project F:Realisation-f
Design Realisation Relationships
Design Execution Prototype Validation Arduino development 1:1 Prototype
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).
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
- conductive thread or wire, or conductive stretching textile
- Conductive paints and inks
- based on resistance difference when the canvas is stretched
Air Flow
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
