calibrates for 5 seconds: the sensor must be in clean air then, with no gas near it. In clean air the Rs/Ro ratio is about 6.5 and the PPM below 1; with gas around, the ratio drops and the PPM rises clearly. The PPM value is an estimate: by its datasheet, a new sensor gives steady readings only after more than 24 hours of heating on first use. No extra library needed.Open project 
Level Measurement with a Water Level SensorBeginner15 minA starter project that reads the water level sensor's analog output and writes the level as Empty, Low, Medium or High to the Serial Monitor once a second. As the sensor's parallel tracks go under water, the resistance drops and the reading rises. The thresholds (100, 400, 450) depend on the water's conductivity and the sensor; watching the raw values first and setting your own thresholds gives better results. Only dip the lower part with the tracks in water; keep the electronics and pins at the top dry. To reduce corrosion, do not leave the sensor powered all the time. No extra library needed.Open project 
Colour Detection with the TCS3200Intermediate30 minA circuit that tells the colour of an object held in front of it. The TCS3200 board measures light through red, green and blue filtered photodiodes and puts out the chosen colour's strength as a square wave; the Arduino times the three colours' pulses with pulseIn, prints them to the Serial Monitor and names the strongest. It teaches choosing a filter with digital pins and timing pulses. No extra library needed.Open project 
LCD ThermometerBeginner30 minA small device that shows temperature and humidity on a 16x2 LCD instead of the Serial Monitor, so it can sit on a desk without a computer. The DHT11 is read every two seconds; the top line of the screen shows the temperature and the bottom line the humidity. It teaches driving a screen over I2C with just two data wires, using two libraries together, and updating a line on the screen without clearing it. Install the "LiquidCrystal I2C" and "DHTlib" libraries from the Library Manager.Open project 
Motion AlarmBeginner25 minA small home alarm that goes off when someone walks in: the HC-SR501 PIR sensor senses the change in the heat a human body gives off, the buzzer plays a two-tone siren and the red LED blinks; every alarm is counted in the Serial Monitor. It teaches reading a sensor's digital output, catching only the moment motion starts, sounding for a set time with millis(), and gathering the job into its own function. No extra library needed.Open project 
OLED Distance MeterIntermediate40 minA meter that shows the distance measured by an HC-SR04 on a 0.96" OLED screen, no computer needed: the distance in large text on top, and below it a bar graph of the last 128 readings scrolling to the right. Move your hand closer and further and watch the graph rise and fall. It teaches driving a screen over I2C, drawing text and lines with Adafruit GFX, keeping readings in a ring buffer, and timing with millis() instead of delay. Install the "Adafruit SSD1306" and "Adafruit GFX" libraries from the Library Manager.Open project 
Smoke and Gas AlarmIntermediate35 minAn alarm that goes off when smoke or a flammable gas (LPG, natural gas, methane) shows up in the kitchen or a room: the MQ-2 sensor's analog output is read, the clean air value is measured at start-up, and once the reading rises well above it the buzzer plays the three-beep pattern (T3) that real smoke alarms use while the red LED flashes with the beeps. The green LED blinks while warming up and stays on once the alarm is armed. It teaches reading an analog sensor against its own clean air value, using two separate thresholds so the alarm does not flicker at the edge, and playing a sound pattern with millis() while still taking readings. No extra library needed. This is a learning project; it does not replace a certified smoke and gas alarm at home.Open project 
Automatic Plant WateringIntermediate50 minA system that waters a potted plant by itself once the soil dries out: the soil moisture sensor measures moisture as a percentage, and when it drops below 30% the Arduino runs the mini submersible pump for 3 seconds through a relay, waits for the water to soak in, measures again and repeats until moisture passes 50%. The pump runs on three AA batteries of its own; the relay keeps that circuit fully apart from the Arduino. If 5 waterings in a row leave the soil dry, the tank counts as empty and the pump is stopped so it never runs dry. It teaches calibrating a sensor into a percentage, switching a separately powered load with a relay, powering a sensor only while it reads to slow its corrosion, and guarding a system against faults. No extra library needed.Open project 
Code Door LockIntermediate50 minA door lock that opens with a code typed on a 4x4 keypad: the LCD says what to do and shows the digits as *, and when the code is right the servo turns the latch and opens the door for 5 seconds while the screen counts down. After 3 wrong codes in a row the keypad is locked for 30 seconds. While the door is open, A changes the code; the new code is typed twice and saved in the Arduino's EEPROM memory, so it is kept even if the power goes. It teaches reading a keypad as a matrix, splitting a program into states (locked, open, waiting, changing the code), listening to keys while timing with millis(), and using memory that lasts. Install "Keypad" and "LiquidCrystal I2C" from the Library Manager; Servo and EEPROM come with the Arduino IDE. This is a learning project; do not use it as a real door's only lock.Open project 
