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16.11 Using clear plastic tubing on standard adapters
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16.12 Using clear plastic tubing and 5/32 tubing
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Building the second mechanical device
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The second device is a lever (see Figs. 16.13 and 16.14). The lever I made is constructed out of wood and plastic. Machine screws secure the air muscle and rubber bands to the lever arm. A wood screw through the plastic arm is the pivot. A second wood screw holds both the air muscle and rubber band. Operate this device using the three-way air valve as before. When activated, the lever moves up.
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Pivot point Muscle attachment point
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When the air muscle fills, it shortens, pulling the lever up.
When the air is let out, the muscle lengthens and the elastic bands pull the lever down.
16.13 Second mechanical device lever sixteen
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16.14 Second mechanical device lever
IBM interface
Computer control is easy. The computer operates an electric three-way air valve. An inexpensive three-way electrically operated solenoid air valve is available (see Fig. 16.15). This air valve operates at 5 volts DC (VDC) and is rated at 90 psi. This air valve has quick connect and disconnect air ports. The 5/32"-diameter stiff tubing is simply inserted into the port hole, and it locks in. To disconnect, hold and secure the port ring with your fingers into the air valve and tug the 5/32"-diameter air tubing out. To operate a single air valve, we only need one pin off the parallel (printer) port, along with a ground (see Fig. 16.16). The output pin is buffered with a gate off of a 4050HCT noninverting hex buffer. The output of the hex buffer turns a TIP 120 NPN Darlington transistor on or off. The transistor controls the current going to the air valve.
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16.15 Electrically operated three-way air valve
BASIC program
The BASIC program is short and simple. After finding the printer port address, the following lines control the valve of pin 2:
5 REM Solenoid Air Valve Controller 10 REM John Iovine 15 REM Find Printer Port Address 20 DEF SEG = 0 25 a = (PEEK(1032) + 256 * PEEK(1033)) 30 REM Next line activates the air muscle 35 OUT a,1 40 REM Next line deactivates the air muscle 45 OUT a,0
By bringing the DB25 pin 2 high, the air valve is opened allowing air pressure to the air muscle. Bringing pin 2 low, closes the air valve to the muscle and vents the air from the air muscle.
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16.16 Schematic of air valve controller
More air
The air muscle, as previously discussed, uses compressed air from a PET plastic air storage bottle and foot pump. One can use compressed air from just about any source that s available. For instance, you can purchase small compressed air canisters used for air brushing. In fact, airbrushing supplies may provide you with a list of suitable tubing and fittings to experiment with. There are a few small electric air compressors available on the market. The more expensive ones, made for airbrush painting, have metal storage containers and air pressure regulators. At the other end of the market are the inexpensive 12-VDC portable air compressors used for tire inflation. These compressors typically do not have an air pressure regulator or air storage. These items may be purchased to make an inexpensive pneumatic system. Never use plastic PET bottles for air storage with any kind of automatic air compressor. The plastic PET bottles are only suitable for air storage with hand (or foot) operated air pumps. Always use an air storage tank with any automatic air compressor. Small air storage tanks are not expensive.
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Safety first
Since this is a new product, not too many people may be familiar with working with pneumatic systems. Therefore, a few safety guidelines should be followed. 1. Always wear goggles when prototyping a new design. 2. Never connect a plastic PET soda bottle to an air compressor. 3. Never use a glass bottle for air storage. 4. Limit PET bottle size to 1 L (or quart) or less. 5. Do not unscrew the bottle top or pull off an air fitting or valve when the system is still pressurized. Bleed the system of air first.
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