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Studying voltage with Arduino is straightforward. You’ll want solely a potentiometer to regulate the resistance. Regardless of being simple, this undertaking is nice for teenagers as a result of it explains the fundamentals of the 5V logic of electronics. The elements you want are a breadboard, an Arduino Uno R3, a potentiometer and two jumpers.
With digital enter, 5V is perceived as HIGH and 0V as LOW. However, electrical energy doesn’t solely have two values 5V and 0V, however they can be extra. The microcontrollers cannot perceive the values comparable to 12.23456 V. For that purpose, we’d like the analogue values to be transformed to digital values. This system is finished by {hardware} named analogue to digital converter. Arduino UNO already has an analog-to-digital converter (ADC).
The analogue to digital converter (ADC) divides the voltage into a number of equal elements. For Arduino Uno, 0-5V values are divided into 1023 equal elements. So, for a 3V enter, for instance, 614 would be the closest digital worth. So the equation to calculate an unknown voltage will probably be:
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Digital studying * (5.0 / 1023.0) |
The potentiometer has three legs. The center leg is required to be linked to the A0 pin of Arduino. The left pin and proper pin are required to be linked to pay load (Arduino’s 5V for calibration or testing) and GND (required to be made widespread with Arduino’s GND). That is the sketch:
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const int VOL_PIN = A0;
void setup(){ Serial.start( 9600 ); }
void loop(){ int worth; float volt;
worth = analogRead( VOL_PIN );
volt = worth * 5.0 / 1023.0;
Serial.print( “Worth: “ ); Serial.print( worth ); Serial.print( ” Volt: “ ); Serial.println( volt );
delay( 500 ); } |
Now, once you open your Serial Monitor within the Arduino IDE. You must see a gradual stream of numbers starting from 0.0 – 5.0. As you flip the potentiometer, the values will change.
