Frienda 20 Pieces IR Infrared Obstacle Avoidance Sensor Module 3-Wire Reflective Photoelectric Sensor Module Compatible with Arduino/Raspberry Pi 3/Smart Car Robot

great

Excellent value, at less than 50 pence per sensor when I bought them. I haven't used all of them, but the dozen that I have used all worked reliably and to specification. I just have them dotted around a self navigating robot for collision avoidance and to help with alignment when driving in to it's recharging nest.

The media could not be loaded. Bought a box of these boards and although there are no instructions provided you just need to hook up the module to power and ground plus an digital input line of your processor board. I used a spare AI Thinker ESP8266 MOD board to test and my Arduino IDE sketch is shown running in attached video. Note the detection works as the inverse of what you might be expecting so digital zero is output when a reflection is detected, digital 1 is output otherwise. My demo sketch shown below:/*demo infra red module on an ESP8266 boardsensor output pin connected to D8*/const int SENSORPIN = D8;void setup() {Serial.begin(115200);pinMode(SENSORPIN, INPUT);}void loop() {int d = digitalRead(SENSORPIN);Serial.println(d);if (d == 0 ) {Serial.println(" DETECTED");}delay(200);}

For a model railway project, have used before and happy to buy again

Received Order in Very Good time.All were then Tested and ALL were found to work just fine, with good sensitivity adjustments too.This is my 2nd batch and I will buy more in the future.All round GOOD PRODUCT and SERVICE.

Range is stated to be 2-30cm lucky to be 5cm maximum. So far 7 have failed after 10 minutes can the seller please contact me this is unacceptable

These items worked as expected but the sensors are too large for my purposes. There are smaller types out there which I now know would suit me better.

For my needs they are just the job