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	=<span style="color:gray">Arduino development</span>=		=<span style="color:gray">Arduino development</span>=
−	http://www.youtube.com/watch?v=bXqKIyhWIoI&feature=youtu.be	+	== 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.
		+
		+	<youtube width="530" height="400" left >kXOMyJp_Jcs</youtube>
		+
		+	<youtube width="530" height="400" left >Qv0npf21Kjs</youtube>
		+
		+	== Controlling valves & feeding external power ==
		+	The leds blink in sync with the valves opening and closing. External power from single 9V source is feeding the valves, but the operating power is controlled individually with an Arduino.
		+
		+	<youtube width="530" height="400" left >8U1lmQk2ZIo</youtube>
		+
		+	==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".
		+
		+	<youtube width="530" height="400" left >bXqKIyhWIoI</youtube>
		+
		+	<span style="background:yellow">Yellow</span> 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 (<span style="background:red">red</span> led on). Otherwise the other valve starts to let air out (<span style="background:green">green</span> led on).
		+
		+	[[project_F:Arduino/Movement_AirPressure| See the arduino code]]
		+
		+	= Pumps =
		+
		+	Summertime 230V, 2000 liters/minute, 50 Hz, 840W,
		+
		+	compressor 240 liters/minute, 8 bar
		+
		+
		+	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)
		+
		+	[http://www.ladyada.net/learn/multimeter/voltage.html Measuring voltage with a multimeter]
		+
		+	= Pressure sensors =
		+
		+	[http://www.kobakant.at/DIY/?p=1781 Stretch]
		+	: conductive thread or wire, or conductive stretching textile
		+
		+	[http://www.kobakant.at/DIY/?p=1836 Stretch (conductive paint)]
		+	: [http://www.kobakant.at/DIY/?p=634 Conductive paints and inks]
		+	: based on resistance difference when the canvas is stretched
		+
		+	[http://www.instructables.com/id/Stickytape-Sensors/ Pressure / Bend]
		+
		+	= Air Flow =
		+
		+	[http://www.convert-me.com/en/convert/flow_rate_volume 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

---

Latest revision as of 16:06, 1 February 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 leds blink in sync with the valves opening and closing. External power from single 9V source is feeding the valves, but the operating power is 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

Summertime 230V, 2000 liters/minute, 50 Hz, 840W,

compressor 240 liters/minute, 8 bar

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