PIR Motion Sensor Testing

Today was the first day of our residency at Rustines | Lab at Perte de Signal (Montréal). We ran a small experiment using Sparkfun's PIR Motion Sensor. The setup was built using an Arduino board and plays a tone with a piezzo everytime the PIR is activated.

The PIR is plugged into digital I/O #2 using a 1K pull-up resistor. The piezzo is plugged into the #9 (PWM).

Residency at Rustines | Lab

From April 14 to May 9, we will be in residency at Perte de Signal's Rustines | Lab to work on Accrochages.

Rain-powered devices?

French scientists have found a way to generate electricity from rain to power small devices.

See this video reportage from National Geographic.

Extracts from an article published on Thaindian News:

It may even be combined with solar power to extract as much energy from the environment as possible

Sound playback

Sam, as I told you earlier there's a way to encode/playback audio using 1 bit... I sadly cannot find the link back: it's dead... See this post from my sound project at PZI, there might be a few ideas up there.

France Cadet: lucioles

Interesting link, a project by French artist France Cadet, see her website: There's a project there called "Lucioles électroniques" that's very close to the Synchronizing Fireflies project. Pretty cool stuff.

ATtiny13 test/developement module

Le module de développement Attiny13 (compatible Attiny12,13,22) a été conçu pour faciliter la programmation in situ. Grâce au programmeur AVR ISP* alimenté par USB et le module de développement allimenté par une pile 9 volts, les modules pouront être mise à jour sur place (extérieur). Uniquement le microprocesseur doit être déplacé de son socle pour télécharger les nouvelles données.

Range experiments

We have run a battery of tests on IR Leds and emitter circuits to verify different ways of increasing the distance. According to most sources, the distance is a function of the intensity of the emitting LED. Ways to increase the intensity are:

  • choose a stronger LED
  • lower the resistance between alimentation and LED
  • increase the voltage

Our experiments (see attached files) have led us to the following conclusions:

A few links about IR emitter/receiver

Here are a few tutorials or information pages about infrared emitter/receivers:

Little Radio Hacking

I bought a small FM radio at the local Dollarama for 1 CAD. It has a volume knob / switch and three buttons: reset (I dunno what this is but I guess it resets to the first channel on the FM band), scan (goes to the next available channel) and light (activates a small light).

Experiment with microphone sensor and ATTINY


The microphone sensor detect noise activity (5 meters). We can change the amplitude buffer by changing the capacitor value. The mic react by the airwave modulation.

  • The sensor could recognize a hand clap ( high amplitude, short time wave)
  • The repetitive sound like persone walking hard.

We can add filter (capacitor and resistance(not on photo))to reach specific frequency sound

  • Bass sound from truck passing or ghettoblaster !!
  • High sound like whisle, child laughing
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