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ESP8266 WiFi relay switch (Arduino IDE)
10 years 2 months ago - 10 years 1 month ago #2049
by sueche
Replied by sueche on topic ESP8266 WiFi relay switch (Arduino IDE)
Thanks for the idea, it's worth considering.
Last edit: 10 years 1 month ago by sueche.
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10 years 2 months ago #2051
by asm7100
//
Allan
Replied by asm7100 on topic ESP8266 WiFi relay switch (Arduino IDE)
//
Allan
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10 years 2 months ago #2057
by sueche
Replied by sueche on topic ESP8266 WiFi relay switch (Arduino IDE)
Can you share a simple schematic for connecting it to the ESP8266 ?
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10 years 2 months ago #2058
by asm7100
//
Allan
Replied by asm7100 on topic ESP8266 WiFi relay switch (Arduino IDE)
Google mcp23017 
//
Allan
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9 years 9 months ago - 9 years 9 months ago #2774
by f8vpe
You really don't need the transistor, there is an optocoupler on the relais board, your ESP can handle the current.
On the boards with two or four relais you may supply 5volt to the secondairy circuit and drive the opto's with 3V3. The on/off is reversed.
I adapted the code of Igor with a possibility to reverse or not.
For the resistor on the 5 volt line I used a SMD LF33 (DPAK version) with 100nF on the 5 volt and 3V3 and 10µF on the 3v3. My code is working fine for 1 to 4 relais.
I also made some changes in the webpage to add some colors and to fit on a phone screen.
Replied by f8vpe on topic ESP8266 WiFi relay switch (Arduino IDE)
sueche wrote: Hello,
The other thing that bothers me is that on initial power up there is a fast ON/OFF/ON cycle with the relay. Any idea how to avoid ths ?
You really don't need the transistor, there is an optocoupler on the relais board, your ESP can handle the current.
On the boards with two or four relais you may supply 5volt to the secondairy circuit and drive the opto's with 3V3. The on/off is reversed.
I adapted the code of Igor with a possibility to reverse or not.
For the resistor on the 5 volt line I used a SMD LF33 (DPAK version) with 100nF on the 5 volt and 3V3 and 10µF on the 3v3. My code is working fine for 1 to 4 relais.
I also made some changes in the webpage to add some colors and to fit on a phone screen.
#include <ESP8266WiFi.h>
const char* ssid = "SSID";
const char* password = "whatever your password is";
IPAddress ip(192, 168, 178, 251); // this 3 lines for a fix IP-address
IPAddress gateway(192, 168, 178, 1);
IPAddress subnet(255, 255, 255, 0);
// #define DEBUG
#define INVERSE // low = On -- high = Off for relay prints
#define Port1 2
#define Port2 4
#define Port3 5
#define Port4 13
// ********************** end user settings ***************************
WiFiServer server(80);
void setup() {
Serial.begin(115200);
delay(10);
#ifdef INVERSE
#define On 0
#define Off 1
#else
#define On 1
#define Off 0
#endif
pinMode(Port1, OUTPUT);
digitalWrite(Port1, Off);
pinMode(Port2, OUTPUT);
digitalWrite(Port2, Off);
pinMode(Port3, OUTPUT);
digitalWrite(Port3, Off);
pinMode(Port4, OUTPUT);
digitalWrite(Port4, Off);
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
WiFi.config(ip, gateway, subnet);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
// Start the server
server.begin();
Serial.println("Server started");
// Print the IP address
Serial.print("Use this URL to connect: ");
Serial.print("http://");
Serial.println(WiFi.localIP());
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
// Wait until the client sends some data
#ifdef DEBUG
Serial.println("new command");
#endif
while (!client.available()) {
delay(1);
}
// Read the first line of the request
String request = client.readStringUntil('\r');
#ifdef DEBUG
Serial.println(request);
#endif
client.flush();
// Match the request
if (request.indexOf("/light1on") > 0) {
digitalWrite(Port1, On);
}
if (request.indexOf("/light1off") > 0) {
digitalWrite(Port1, Off);
}
if (request.indexOf("/light2on") > 0) {
digitalWrite(Port2, On);
}
if (request.indexOf("/light2off") > 0) {
digitalWrite(Port2, Off);
}
if (request.indexOf("/light3on") > 0) {
digitalWrite(Port3, On);
}
if (request.indexOf("/light3off") > 0) {
digitalWrite(Port3, Off);
