HC-SR501 Passive IR PIR Sensor


43 in stock

This is an easy, simple to use Passive IR sensor – it only needs a single I/O pin on a microcontroller.

  • Working voltage: 5V to 20V
  • Output: High: 3.3V, Low: 0V
  • Detection angle: Approximately 120 degrees
  • Range: Adjustable, up to 7m
  • Ground: Connect to your Ground or 0V
  • Output: High 3.3V – Low 0V
  • 5-20V: Connect to your power supply positive voltage – between 5V and 20V
  • Detection Range: 7m Approx.
  • Detection Angle: 120 Degrees Approx.

The solder pads allow you to choose if the output should automatically reset itself after it is triggered. If set to Auto-reset the sensor will stay high until the motion stops. After motion is no longer detected the output will go low after the preset time period. If set to No reset the sensor will stop sensing once it has triggered, and stays high for the preset time period. To choose one of these settings, simply create a solder-bridge between the labelled pad and the pad in the middle.

The potentiometer labelled Sensitivity allows you to select the distance that the sensor will work over. It can be varied from approximately 3m to 7m.

The potentiometer labelled Output timing adjusts how long the output is held high after the sensor is triggered. This can be varied from approximately 5 seconds to 300 seconds.

Everyone our these sensors are tested prior to despatch to ensure they arrive in full working order.


Please read and note the following before ordering:
1) My Shipping is for UK Mainland ONLY. No Scotish Highland, Northern Ireland, Isle of Wight or other Isles. Some areas may incur additional costs, if you are unsure please contact me prior to ordering.
2) Please ensure you have a valid contact phone number, I may pass this number onto the Carrier for delivery. No refund for carriage cost will be offered, if delivery is delayed as a result of no valid contact number being provided.
3) I welcome collection for orders,please select collection on checkout otherwise your order will be despatched. Once your order has been picked and tested if applicable. We will then inform you of a date and time for collection. Please bring your payment card for verification when collecting your order. No order will be released without card verification.
4) I am unable to provide ANY technical support, please ensure you fully understand how this item works by checking for any datasheets (not provided with the item), to enable the product to be used within your application / project.
5) VERY IMPORTANT >> Do not make ANY permanent connections. Please test the item BEFORE making any permanent connections e.g. soldering to the item. Please ensure you have the means to test the item WITHOUT applying ANY solder to the item. If an item has any solder applied I will NOT accept any return.
6) When upgrading to 1st class post, (if the option is available), please note this is sent via Royal Mail and is not a guaranteed next day service. If you need a 48hr courier service please select courier delivery. No weekend or public bank holiday deliveries.
7) We attempt to send out all orders received before 12.00pm. This excludes weekends and public holidays.
8) Customers placing multiple orders. – I may ship all the orders as one, please do not ask for a refund of shipping cost after you have placed your orders. Please do not place your orders if you want a refund of shipping cost.
9) Some items may have a "Warranty Void if removed" sticker, please DO NOT tamper or remove these stickers. I will not accept any rertuns with tampered or removed sticker. Some buyers have tried to send back items that I have not supplied.

**** Important note **** Some sellers claim the stock is in the UK, please be careful, the seller is often in China and sends the item to a UK agent who then forwards the item on with a UK stamp. Check where the seller is located not just the item location. All my items are physically with me, here in the UK and I offer a quick delivery and communication within the UK.

During busy periods there maybe a delay in delivering your package by Royal Mail. I apologies in adavnce for any inconvenience but would like to point this out before you place your order.