controll 4 relays from ESP8266-01
Posted: Mon Nov 21, 2022 8:38 pmHi all,
I recently bought a ESP8266 WIFI 4 Channel Relay Module (this one).
I am using the ARDUINO IDE and a USB to TTL board to write and upload programs to the ESP.
So far, so good, but...
I can't find how to turn on or off the relays...
The technical information says this:
but I have no idea what this means or how to do this.
The code below will create a WiFiServer where you can access an html-page.
It contains a button to turn ON the BUILDIN_LED. A second button will turn it OFF again.
This all works fine...
Now I need to change line 23 and 27 to controll the relay.
Does anybody know how?
Thanks
Janosik.
I recently bought a ESP8266 WIFI 4 Channel Relay Module (this one).
I am using the ARDUINO IDE and a USB to TTL board to write and upload programs to the ESP.
So far, so good, but...
I can't find how to turn on or off the relays...
The technical information says this:
Relay control command(Hexadecimal):
Turn OFF the first relay : A0 01 00 A1
Turn ON the first relay : A0 01 01 A2
Turn OFF the second relay : A0 02 00 A2
Turn ON the second relay : A0 02 01 A3
Turn OFF the third relay : A0 03 00 A3
Turn ON the third relay : A0 03 01 A4
Turn OFF the fourth relay : A0 04 00 A4
Turn ON the fourth relay : A0 04 01 A5
but I have no idea what this means or how to do this.
The code below will create a WiFiServer where you can access an html-page.
It contains a button to turn ON the BUILDIN_LED. A second button will turn it OFF again.
This all works fine...
Now I need to change line 23 and 27 to controll the relay.
Does anybody know how?
Thanks
Janosik.
Code: Select all
#include <ESP8266WiFi.h>
const char* ssid="******";
const char* password="******";
const int PIN=1;
WiFiServer server(8080);
void setup(){
pinMode(PIN,OUTPUT);
digitalWrite(PIN,HIGH);
WiFi.begin(ssid,password);
while(WiFi.status()!=WL_CONNECTED){delay(500);}
server.begin();
}
void loop(){
String request,receivedCommand;
WiFiClient client=server.available();
if(!client){return;}
while(!client.available()){delay(1);}
request=client.readStringUntil('\r');
client.flush();
if(request.indexOf("?RELAY1ON")!=-1){
receivedCommand="1 on"; //turn ON relay1
digitalWrite(PIN,LOW);
}
if(request.indexOf("?RELAY1OFF")!=-1){
receivedCommand="1 off"; //turn OFF relay1
digitalWrite(PIN,HIGH);
}
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("");
client.println("<html>");
client.println("<body>");
client.print("PIN = ");
client.println(PIN);
client.print("<br>Received command = ");
client.println(receivedCommand);
client.println("<br><a href='/?RELAY1ON'><button class='button'>RELAY1 ON</button></a>");
client.println("<br><a href='/?RELAY1OFF'><button class='button'>RELAY1 OFF</button></a>");
client.println("</body>");
client.println("</html>");
delay(1);
}