HW-655 ESP-01 WiFi Relay Board Fix
by Patronic in Circuits > Arduino
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HW-655 ESP-01 WiFi Relay Board Fix
Some years ago, I purchased a couple of ESP8266 HW-655 Relay Boards.
After a lot of trial and effort I could not get them to work with suggested Arduino sketches.
I came to the conclusion that the STC micro was not programmed.
Well recently, I decided to modify the boards to work directly from the ESP-01; and make a program to operate it
Supplies
Tools needed : pliers, soldering Iron, solder wick and solder.
Component Replacement
First step was to remove any parts that impeded the GPIO ports.
The NPN driver which I replaced with 5cent 2N7002, remove the drive resistors and STC chip;
Wiring
I then linked the GPIO 0 port via the moved10k resistor to the gate of the FET.
Then I had to rebuild the RELAY.INO to act as a Server.
See the pictures and copy the modified sketch with hints from Rui Santos:
Good Luck!!
INO file to copy
Code.ino
/*********
ESP-01 RELAY; some snippets from Rui Santos
********/
#include <ESP8266WiFi.h>
const char* ssid = "xxxxxxxxxxx"; // fill in here your router or wifi SSID
const char* password = "xxxxxxxxxx"; // fill in here your router or wifi password
#define RELAY 2 // relay connected to GPIO2 = 2 OR GPIO0 = 0
WiFiServer server(80);
void setup()
{
Serial.begin(115200); // must be same baudrate with the Serial Monitor
pinMode(RELAY,OUTPUT);
digitalWrite(RELAY, LOW);
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) //while unconnected loop .....
{delay(500);
Serial.print("."); }
// Start the server
Serial.println(""); //if connected START up
Serial.println("WiFi connected");
server.begin();
// Print the IP address
Serial.print("Use this URL to connect: ");
Serial.print(WiFi.localIP());
Serial.println("/");
}
//*******************************
void loop() {
// Check if a client has connected
WiFi.setAutoReconnect(true);
WiFi.persistent(true);
WiFiClient client = server.available();
{delay(300); } //reqired to wait for previous request to clear
if (!client)
{return;}
// Wait until the client sends some data
while(!client.available())
{delay(1); }
// Read the first line of the request
String request = client.readStringUntil('\r');
Serial.println(request);
client.flush();
// Match the request
int STATE = LOW;
if (request.indexOf("/RELAY=ON") != -1)
{Serial.println("RELAY=ON");
digitalWrite(RELAY,HIGH);
STATE = HIGH;}
if (request.indexOf("/RELAY=OFF") != -1)
{Serial.println("RELAY=OFF");
digitalWrite(RELAY,LOW);
STATE = LOW;}
// Display the HTML web page
client.println("<!DOCTYPE html><html><body style=background-color:#00cccc;>"); //1c87c9
client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
// CSS to style the on/off buttons
client.println("<style>html {font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button {background-color: #195B6A; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #ff0000;}</style></head>"); // red $ff $xx $xx R G B
// Web Page Heading
client.println("<br />"); // Print a line space
client.println("<h1> RELAY CONTROL </h1>");
// Current Relay Status set boxes
client.println("<h1><br>"); //<body> <h1> is headline <br> Print 1 line space
client.println("Turn RELAY<a href=\"/RELAY=ON\"> ON</a> <br><br>");
client.println("Turn RELAY<a href=\"/RELAY=OFF\">OFF</a><br><br>");
if (STATE == LOW)
{client.println("<p><button class=\"button\">RELAY OFF</button></a></p>");}
else
{ client.println("<p><button class=\"button button2\">RELAY ON</button></a></p>");}
// Command executed
// client.stop(); // Dot know if this works
// Clear the request variable
request = "";
}