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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.

Team LRN
Chapter sixteen