Miscellaneous

Code:

/* FSR testing sketch.

Connect one end of FSR to power, the other end to Analog 0.

Then connect one end of a 10K resistor from Analog 0 to ground

For more information see www.ladyada.net/learn/sensors/fsr.html */

int fsrPin = 0; // the FSR and 10K pulldown are connected to a0

int fsrReading; // the analog reading from the FSR resistor divider

int fsrVoltage; // the analog reading converted to voltage

unsigned long fsrResistance; // The voltage converted to resistance, can be very big so make "long"

unsigned long fsrConductance;

long fsrForce; // Finally, the resistance converted to force

void setup(void) {

Serial.begin(9600); // We'll send debugging information via the Serial monitor

}

void loop(void) {

fsrReading = analogRead(fsrPin);

Serial.print("Analog reading = ");

Serial.println(fsrReading);

// analog voltage reading ranges from about 0 to 1023 which maps to 0V to 5V (= 5000mV)

fsrVoltage = map(fsrReading, 0, 1023, 0, 5000);

Serial.print("Voltage reading in mV = ");

Serial.println(fsrVoltage);

if (fsrVoltage == 0) {

Serial.println("No pressure");

} else {

// The voltage = Vcc * R / (R + FSR) where R = 10K and Vcc = 5V

// so FSR = ((Vcc - V) * R) / V yay math!

fsrResistance = 5000 - fsrVoltage; // fsrVoltage is in millivolts so 5V = 5000mV

fsrResistance *= 10000; // 10K resistor

fsrResistance /= fsrVoltage;

Serial.print("FSR resistance in ohms = ");

Serial.println(fsrResistance);

fsrConductance = 1000000; // we measure in micromhos so

fsrConductance /= fsrResistance;

Serial.print("Conductance in microMhos: ");

Serial.println(fsrConductance);

// Use the two FSR guide graphs to approximate the force

if (fsrConductance <= 1000) {

fsrForce = fsrConductance / 80;

Serial.print("Force in Newtons: ");

Serial.println(fsrForce);

} else {

fsrForce = fsrConductance - 1000;

fsrForce /= 30;

Serial.print("Force in Newtons: ");

Serial.println(fsrForce);

}

}

Serial.println("--------------------");

delay(5000);

}

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