A. Assemble from existing Proteus components on the schematic
This is the most common error. If you apply 12V to the sensor input and the Arduino reads 12V on the ADC, you might be overloading the ADC (since 12V > 5V). voltage sensor proteus library
Navigate to your Proteus installation folder (usually C:\Program Files (x86)\Labcenter Electronics\Proteus 8 Professional\Data\LIBRARY ). both the .LIB and .IDX files into this folder. Restart Proteus to initialize the new components. Alternative: Building a Sensor Without a Library voltage sensor proteus library
void loop() int adcValue = analogRead(A0); // Sensor: 0-25V maps to 0-5V output. // 5V output corresponds to ADC 1023. float voltage = (adcValue / 1023.0) * 25.0; voltage sensor proteus library