I need a simple, compact way to send Arduino a voltage signal proportional to a potentiometer (pot) position. The issue is that the1K pot installed is a 10-turn and the angle traveled is only about 70 deg so ~2% of the 1K range (about 20 ohm change). Arduino 5V is sent to the pot input (about 3 feet away) and also to this small circuit near the Pot. The pot is set at one end of travel and the near 0 ohm end (1%=10ohm). The OP AMP takes the difference between the Arduino 5V and the pot output voltage and also then amplifies this difference by about 30X. This results in a voltage output back to the Arduino (represented by the Voltmeter) of 0 to 4.4 volts proportional to the pot position of 1% to 3%. Try it by changing the pot % position settings. The 1K resistor to the voltmeter is a current-limit safety. NOT SHOWN: Vcc+ is also connected to +5V and Vcc- is connected to ground. Oh, and I plan to use trim pots for the 716 & 399 ohm resistors as getting 0 volts when the pot is near 0 ohms is balancing act of these two guys.
REV 1: Realized that the output was inverted. Added inverting OP AMP with gain of 1 to correct this. Using a TI NE5532 chip which has 2 OP AMPs built in, so this works fine. Eliminated the capacitor also - don't think it's needed.