}
if (request.indexOf("/light4on") > 0) {
digitalWrite(Port4, On);
}
if (request.indexOf("/light4off") > 0) {
digitalWrite(Port4, Off);
}
// Set ledPin according to the request
//digitalWrite(ledPin, value);
// Return the response
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println(""); // do not forget this one
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.println("<head>");
client.println("<meta name='apple-mobile-web-app-capable' content='yes' />");
client.println("<meta name='apple-mobile-web-app-status-bar-style' content='black-translucent' />");
client.println("</head>");
client.println("<body bgcolor = darkgrey>");
client.println("<hr/><hr>");
client.println("<h4><center> WiFi Electrical Device Control </center></h4>");
client.println("<hr/><hr>");
client.println("<br><br>");
client.println("<center>");
client.println("Device 1 ");
client.println("<a href=\"/light1on\"\"><button>Turn On </button></a>");
client.println("<a href=\"/light1off\"\"><button>Turn Off </button></a><br />");
client.println("<br>");
client.println("Device 2 ");
client.println("<a href=\"/light2on\"\"><button>Turn On </button></a>");
client.println("<a href=\"/light2off\"\"><button>Turn Off </button></a><br />");
client.println("<br>");
client.println("Device 3 ");
client.println("<a href=\"/light3on\"\"><button>Turn On </button></a>");
client.println("<a href=\"/light3off\"\"><button>Turn Off </button></a><br />");
client.println("<br>");
client.println("Device 4 ");
client.println("<a href=\"/light4on\"\"><button>Turn On </button></a>");
client.println("<a href=\"/light4off\"\"><button>Turn Off </button></a><br />");
client.println("<br>");
client.println("<table border=\"5\">");
client.println("<tr>");
#ifdef INVERSE
if (not(digitalRead(Port1)))
#else
if (digitalRead(Port1))
#endif
{
client.print("<td bgcolor=red> Device 1 is ON</td>");
}
else {
client.print("<td bgcolor=green> Device 1 is OFF</td>");
}
#ifdef INVERSE
if (not(digitalRead(Port2)))
#else
if (digitalRead(Port2))
#endif
{
client.print("<td bgcolor=red> Device 2 is ON</td>");
}
else {
client.print("<td bgcolor=green> Device 2 is OFF</td>");
}
client.println("</tr>");
client.println("<tr>");
#ifdef INVERSE
if (not(digitalRead(Port3)))
#else
if (digitalRead(Port3))
#endif
{
client.print("<td bgcolor=red> Device 3 is ON</td>");
}
else {
client.print("<td bgcolor=green> Device 3 is OFF</td>");
}
#ifdef INVERSE
if (not(digitalRead(Port4)))
#else
if (digitalRead(Port4))
#endif
{
client.print("<td bgcolor=red> Device 4 is ON</td>");
}
else {
client.print("<td bgcolor=green> Device 4 is OFF</td>");
}
client.println("</tr>");
client.println("</table>");
client.println("</center>");
client.println("</html>");
delay(1);
#ifdef DEBUG
Serial.println("Client disonnected");
Serial.println("");
#endif
}
Last edit: 9 years 9 months ago by f8vpe. Reason: Apparent je cannot attach code as a file .ino
The following user(s) said Thank You: donvukovic
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9 years 9 months ago - 9 years 9 months ago #2779
by sueche
Replied by sueche on topic ESP8266 WiFi relay switch (Arduino IDE)
Hello,
thanks for your effort and reply but unfortunately I had to use the trasistor, because without it I can't drive the relay. I've tested this with ESP-201 and ESP-02 and it's the same in both cases - the transistor is needed.
As for the logic I have reversed it in the code.
I don't know if it depends on the relay boards I am using therefor I will post the type of these:
normal relay - 10A - www.aliexpress.com/item/New-1-Channel-H-...-5V/32313464005.html
power relay - 30A - www.aliexpress.com/item/2-5V-30A-1-Chann...ing/32342340182.html
thanks for your effort and reply but unfortunately I had to use the trasistor, because without it I can't drive the relay. I've tested this with ESP-201 and ESP-02 and it's the same in both cases - the transistor is needed.
As for the logic I have reversed it in the code.
I don't know if it depends on the relay boards I am using therefor I will post the type of these:
normal relay - 10A - www.aliexpress.com/item/New-1-Channel-H-...-5V/32313464005.html
power relay - 30A - www.aliexpress.com/item/2-5V-30A-1-Chann...ing/32342340182.html
Last edit: 9 years 9 months ago by sueche.
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