10PCS OSOYOO Obstacle Avoidance Sensor Kit with IR Transmitting, Receiving Tube, and Photoelectric Switch for Arduino, Raspberry PI 4, 3 Model B - Ideal for Smart Cars and Robots Review

These things are cheap and work great, detecting an object within about 3 inches. The output is the same voltage as whatever you use to power the board. So if you connect VCC to 5 volts, the output will be 5 volts. This caused problems with the D1 Wemo's digital input. When I applied 3 volts to the infrared sensor, its output was 3 volts and it worked fine.

I have found that these sensors have a very short range. An object must be approximately 2 to 3 inches from the sensor before it is detected. I installed them on a small robot but found that the robot would bump into something before the sensor detected it. Also, the Python code was hard to come by and works fine while you're testing it, but not in actual use. The price was reasonable and one day I will need them.

These sensors work as described. The distance accuracy is slightly different. Although the description says it works between 2cm and 30cm, I was able to test it in my lab and found that the minimum distance I can set is about 1/4 inch (6mm) and the furthest about 10 inches (254mm). . This is acceptable for my application. but the performance is consistent and reliable. I will be buying again once the first 10 I just received are gone.

These boards have a 100 ohm current limiting resistor. Assuming a 1.2V, 20mA IR LED, a 190Ω resistor is required when 5V VCC and 105Ω at 3.3V VCC. This is why such a high failure rate is too much current for an LED at 5V. Solution: Either use 3.3V VCC or replace the 100 ohm resistor (marked 101 on the resistor) with a 200 ohm one -Resistance. I did the latter and the LED lived for 4 days while the original died after one day.

They are finicky to set up and extremely sensitive to natural light, even indirectly. The slightest thing but the light from outside keeps them on. While they relied on pulses of a specific frequency so they only picked up their own output, it only seems to pick up any IR light. They also have a very high bounce rate. When buying, they recognize up to 3 cm. After an hour or two of use, at least 3/10 are degraded and can only see about 0.5 cm.

As mentioned by other customers, these modules often fail. The short answer to this problem is "Don't connect them to the 5V pins of an Arduino or Raspberry Pi." A more detailed explanation is that one astute reviewer noted that the resistance in the device appears to be smaller than the LEDs. can withstand 5 volts, but 3 volts is enough. My experience has been that I plugged a device into an Arduino Uno and couldn't get it to respond. All he did was stay "on" the whole time. Thinking I might…

I have to agree with others on the high failure rate of this product. They seem to be working at first, but I've only bought 20 sensors and only 6 are still working (4 of which have not been used yet). I used them with an Arduino project; I powered them directly from the Arduino (5V output) and after a few days of work (2-4 days) the sensors failed - this happened several times. (See my theories on this below.) HOW THEY (SHOULD) WORK: Sensors reflect IR light off an object and trigger an output