RFID Card Door LockIntermediate60 minA door lock that opens with a card or key fob you have introduced: the RC522 reader reads the card's number, and if it is known the green LED lights up, a short beep sounds and the servo turns the latch and opens the door for 5 seconds; an unknown card lights the red LED and sounds a long beep. The first card you scan becomes the master card: scanning it opens adding mode for 10 seconds, and a new card scanned meanwhile is added, a known one removed. The cards are kept in the Arduino's EEPROM memory, so they are not forgotten when the power goes. It teaches talking to a module over SPI, comparing card numbers, keeping a small list in EEPROM, and letting a mode close by itself. Install "MFRC522" from the Library Manager; Servo and EEPROM come with the Arduino IDE. This is a learning project; do not use it as a real door's only lock.Open project 
Joystick Snake GameIntermediate45 minThe classic snake game on an 8x8 LED screen: you steer the snake with the joystick, and when it eats the blinking food it grows one cell longer, gets a little faster and the buzzer gives a short beep. The screen is small, so the snake leaves one edge and comes back in at the other; when it runs into its own body the game is over, three falling notes play, your score shows on the screen in digits, and pressing the joystick's button starts a new game. It teaches reading an analog joystick and turning it into a direction, keeping a game in arrays (the snake's cells), setting the game's speed with millis(), and driving a MAX7219 LED matrix with a few wires. Install "LedControl" from the Library Manager.Open project 
Kitchen TimerBeginner30 minA kitchen timer for tea, eggs or pasta: you set the time by turning the rotary encoder, and the 4-digit display shows it as minutes:seconds. Press the knob and the countdown starts, with the colon in the middle blinking once a second; press again to pause, once more to carry on where it stopped, and hold it down to go back to the time you set. When the time is up the buzzer beeps three times a second and the display blinks; a press silences it and the same time is ready to run again. It teaches reading a rotary encoder's direction with an interrupt, telling a short press from a long one on a single button, counting down with millis(), and driving a TM1637 display with two wires. Install "TM1637" (Avishay Orpaz) from the Library Manager.Open project 
Weather StationIntermediate40 minA small weather station for a room or a balcony: the BME280 sensor measures temperature, humidity and air pressure, and the Arduino works out the approximate altitude from the pressure. The readings show page by page on a 16x2 LCD; each press of the button turns to the next page, and the values refresh every two seconds. It teaches building an I2C line where two modules share the same two wires (SDA and SCL), working out altitude from pressure, and updating an LCD without flicker. Install "Adafruit BME280 Library" (with the extra libraries it asks for) and "LiquidCrystal I2C" from the Library Manager.Open project 
Flame-Sensing Fire AlarmBeginner30 minA fire alarm that recognises a flame by the infrared light it gives off: when the flame sensor sees a lighter or a candle flame, the buzzer plays a rising siren and the red and blue LEDs flash in turn like a fire engine's lights. While idle, the blue LED blinks briefly every 2 seconds to show the alarm is on watch. The alarm does not sound until a flame has lasted half a second, so a single spark or glint does not set it off, and it keeps sounding for 3 seconds after the flame is out. It teaches smoothing the on-and-off digital signal of a flickering flame, filtering out short flashes with a time condition, and playing a siren with millis() while reading the sensor. No extra library is needed. This is a learning project; it does not replace an approved smoke detector at home.Open project 
Waterproof Thermometer (Aquarium / Tea)Beginner30 minA thermometer that measures water temperature with a waterproof DS18B20 probe and shows it on a 4-digit display as "24°C". When the temperature leaves the allowed range the buzzer sounds and the display blinks: three fast, high beeps when too hot, a slow, low beep when too cold, so you can tell which by ear alone. It comes set to 23-28 °C for an aquarium; for tea, set the lower limit to 60 °C and it beeps once the tea has cooled enough to drink. It teaches 1-Wire communication and the pull-up resistor, not making the program wait while a reading is taken, and leaving a margin so the alarm does not flicker at the limit. The DallasTemperature and TM1637 libraries are installed from the Library Manager.Open project 
LED Control from Your Phone (ESP32 Wi-Fi)Beginner20 minThe ESP32 joins your home Wi-Fi and serves a small web page; with the ON and OFF buttons on the page you open in your phone's browser, you switch the LED from afar. No app to install: any phone or computer on the same network can open the page. The first step of smart-home projects: a relay, a motor or any other device is controlled the same way.Open project
In the app, tick off every wire, match the parts to your inventory and pick up where you left off.
Build it step by step in the app