Revision as of 23:18, 18 January 2012 (view source) Katja (Talk | contribs) (→Valves in sync with motion sensing) ← Older edit		Revision as of 23:20, 18 January 2012 (view source) Katja (Talk | contribs) m (→Controlling valves & feeding external power) Newer edit →
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−	= Controlling valves & feeding external power =	+	== Controlling valves & feeding external power ==
	The valves are controlled individually with an Arduino.		The valves are controlled individually with an Arduino.

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Revision as of 23:20, 18 January 2012

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Arduino development

Valves in sync with motion sensing

In the first video the valves happily click away in the rhythm of the movement in the room. The second video has all the effects; air pump is buzzing in the background, and air is hissing out of the valves in between the clicks.

Controlling valves & feeding external power

The valves are controlled individually with an Arduino.

Pseudocode for controlling the air valves

Light sensor is in the place of motion sensor. Green led is the air OUT valve, the red is air IN. Air pressure is not measured, but it is a variable, that is changed by "letting air in / out".

Yellow led in the middle represents the air pressure. Bright: high pressure (cushion filled with air). Dim: low pressure (minimum pressure in the cushion).

When there is movement (light on the sensor), more air is pumped in (red led on). Otherwise the other valve starts to let air out (green led on).

See the arduino code

Pumps

Bristol (18e): Elektro-Pumpe HB-135 C, AC 230V - 50 Hz, 95W

Power sources

• 9V external adpter (worked with two valves)
• 5V Nokia adapter (worked with two valves)

Measuring voltage with a multimeter

Pressure sensors

Stretch

conductive thread or wire, or conductive stretching textile

Stretch (conductive paint)

Conductive paints and inks

based on resistance difference when the canvas is stretched

Pressure / Bend

Air Flow

Flow rate by volume Converter

Air weight: in 20oC - Density (ρ)(kg/m3) 1.204 - γ (N/m3) 11.81 in 25oC - Density (ρ)(kg/m3) 1.184 - γ (N/m3) 11.61