Hello folks!
I’ve used the esp-01 and Arduino Nano to control an Electric door and a Water heater from internet, using the Thinger platform. The Android application is used to turn ON/OFF the Water heater and to hold open the Electric door for 2 seconds.
This can be done with esp-01 itself and 2 transistors, without Arduino, but I’m planing to upgrade the project and add 2 more devices on it using RF 433mhz modules to communicate to the other room.
https://www.youtube.com/watch?v=B7YCGIZ6iuY
Components used
- Arduino Nano
- esp8266 wifi module
- 2 channel relay
- 1 channel relay
- 400 point breadboard
- breadboard power supply
esp8266 code
First I’ve created a device called “wifi” on Thinger and then uploaded the code to the esp-01:
bojler = water heater
vrata = electric door
#include <SPI.h> #include <ESP8266WiFi.h> #include <ThingerWifi.h>
#define USERNAME "username" #define DEVICE_ID "deviceid" #define DEVICE_CREDENTIAL "devicecredentials"
#define SSID "networkName" #define SSID_PASSWORD "networkPassword"
ThingerWifi thing(USERNAME, DEVICE_ID, DEVICE_CREDENTIAL);
void setup() { pinMode(0, OUTPUT); pinMode(1, OUTPUT);
thing.add_wifi(SSID, SSID_PASSWORD);
// resource input example (i.e. turning on/off a light, a relay, configuring a parameter, etc) thing["bojler"] << [](pson& in){ digitalWrite(0, in ? HIGH : LOW); };
// resource input example (i.e. turning on/off a light, a relay, configuring a parameter, etc) thing["vrata"] << [](pson& in){ digitalWrite(2, in ? HIGH : LOW); }; }
void loop() { thing.handle(); }
Arduino code
then uploaded the code to the Arduino:
> int bojler = 2;
> int vrata = 3;
> int sostojba = 0;
> void setup() {
> // initialize serial communication at 9600 bits per second:
> Serial.begin(9600);
> pinMode(bojler, OUTPUT);
> pinMode(vrata, OUTPUT);
> }
> // the loop routine runs over and over again forever:
> void loop() {
> digitalWrite(vrata, LOW);
> int pom1 = analogRead(A0);
> int pom2 = analogRead(A1);
> float bojlerV = pom1 * (5.0 / 1023.0);
> float vrataV = pom2 * (5.0 / 1023.0);
>
> if (bojlerV<2)
> {
> digitalWrite(bojler, HIGH);
> }
> else if (bojlerV>3)
> {
> digitalWrite(bojler, LOW);
> }
>
> if (vrataV<2)
> {
> sostojba = 0;
> }
> else if (vrataV>3)
> {
> sostojba++;
> }
> if (sostojba==10)
> {
> sostojba = 2;
> }
> if (sostojba==1)
> {
> digitalWrite(vrata, HIGH);
> delay(2000);
> digitalWrite(vrata, LOW);
> }
>
> delay(250);
> Serial.print("Bojler napon: ");
> Serial.println(bojlerV);
> Serial.print("Vrata napon: ");
> Serial.println(vrataV);
> Serial.print("Sostojba: ");
> Serial.println(sostojba);
> }
And the wiring looks like this:
Problem
Everything works fine, but there is a little problem.
When I open the Android app the values of the two GPIO reset to LOW, if my heater is turned ON and someone opens the Android app, the heater will turn OFF. I think it is because this part of the code:
// resource input example (i.e. turning on/off a light, a relay, configuring a parameter, etc)
thing["bojler"] << [](pson& in){ digitalWrite(0, in ? HIGH : LOW); };
// resource input example (i.e. turning on/off a light, a relay, configuring a parameter, etc)
thing["vrata"] << [](pson& in){ digitalWrite(2, in ? HIGH : LOW); };
Now I need some suggestions, how to make to keep the old value i.e. when I open the app the current state to be shown, not to reset to LOW.
). So with this code you should see how the GPIO state does not change when you update the device API or use another device.