Sensors

Rotary encoders are soooo much fun! Twist em this way, then twist them that way. Unlike potentiometers, they go all the way around and often have little detents for tactile feedback.

Vishay has a lot of light sensors out there, and this is a nice simple lux sensor that's easy to add to any microcontroller. Most light sensors just give you a number for brighter/darker ambient lighting.

The Adafruit LIS3DH Accelerometer Breakout packs low-power consumption, flexible I2C/SPI connectivity, and advanced motion detection into a compact, STEMMA QT-ready board—perfect for wearables, motion sensing, and battery-powered projects.

Sensirion Temperature/Humidity sensors are some of the finest & highest-accuracy devices you can get. The SHT41 sensor is the fourth generation of I2C temperature and humidity sensor from Sensirion.

Non-contact liquid level sensor for Arduino, using a high-speed chip for toxic or high-pressure liquids. Compatible with Gravity interface, with adjustable sensitivity.

This infrared obstacle/object detection sensor is super easy to use. It comes with a potentiometer to adjust the sensitivity. The output is a digital signal so it is easy to interface with any microcontroller such as Maker UNO, Mega, Leornado, Zero, 101, or even the Raspberry Pi or Raspberry Pi Zero.

The Decoy Trigger handles the complex "handshake" conversation between a power source and a device. By mimicking the signals of a high-end smartphone, it tells the charger to switch from the standard 5V up to 9V, 12V, 15V, or 20V.

Bosch has been a leader in barometric pressure sensors, from the BMP085. BMP180, and BMP280... now we've got the next generation, the Adafruit BMP388 Precision Barometric Pressure sensor.

This is low cost LDR (Light Dependent Resistor). Basically it is a light sensitive resistor, the resistance will decrease when the surface is expose to light. It is widely used to detect Day or Night, example in automatic car porch light.