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September 26, 2014 AT 10:00 am

Raspberry Pi Goblin Detector #piday #raspberrypi @Raspberry_Pi

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This is a cute Halloween project for kids made using a Raspberry Pi. Via Raspberry Pi Pod. Read the full tutorial here.

A Python programming project for the Raspberry Pi together with the Pibrella add-on, plus a standard passive infra-red (PIR) movement sensor, for the Raspberry Jam at PyCon UK 2014. Also suitable for other 3-wire sensors.

My eight-year-old daughter Annabel’s bedroom is plagued by goblins (her five-year-old sibling twins). Annabel and I created a Goblin Detector, which guards her bedroom while she’s out, like a burglar alarm. If it detects movement, it sounds a buzzer. We used the Pibrella add-on to make the wiring easier, to give us some lights, a button and a buzzer ready-to-go.

  • 1x Raspberry Pi – any model A, B v1, B v2, B+ – around £25.
  • 1x Pibrella – £10
  • 1x HC-SR501 PIR Motion Sensor Module – should be around £3-£5 from eBay. Teachers – look out for listings with bulk discounts for 3, 5, 10 sensors; I’ve seen ten for under £10 if you’re prepared to wait for delivery from China.
  • 3x Male to Female Jumper Wires – usually supplied as a coloured strip of 40 or so for about £2-£4
  • 1x small empty clean margarine tub – optional, to house the sensor.
  • A case, optional. I used the Pibow Coupé (£8.50) which gives easy access to the GPIO pins but there are many cheaper alternatives or even a paper/card case for the model B and for the B+ that you can print out for free (remember to select the “actual size” option when you print).

Read more.

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