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https://github.com/daniviga/bite.git
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108 lines
2.7 KiB
C++
108 lines
2.7 KiB
C++
#include <EEPROM.h>
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#include <Ethernet.h>
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#include <ArduinoJson.h>
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#define DEBUG_TO_SERIAL 1
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#define AREF_VOLTAGE 3.3
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const String serverName = "sensor.server.domain";
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const size_t capacity = JSON_OBJECT_SIZE(1) + 2*JSON_OBJECT_SIZE(6);
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DynamicJsonDocument doc(capacity);
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JsonObject payload = doc.createNestedObject("payload");
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JsonObject temp = payload.createNestedObject("temperature");
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int tempPin = A0;
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int photocellPin = A1;
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struct netConfig {
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IPAddress address;
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int port;
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};
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netConfig config;
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const String URL = "/telemetry/";
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const int postDelay = 10 * 1000;
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void setup(void) {
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Serial.begin(9600);
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analogReference(EXTERNAL);
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byte mac[6];
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char serial[9];
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int eeAddress = 0;
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EEPROM.get(eeAddress, mac);
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eeAddress += sizeof(mac);
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EEPROM.get(eeAddress, serial);
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eeAddress += sizeof(serial);
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Serial.println("Initialize Ethernet with DHCP:");
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if (Ethernet.begin(mac) == 0) {
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Serial.println("Failed to configure Ethernet using DHCP");
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if (Ethernet.hardwareStatus() == EthernetNoHardware) {
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Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");
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} else if (Ethernet.linkStatus() == LinkOFF) {
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Serial.println("Ethernet cable is not connected.");
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}
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// no point in carrying on, so do nothing forevermore:
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while (true) {
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delay(1);
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}
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}
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EEPROM.get(eeAddress, config);
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Serial.print("IoT #");
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Serial.print(serial);
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Serial.println(" started at address:");
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Serial.println(Ethernet.localIP());
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Serial.println();
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Serial.println("Connecting to:");
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Serial.print(config.address);
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Serial.print(":");
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Serial.println(config.port);
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doc["device"] = serial; // FIXME
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payload["id"] = serverName;
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}
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void loop(void) {
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int photocellReading = analogRead(photocellPin);
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int tempReading = analogRead(tempPin);
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float tempVoltage = tempReading * AREF_VOLTAGE / 1024.0;
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float tempC = (tempVoltage - 0.5) * 100 ;
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payload["light"] = photocellReading;
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temp["celsius"] = tempC;
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temp["raw"] = tempReading;
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temp["volts"] = tempVoltage;
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if (EthernetClient client = client.connect(config.address, config.port)) {
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client.print("POST ");
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client.print(URL);
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client.println(" HTTP/1.1");
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client.print("Host: ");
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printAddr(config.address, &client);
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client.print(":");
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client.println(config.port);
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client.println("Content-Type: application/json");
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client.print("Content-Length: ");
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client.println(measureJsonPretty(doc));
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client.println("Connection: close");
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client.println();
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serializeJson(doc, client);
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client.stop();
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#if DEBUG_TO_SERIAL
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serializeJsonPretty(doc, Serial);
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#endif
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}
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delay(postDelay);
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}
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