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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: http://cyberdoll.free.fr/cyberdoll/index_f.html 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

mic_sensor.jpg

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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