##General introduction, About This Project
Had an old watering controller that failed ages ago, but the water solenoids were still installed.
Got a NodeMCU 12E and a four relay board and taught bmyself how to programme it and use Cayenne
as the IoT interface. Added a DHT-11 temp/humidity sensor and there you go yet another watering system
controlled by Cayenne. Took me two days to code it and one day to build the box and install it. Nothing
fancy but Hey it works!
Who says new tricks can’t be learnt when you are 62 yrs old!!
What’s Connected
NodeMCU 12E
4 realy board
WIFI connected
Scheduling
Scheduling works fine
Dashboard Screenshots
##Project Photos
Temperature sensor housingtemp sensor 1|690x460
In the box ready to run
Code of Project
#include <CayenneMQTTESP8266.h>
#include <SimpleDHT.h>
int pinDHT11 = D5;
SimpleDHT11 dht11;
int temperature;
int humidity;
#define RELAY1_PIN D1 // RELAY1 PIN
#define RELAY2_PIN D2// RELAY2 PIN
#define RELAY3_PIN D3 // RELAY3 PIN
#define RELAY4_PIN D4 // RELAY4 PIN
// WiFi network info.
char ssid[] = "";
char wifiPassword[] = "";
// Cayenne authentication info. This should be obtained from the Cayenne Dashboard.
char username[] = "";
char password[] = "";
char clientID[] = "";
void setup()
{
Cayenne.begin(username, password, clientID, ssid, wifiPassword);
pinMode(RELAY1_PIN, OUTPUT);
pinMode(RELAY2_PIN, OUTPUT);
pinMode(RELAY3_PIN, OUTPUT);
pinMode(RELAY4_PIN, OUTPUT);
digitalWrite(RELAY1_PIN, HIGH);
digitalWrite(RELAY2_PIN, HIGH);
digitalWrite(RELAY3_PIN, HIGH);
digitalWrite(RELAY4_PIN, HIGH);
}
void loop()
{
byte temperature = 0;
byte humidity = 0;
byte data[40] = {0};
dht11.read(pinDHT11, &temperature, &humidity, data);
Cayenne.virtualWrite(1, ((int)temperature));
Cayenne.virtualWrite(3, ((int)humidity));
// DHT11 sampling rate is 2HZ.
delay(2000);
Cayenne.loop();
}
CAYENNE_IN(2)
{
// get value sent from dashboard
int currentValue = getValue.asInt(); // 0 to 1
// assuming you wire your relay as normally open
if (currentValue == 0) {
digitalWrite(RELAY1_PIN, HIGH);
} else {
digitalWrite(RELAY1_PIN, LOW);
}
}
CAYENNE_IN(4)
{
// get value sent from dashboard
int currentValue = getValue.asInt(); // 0 to 1
// assuming you wire your relay as normally open
if (currentValue == 0) {
digitalWrite(RELAY2_PIN, HIGH);
} else {
digitalWrite(RELAY2_PIN, LOW);
}
}
CAYENNE_IN(6)
{
// get value sent from dashboard
int currentValue = getValue.asInt(); // 0 to 1
// assuming you wire your relay as normally open
if (currentValue == 0) {
digitalWrite(RELAY3_PIN, HIGH);
} else {
digitalWrite(RELAY3_PIN, LOW);
}
}
CAYENNE_IN(8)
{
// get value sent from dashboard
int currentValue = getValue.asInt(); // 0 to 1
// assuming you wire your relay as normally open
if (currentValue == 0) {
digitalWrite(RELAY4_PIN, HIGH);
} else {
digitalWrite(RELAY4_PIN, LOW);
}
}
