Yl-105 Datasheet May 2026

Since no official YL-105 datasheet exists, here are the actual technical specs you need for circuit design and coding.

| Parameter | Value | | :--- | :--- | | Operating Voltage | 3.3V to 5V DC (5V recommended) | | Current Consumption | 15mA to 20mA (LED + IC) | | Output Type | Digital (0 or 1) + Analog (varies by reflection) | | Comparator Chip | LM393 (Open-collector digital output) | | Detection Range | 1mm to 15mm (optimal: 3-5mm for lines) | | Output Logic | Active LOW (0 = Object/White surface detected) | | PCB Size | Approx. 31mm x 14mm |

| Feature | YL-105 (Analog + Digital) | KY-003 (Magnetic Switch) | US1881 (Latching) | |---------|----------------------------|---------------------------|-------------------| | Output Type | Digital + Analog | Digital only | Digital (latching) | | Sensitivity Adjustment | Yes (potentiometer) | No | No | | Detectable Field Polarity | South pole only | South pole only | Both poles (latches) | | Best for | Adjustable proximity, RPM | Simple ON/OFF | Rotary encoders, door locks |

The YL-105 wins for flexibility due to its analog output and adjustable trigger point.

Read the AO pin with an ADC. The analog voltage will change as a magnet moves parallel to the sensor face. Calibrate the ADC reading to distance. This is not a high-precision linear encoder, but it works for coarse position feedback (e.g., throttle position, linear actuator feedback). yl-105 datasheet

Search the web or a marketplace (Amazon, AliExpress, eBay) for "YL-105 module". Look at the listing title to see what it detects. Common YL modules include:

| Module Code | Typical Function | |-------------|------------------| | YL-105 | Possibly temperature sensor (NTC thermistor + LM393) or laser receiver module? (Unconfirmed) | | YL-69 | Soil moisture | | YL-83 | Rain/water drop | | YL-38 | Metal touch sensor |

If you find a seller listing YL-105 as a "laser sensor" or "photoresistor module," that is your clue.

Because the YL-105 acts like a digital switch, wiring is simple. Since no official YL-105 datasheet exists, here are

Wiring:

Arduino Sketch:

const int sensorPin = 7;  // Digital input
const int ledPin = 13;     // Built-in LED
void setup() 
pinMode(sensorPin, INPUT);
pinMode(ledPin, OUTPUT);
Serial.begin(9600);

void loop() 
int sensorState = digitalRead(sensorPin); Arduino Sketch: const int sensorPin = 7; //
if (sensorState == LOW)   // Object or white surface detected
digitalWrite(ledPin, HIGH);
Serial.println("Detected!");
 else 
digitalWrite(ledPin, LOW);
Serial.println("Clear");
delay(100);

To read data from the YL-105, you do not need a specific library for the module itself, but rather a library for the protocol being used (e.g., RC Switch, VirtualWire).

Wiring:

Antenna: For the module to work effectively, you must attach an antenna.