[Experiment] Automatic watering machine for home garden triggered by whatsapp message

Automatic Watering Machine using ESP for home garden during Vacations

In this tutorial, we will build a low cost watering machine that can water home garden plants daily upon a message on whatsapp. In the past every time i go on a vacation all my plants use to die and i had to get new plants from nursery. Hopefully this device should keep my plants alive while i am away. 

Parts needed

Watering Machine
1. ESP 01
2. One Channel Relay
3. Power module
4. Jumper wires
5. Male and Female DC connectors
6. DC diaphragm Water pump


Plumbing
1. Butterfly hose connectors for input and output pipes
2. 6mm pipe
3. Transparent 6mm water pipe as inlet
4. 10mm water pipe (blue color) as outlet.
5. 10mm to 6mm elbow connector (Connects outlet and 6mm pipe)
6. Arrow stakes (to secure pipe above roots)
7. Nozzle heads (control water flow for each plant)
8. 6mm elbow and tee push fit connectors
  




Complete plumbing as shown in above video.


Hardware connections

ESP 01 3.3V to Power module 3.3V
ESP 01 GND to Power module Gnd
Power module 3.3v to One channel relay Vcc
Power module Gnd to One channel relay Gnd
ESP 01 IO0 to One channel relay IN
Power module 12 v to DC male jack +ve
DC male Jack -ve to relay output terminal NO
Relay Output terminal COM to power module GND

To send whatsapp messages (I used whatabot getstarted guide)

Once you have the api key you can replace it in the below code

CODE

I took inspiration from whatabot example and complete the prerequisites as mentioned here
#include <WhatabotAPIClient.h>
#include <WiFiManager.h>

#define RELAY 0

#define WHATABOT_API_KEY "YOUR_KEY_HERE"
#define WHATABOT_CHAT_ID "YOUR_MOBILE_NUMBER_HERE"
#define WHATABOT_PLATFORM "whatsapp"

WiFiManager wifiManager;
WhatabotAPIClient whatabotClient(WHATABOT_API_KEY, WHATABOT_CHAT_ID, WHATABOT_PLATFORM);

void setup() {
  Serial.begin(115200);
  pinMode(RELAY,OUTPUT);
  digitalWrite(RELAY, HIGH);
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, HIGH); 
  wifiManager.setConfigPortalTimeout(300);
  wifiManager.autoConnect("Sensorism Watering System");
  whatabotClient.begin();
  whatabotClient.onMessageReceived(onMessageReceived); 
  whatabotClient.onServerResponseReceived(onServerResponseReceived);
}

void loop() {
  whatabotClient.loop(); 
}

void onServerResponseReceived(String message) {
  Serial.println(message); 
}

void onMessageReceived(String message) {
  message.toUpperCase();
  Serial.println(message);

  if (message.equals("START")) {
    whatabotClient.sendMessageWS("Starting");
    digitalWrite(LED_BUILTIN, LOW);  
    digitalWrite(RELAY,LOW);
    delay(15000);
    digitalWrite(RELAY, HIGH);
    digitalWrite(LED_BUILTIN, HIGH);
    whatabotClient.sendMessageWS("Watering for today is complete");
  } else {
    whatabotClient.sendMessageWS("Unknown command");
    // Handle unknown commands here (optional)
  }
  
}



Post upload you will need to configure wifi manager for the first time as described earlier in this tutorial.





After powering up the device wait for 5 sec for ESP to connect to whatabot. Send a "start" message on whatsapp to whatabot contact. In my case i saved it as Sensorism bot.



Once watering is complete you can check your whatsapp for notification.

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