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// vim: filetype=cpp
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = { 0x02, 0xEE, 0x00, 0xEF, 0xFE, 0xED };
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
EthernetClient client;
void sendKeyValue(const char *key, const char *value) {
char hdrbuf[512];
snprintf(hdrbuf, 512, "Content-Length: %d\r\n", strlen(value));
if ( ! client.connect("10.1.0.1", 8080)) {
Serial.println("Failed to connect");
delay(500);
return;
}
Serial.print("Send ");
Serial.print(key);
Serial.print("=");
Serial.println(value);
client.write("PUT /api/value/");
client.write(key);
client.write(" HTTP/1.1\r\n");
client.write(hdrbuf);
client.write("\r\n");
client.write(value);
client.stop();
}
void sendPinValue() {
long sensorValue,
sensorValueMV,
sensorValueDBA,
pinnr;
char buf[12];
char *sensorKey = "arduino.aX",
*sensorKeyMV = "arduino.aX.mv",
*sensorKeyDBA = "arduino.aX.dba";
for (int i = A0; i <= A5; i++) {
pinnr = i - A0;
sensorValue = analogRead(i);
sensorKey[9] = '0' + pinnr;
snprintf(buf, 8, "%u", sensorValue);
sendKeyValue(sensorKey, buf);
sensorValueMV = sensorValue * (ADC_REF_MV*100/ADC_MAX_STEP);
sensorKeyMV[9] = '0' + pinnr;
snprintf(buf, 8, "%ld.%03ld", sensorValueMV/100, sensorValue%100);
sendKeyValue(sensorKeyMV, buf);
sensorValueDBA = sensorValueMV / OV_FACTOR;
sensorKeyDBA[9] = '0' + pinnr;
snprintf(buf, 12, "%ld.%04ld", sensorValueDBA/1000, sensorValueDBA%1000);
sendKeyValue(sensorKeyDBA, buf);
}
}
void setup() {
Serial.begin(9600);
Serial.println("Begin init");
// declare the ledPin as an OUTPUT:
pinMode(ledPin, OUTPUT);
// start the Ethernet and UDP: Use DHCP for IP-Configuration
Ethernet.begin(mac);
Serial.println("Ethernet init done");
analogReference(EXTERNAL);
delay(1000);
Serial.println("Start loop()");
}
char buf[512];
void loop() {
unsigned long dt = millis();
digitalWrite(ledPin, HIGH);
sendPinValue();
digitalWrite(ledPin, LOW);
dt = (millis() - dt);
if (dt < 1000) delay(1000 - dt);
}
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