In the crowded world of capacitive humidity sensors, the YL105 is often misunderstood. Viewed by beginners as a "cheap alternative," this sensor module—when paired with a correct reading of its datasheet—offers a superior price-to-performance ratio for 80% of DIY and commercial IoT projects.
The YL105 designation covers multiple components, primarily serving as a 5V-to-3.3V adapter board for nRF24L01+ modules, a PIR motion alarm, or a residual chlorine sensor, depending on the context. The widely used adapter board incorporates an AMS1117-3.3 regulator and features an 8-pin socket for seamless integration with 5V microcontrollers like Arduino. For technical specifications regarding the adapter board, visit Infrared Motion Sensor Alarm YL-105 Instruction Manual yl105 datasheet better