Convert potentiometer angle to digital code. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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By placing a few bytes of program into an 8008/8080 microprocessor and using a 555 type integral timer, a system can be created that converts the potentiometer angle into a digital code. This method is convenient and advantageous to apply in cases where information about the position of the potentiometer is input to a system containing a microprocessor (process control systems, television games, etc.).
As shown in the figure, the microprocessor strobe pulse starts the 555 integrated timer, which is switched on in a standby multivibrator circuit. The time interval corresponding to a high potential at the output of the timer is proportional to the resistance of the potentiometer. To measure this period, the microprocessor increases the contents of the internal register as long as the potential of the integral timer at the input of D7 remains high.
When the microprocessor needs to enter information about the position of the potentiometer, the program calls the POTPOS (potentiometer position) subroutine, which uses four flags, an accumulator and register B. As shown in the figure, the following microprocessor operations correspond to this subroutine:
1. Set register B to 0.
2. Enable timer 555.
3. Increase the contents of register B by 1.
4. Apply the state of IC 555 to the battery discharge input D7.
5. Set the negative value of the sign flag when the state is negative.
6. Return to step three with a negative flag.
7. Return to the main program if the flag is not negative.
Before returning to the main program, register B contains a number proportional to the IC 555's output pulse width and therefore corresponding to the angle of the potentiometer.
When using the program and hardware described above, in relation to a microprocessor with a clock frequency of 2,5 μs, the output code of register B changes from 2 to 65 (in hexadecimal code), i.e., provides 100 discrete values over the entire adjustment range of the potentiometer. The resistance of the potentiometer and the capacitance of the timing capacitor may vary depending on the speed of the microprocessor used and the specified dynamic range.
Author: N. Shulein; Publication: N. Bolshakov, rf.atnn.ru
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