The "YL" prefix indicates the manufacturer or PCB designer family (often associated with generic Chinese sensor modules), but the underlying sensor follows the standard specifications.
A compact footprint of 26 x 18.6 x 10mm and a weight of roughly 3g . yl-105 datasheet
| Symptom | Likely Fix | | :--- | :--- | | Digital output never changes | Adjust the potentiometer (too sensitive or not sensitive enough). | | Detects only at 2mm distance | You need a 10k pull-up resistor on the DO pin (open-collector output). | | Onboard LED always on | The potentiometer is set too high; turn it counter-clockwise. | | Erratic readings on white surface | Add a 10µF capacitor between VCC and GND near the sensor. | The "YL" prefix indicates the manufacturer or PCB
Because it is a generic Chinese module, there isn't a single official manufacturer datasheet like you would find for a major IC (e.g., from Texas Instruments). However, the module is built around a specific RF chip, and its specifications are well-documented in hobbyist electronics. | | Detects only at 2mm distance |