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

The media could not be loaded. 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.

I haven't used them yet sorry

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。

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

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.