Arduino- und Wheatstone-Brücke ⇐ Python

[Guest]

Ich habe eine Wheatstone-Brücke in einem Bearboard gebaut und dabei einen Arduino als Power-Schriftart verwendet. Da wir vier parallel geschaltete Widerstände haben, möchte ich den Widerstandswert des vierten Widerstands berechnen. Ich habe einen Code für mein Arduino zur Berechnung dieses Widerstands erstellt und möchte wissen, ob mein Code korrekt ist

Code: Select all

int ledPin = 8;      // Define pin 8 as the output pin for 5V
int measurePin = A0; // Define the analog pin A0 for measuring Vout
float Vout = 0.0;    // Variable to store the measured bridge output voltage
float Vin = 5.0;     // Input voltage (assumed to be 5V from pin 8)
float R1 = 1000.0;   // Resistance of R1 in ohms
float R2 = 1000.0;   // Resistance of R2 in ohms
float R3 = 1000.0;   // Resistance of R3 in ohms
float R4 = 0.0;      // Calculated resistance of R4

void setup() {
pinMode(ledPin, OUTPUT); // Set pin 8 as output
pinMode(measurePin, INPUT); // Set pin A0 as input
// Initialize serial communication for debugging
}

void loop() {
// Apply 5V to the Wheatstone bridge
digitalWrite(ledPin, HIGH);

// Measure Vout at the midpoint of the bridge
int rawValue = analogRead(measurePin); // Read raw ADC value (0-1023)
Vout = (rawValue / 1023.0) * Vin; // Convert raw ADC value to voltage

// Calculate R4 using the Wheatstone bridge formula
if (Vout > 0.0 && Vout < Vin) { // Ensure Vout is within a valid range
R4 = (R2 * R3) / (R1 * ((Vin / Vout) - 1));
} else {
R4 = -1; // Indicate an error if Vout is invalid
}

// Print results to Serial Monitor
Serial.print("Measured Voltage (Vout): ");
Serial.print(Vout);
Serial.println(" V");

if (R4 > 0) {
Serial.print("Calculated Resistance (R4): ");
Serial.print(R4);
Serial.println(" ohms");
} else {
Serial.println("Error: Invalid voltage, cannot calculate R4.");
}

delay(1000); // Delay 1 second before the next measurement
}