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// vim: filetype=cpp expandtab shiftwidth=4 softtabstop=4
const int ledPin = 13; // select the pin for the LED
const long ADC_REF_MV = 3300;
const long ADC_MAX_STEP = 1024;
const long OV_FACTOR = 4; // Op. Verstärker Faktor = 4; 10mV = 1dB
void sendKeyValue(const char *key, const char *value) {
Serial.print(key);
Serial.print("=");
Serial.println(value);
}
void sendPinValue(int pin) {
long sensorValue,
sensorValueMV,
sensorValueDBA;
char buf[12];
char *sensorKey = "arduino.aX",
*sensorKeyMV = "arduino.aX.mv",
*sensorKeyDBA = "arduino.aX.dba";
int port = A0 + pin;
sensorValue = analogRead(port);
sensorKey[9] = '0' + pin;
snprintf(buf, 8, "%u", sensorValue);
sendKeyValue(sensorKey, buf);
sensorValueMV = sensorValue * (ADC_REF_MV*100/ADC_MAX_STEP);
sensorKeyMV[9] = '0' + pin;
snprintf(buf, 8, "%ld.%03ld", sensorValueMV/100, sensorValue%100);
sendKeyValue(sensorKeyMV, buf);
sensorValueDBA = sensorValueMV / OV_FACTOR;
sensorKeyDBA[9] = '0' + pin;
snprintf(buf, 12, "%ld.%04ld", sensorValueDBA/1000, sensorValueDBA%1000);
sendKeyValue(sensorKeyDBA, buf);
}
void setup() {
Serial.begin(115200);
// declare the ledPin as an OUTPUT:
pinMode(ledPin, OUTPUT);
// Reference is EXTERNAL (3v)
analogReference(EXTERNAL);
}
void loop() {
if (Serial.available() > 0) {
digitalWrite(ledPin, HIGH);
int pin = Serial.read();
while (Serial.available()) Serial.read();
sendPinValue(pin-'0');
Serial.flush();
digitalWrite(ledPin, LOW);
}
}
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