OSOYOO 10PCS IR Obstacle Avoidance Sensor Module for Arduino Smart Car Robot Raspberry Pi 5 4 3 Model B with IR Transmitting, Receiving Tube, Photoelectric Switch

These things are cheap and work fine to detect an object within about 3 inches. The output carries the same voltage as whatever you use to power the board so if you connect VCC to 5 Volt the output will be 5 volt. This caused problems on the digital input on a D1 Wemos. When I powered the infrared sensor with 3 volts its output was 3 volts and it worked fine.

These sensors perform as described. The range accuracy is a little different. Even though description indicates it operates in the range between 2cm and 30cm, I could test it in my lab and found the minimum distance I could set it up is around 1/4" (~6mm) and the farthest is around 10" (~254mm). For my application, this is acceptable. but performance is consistent and reliable. I will buy again as soon as I run out of these first 10 I just got.

These are a good value and work well for the projects I have made.

These sensors work great, no problem at all. The adjustable pot to set the range is a little sensitive, but still fine. Im using these sensor the trigger signal lights on a model railroad.

As has been mentioned by other purchasers, there seems to be a high failure rate with these modules. The short answer to this problem is "Don't connect them to the 5 volt pins of an Arduino or a Raspberry Pi."A longer explanation is that an astute reviewer noted that the resistor in the device seems to be smaller than the led can safely tolerate at 5 volts but is sufficient for 3 volts. My experience was that I plugged the device into an Arduino Uno and could not get it to respond. All it did was stay "on" all the time. Thinking maybe I was doing something wrong with the Arduino, I tried the module with a Raspberry Pi and got the same results.After some research, I discovered the note about the resistor being too small for a 5 volt supply. To test this I connected a new module to the 3 volt power pin on the Raspberry Pi and it worked as described. I let it run for 24 hours without any issue and also tried several additional modules in the same batch. All of them worked as specified. CONCLUSION: It appears that the LED burned out as soon as I plugged it into the Arduino 5 volts power.The lesson to be learned is that modules are described as "Can be used for 3-5V DC power supply modules" but they won't last long at 5 volts.With all that said, this is an inexpensive way to implement a proximity trigger on a Raspberry Pi provided you use the 3.3 volt pins.

These worked well to control signal lights on a train layout. They are adjustable to a distance of about 2.5 inches, switch very quickly and are not affected by ambient light.

All ten tested good. Range is between 1/16" to 1 1/2" with the adjustment pot.

I've been using these as proximity sensors with a NodeMCU. At first they worked OK: the adjustable sensor distance is a nice feature and they were more or less accurate in determining the presence of a plastic ball within a distance of a few centimeters.Over the last month, 4 out of the original batch of 10 have failed for inexplicable reasons.