About This Project
This project is a secondary monitor to ensure my tortoise has appropriate temperatures during the winter. It will alert me when temperatures drop below a set limit. I plan on replacing the ESP board with a true PCB milled with a CNC at some point and adding more photos. My tortoise was taking a nap when I was finishing up so I didn’t disturb her.
What’s Connected
Customized ESP-12e with 3d printed case.
Triggers & Alerts
There is a trigger set up that will alert me when temperatures drop below a set limit.
Dashboard Screenshots
Photos of the Project
Here is the Arduino sketch, but I recommend reading this post for an explanation of how everything works in more detail.
// This example shows how to connect to Cayenne using an ESP8266 and send/receive sample data.
// Make sure you install the ESP8266 Board Package via the Arduino IDE Board Manager and select the correct ESP8266 board before compiling.
//#define CAYENNE_DEBUG
#define CAYENNE_PRINT Serial
#define DHTTYPE DHT11
#define DHTPIN 14
#include <CayenneMQTTESP8266.h>
#include <DHT.h>
// WiFi network info.
char ssid[] = "";
char wifiPassword[] = "";
// Cayenne authentication info. This should be obtained from the Cayenne Dashboard.
char username[] = "";
char password[] = "";
char clientID[] = "";
//Variables for DHT11 values
float h, t, hif;
//Time to sleep - 10 minutes - delete a zero to set to 1 minute
int SleepTime = 600000000;
//Values sent/error booleans
bool CayenneSent = false;
bool ReadError = false;
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600);
Serial.println("Setup");
Cayenne.begin(username, password, clientID, ssid, wifiPassword);
CayenneSent = false;
ReadError = true;
}
void loop() {
//Run Cayenne Functions
Cayenne.loop();
//Only check values if there is a ReadError
if (ReadError){
ReadError = false;
//Check if read failed and try until success
int WhileLoops = 0;
do {
WhileLoops++;
//We can't go too long without calling Cayenne.loop() so exit this loop after 2 seconds and set an error flag
if (WhileLoops >= 4){
Serial.println("Sensor Read Error");
ReadError = true;
break;
}
//Read temperature as Fahrenheit
t = dht.readTemperature(true);
//Read humidity (percent)
h = dht.readHumidity();
//Read temperature as Fahrenheit
t = dht.readTemperature(true);
//Calculate Heat Index as Fahrenheit
hif = dht.computeHeatIndex(t, h);
delay(500);
} while (isnan(t) || isnan(h));
Serial.print("Humidity: ");
Serial.println(h);
Serial.print("Temperature (f): ");
Serial.println(t);
Serial.print("Heat Index (f): ");
Serial.println(hif);
}
else {
//Check if we sent all values and sleep for 10 minutes if we did
if (CayenneSent){
Serial.println("Sent all values - sleeping");
delay(100);
ESP.deepSleep(SleepTime, WAKE_RF_DEFAULT);
delay(100);
}
}
}
// Default function for sending sensor data at intervals to Cayenne.
// You can also use functions for specific channels, e.g CAYENNE_OUT(1) for sending channel 1 data.
CAYENNE_OUT_DEFAULT()
{
//Check if there was a read error and skip sending values if there is
if (!ReadError){
//Send Values
Cayenne.virtualWrite(0, h, "rel_hum", "p");
Cayenne.virtualWrite(1, t, "temp", "f");
Cayenne.virtualWrite(2, hif, "temp", "f");
//Set CayenneSent to true so we know when to sleep
CayenneSent = true;
}
}
They are a destructive beast!
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