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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.
Adafruit VL53L4CX Time of Flight Distance Sensor - ~1 to 6000mm - STEMMA QT / Qwiic (Ada VL53L4CX Stemma)
The Adafruit VL53L4CX Time of Flight Sensor is another great Time of Flight distance sensor from ST in the VL5 series of chips, this one is great for long distances - it goes up to 6 meters compared with 4 meter max of the VL53L1X.
Adafruit Right Angle VEML7700 Lux Sensor - I2C Light Sensor - STEMMA QT / Qwiic (Ada VEML7700 Lux StemmaQT)
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.
Adafruit LIS3DH Triple-Axis Accelerometer (+-2g/4g/8g/16g) STEMMA QT /Qwiic (Ada LIS3DH Accelerometer STEMMAQT)
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.
Adafruit Sensirion SHT41 Temperature & Humidity Sensor - STEMMA QT / Qwiic (Ada SHT41 STEMMA QT)
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 Digital Liquid Level Sensor for Arduino (Non-contact Liquid Level)
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.
Infrared Obstacle Avoidance Sensor (IR detecter 1 channel)
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.
DS18B20 Temperature Sensor TO-92 (DS18B20 Temperature Sensor)
Temperature measurement range: -55°C ~ +125°C