I would like to buy a PIR motion detector circuit. Any circuit diagrams to help me out? I dont need complicated ones where u can adjust etc, just need it to be simple.
At work they bought for the warehouse loading dock a RadioShack PIR motion detector that made a terrible-sounding, square-wave "DING-DONG". Its range was about 20m and it scanned about 60 degrees in width or more. Its detector was pretty big and was diffused and maybe had a fresnell lens inside. It would detect people very well but wouldn't detect a ball nor a cat.
Not at any reasonable cost - you can buy them ready made for almost nothing, far less than you could buy the components. Look for burglar alarm sensors, or sensors for outside lighting.
find a security installer & he'll probably give you an old one that works ok. open it up & there will be a terminal stip with +&- 12v to power pir , a set of tamper contacts for the pir casing & either SPST or SPDT relay contacts. keep in mind that these contacts are only rated at about 500mA and usually have a 40ohm resistor in series
I saw the motion detector circuit (from the site).could you confirm :
- whether the relay will be permanently active after motion detection.If not for how long ?
- PIR is with fresnel lens attached?
- PIR part No. details
You can buy the components seperately and then make it ( i got all mine from Bitsbox Electronic Components), i made one for about £4 (about $7.50) including the PIR, here is an example circuit https://www.electro-tech-online.com/custompdfs/2010/01/pirdetect.pdf, if u want to connect it to a fan instead of putting an LED output, just connect it to the fan, if you want to put 12 V you may need to place a large capacitor across the output.
Hope this Helps