LED - Yellow (5mm)
LEDStandard 5 mm indicator LED. Always use it with a series resistor.
Specifications
- Colour
- Yellow
- Diameter
- 5 mm
- Forward voltage
- 2.0-2.3V
- Forward current
- 20 mA (max. 30 mA)
Shop prices
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Projects with this part
Traffic LightBeginner20 minA real traffic light with three LEDs: red, red + yellow, green and yellow light up in the order used in Turkey, and each stage is also written to the Serial Monitor. It teaches driving several outputs in turn, timing with digitalWrite and delay, and gathering a repeated job into its own function. You can change how long each light stays on with the constants in the code. No extra library needed.Open project 
Parking SensorIntermediate45 minLike the parking sensor in a car: the HC-SR04 measures the distance to whatever is in front of it, the buzzer starts beeping once something comes within 1 metre and the beeps get faster as it comes closer; below 10 cm the tone is steady. Green, yellow and red LEDs show the far, middle and near zones, and the distance is written to the Serial Monitor. It teaches timing with millis() instead of delay, so measuring, beeping and the lights run without waiting for each other, writing a function that returns a value, splitting into zones with if / else if, and turning the distance into a beep gap with map. No extra library needed.Open project 
Air Quality IndicatorBeginner30 minAn indicator that shows a room's air like a traffic light: the MQ-135 sensor reacts to pollutants such as smoke, ammonia, benzene and the CO₂ that builds up from breathing; green lights while the air is clean, yellow as it starts to get stale and red when it is bad, and the Serial Monitor tells you to air the room. At start the sensor warms up and the clean-air value is measured; every reading after that is judged against it, and if the air gets even cleaner the value is updated. It teaches reading an analog sensor against its own clean-air value, reducing jitter by averaging several readings and leaving a margin at the thresholds so the LEDs do not flicker at the edge. No extra library is needed. The MQ-135 does not tell gases apart and does not give a calibrated CO₂ reading; it shows roughly how polluted the air is.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