HC-SR501 PIR Sensor Infrared IR Body Motion Module for Arduino Raspberry Pi(Pack of 5pcs)

These sensors did exactly what they were supposed to do. they were easy to hook up to an Arduino and use in a sketch.

very pleased, arrived on time, everything works

類似製品が多く迷ったのですが、価格もお手頃だったので購入しました。 商品到着後、早速使ってみましたが問題なく動作しました。 商品到着も早く、梱包も１個ずつ個包装されており、信頼できると思います。 また利用させて頂きます。

After a couple of decades, I decided to build some new life size figures using some of the latest sensors, relays, and motors. I'm using the HC-SR501 sensors to initiate the animatronics, and found a couple of issues. They work w/o issue, and will continue their use. I also wanted to incorporate a flame bulb that will go in the medieval torch I built out of PVC pipe/fittings, EVA foam, and modelling paste. Regardless of the input voltage, the HC-SR501 output trigger voltage is only 3.3V-3.4V DC. This means I can only use 5V DC opto-relays, instead of 12V opto-relays as their trigger voltage is >4.5V DC. This required making a 5V circuit to power the HC-SR501 and the relays. The video shows the DC-DC Buck converters (blue LEDs) and the 5V DC opto-relays (red LEDs) driving the HC-SR501, one motor, and the flame bulb. The simplified schematic shows the wiring layout I made with applied voltages. The second issue to note with the HC-SR501 is the delay pot. It only takes a 10 degree turn of the pot to go from the minimum delay time of one second to 25 seconds. Their sensitivity is very good. I have yet to try adding a thermistor to the HC-SR501 to test its night time capabilities. FYI: I'm using the B0CMXCZX9Y nylon standoffs (via Amazon) to mount all of these boards. UPDATE: I'm holding back from installing a thermistor. Low light sensitivity is excellent.

As per the HC-SR501 data sheet, stops detecting ("detection range is shorter") as temperature approaches 30 degrees celsius (approximately 90 degrees fahrenheit). These units have the through-holes to add a thermistor to improve high temperature performance, if one has a thermistor to add. The real test is if starts detecting again when the temperature drops. I plan to drop my score one star for each unit that permanently fails on me. Worked just fine the first three days I had it connected. Easy to set up. Pins fit well into female Dupont wires for prototyping.