// This example shows how to connect Voltage sensor to Cayenne using a manually specified Ethernet connection and send/receive sample data. //#define CAYENNE_DEBUG #define CAYENNE_PRINT Serial #include //#include // Uncomment this and comment out CayenneEthernet.h to use an Ethernet 2 shield or other Ethernet W5500 shield. // You will need the Ethernet2 library installed. See the ArduinoEthernetW5500 example sketch for more info. //#include // Uncomment this and comment out CayenneEthernet.h to use an Ethernet W5200 shield. // You will need the EthernetW5200 library installed. See the ArduinoEthernetW5200 example sketch for more info. // Cayenne authentication info. This should be obtained from the Cayenne Dashboard. char username[] = "MQTT_USERNAME"; char password[] = "MQTT_PASSWORD"; char clientID[] = "CLIENT_ID"; // Mac address should be different for each device in your LAN byte arduino_mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED }; IPAddress arduino_ip(10, 0, 0, 20); IPAddress dns_ip(8, 8, 8, 8); IPAddress gateway_ip(10, 0, 0, 1); IPAddress subnet_mask(255, 255, 255, 0); unsigned long lastMillis = 0; void setup() { Serial.begin(9600); Cayenne.begin(username, password, clientID, arduino_ip, dns_ip, gateway_ip, subnet_mask, arduino_mac); } void loop() { Cayenne.loop(); //Publish data every 1 seconds (1000 milliseconds). Change this value to publish at a different interval. if (millis() - lastMillis > 1000) { lastMillis = millis(); //Write data to Cayenne here. This example just sends the current uptime in milliseconds. Cayenne.virtualWrite(0, lastMillis); int analogValue = analogRead(A0); // read the input on analog pin 0 float a = 5; //I am measuring 25V on sensor, 25V/5V=5 float b = 0.00455522971; //Voltage on 5V pin on arduino / 1024, My voltage is 4.66V > 4.66/1024=0.00455522971 float voltage; voltage = analogValue * a * b; Cayenne.virtualWrite(1, voltage, "voltage", "v"); } } //Default function for processing actuator commands from the Cayenne Dashboard. //You can also use functions for specific channels, e.g CAYENNE_IN(1) for channel 1 commands. CAYENNE_IN_DEFAULT() { CAYENNE_LOG("CAYENNE_IN_DEFAULT(%u) - %s, %s", request.channel, getValue.getId(), getValue.asString()); //Process message here. If there is an error set an error message using getValue.setError(), e.g getValue.setError("Error message"); }