I'm trying to switch on bulb via 4 channel 5V optocoupler relay controller from ESP8266 using WIFI Access point. All my connections looking fine and i can able to connect WIFI SoftAP and send signal to ESP8266 01. Even i can able to switch the Relay from NO to NC or other way around. Only when a connect 240V AC current to relay for powering the bulb, i'm getting following error from ESP
21:11:34.312 -> ets Jan 8 2013,rst cause:4, boot mode:(1,7)
21:11:34.312 ->
21:11:34.312 -> wdt reset
If i use 12V DC power to light the led via relay its working fine. if again use 240V power to relay to light bulb i'm get same error again.
I have already tried using ceramic capacitor for decoupling to avoid noise from AC. Still no luck. Please advice. I'm very new and naive at handling electronics.
Adding the circuit as well.
Update: After further testing, I can see following behaviour, If i connect AC bulb to relay and turn it on. Then by provide a long gap before turning it off makes the ESP stable for longer time.
Even better, if i turn off/on my mobile wifi between each time i turn on or off the AC bulb then ESP is always stable.
Adding my code as well.
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
/* Set these to your desired credentials. */
const char *ssid = "*****";
const char *password = "*********";
ESP8266WebServer server(80);
const int led = 2; //GPIO2
/* Just a little test message. Go to http://192.168.4.1 in a web browser
* connected to this access point to see it.
*/
void handleRoot() {
int size=1000;
char temp[size];
int sec = millis() / 1000;
int min = sec / 60;
int hr = min / 60;
snprintf ( temp, size,
"<body>\
<p>Status: Light ON</h1></p>\
<p><a href=\"http://192.168.4.1/on\"><h1>Turn ON</h1></a></p>\
<p></p>\
<p><a href=\"http://192.168.4.1/off\"><h1>Turn OFF</h1></a></p>\
</body>\
",
hr, min % 60, sec % 60
);
server.send ( 200, "text/html", temp );
}
void setup() {
delay(1000);
Serial.begin(115200);
Serial.println();
Serial.print("Configuring access point...");
/* You can remove the password parameter if you want the AP to be open. */
WiFi.softAP(ssid, password);
IPAddress myIP = WiFi.softAPIP();
Serial.print("AP IP address: ");
Serial.println(myIP);
pinMode(led, OUTPUT);
digitalWrite ( led, HIGH );
//URLs available to query
server.on("/", handleRoot);
server.on ( "/on", turnON );
server.on ( "/off", turnOFF );
server.begin();
Serial.println("HTTP server started");
}
void turnON(){
digitalWrite ( led, HIGH );
int size=1000;
char temp[size];
int sec = millis() / 1000;
int min = sec / 60;
int hr = min / 60;
snprintf ( temp, size,
"<body><p><a href=\"http://192.168.4.1/off\"><h1>Turn OFF</h1></a></p></body>",
hr, min % 60, sec % 60
);
server.send ( 200, "text/html", temp);
}
void turnOFF(){
digitalWrite ( led, LOW );
int size=1000;
char temp[size];
int sec = millis() / 1000;
int min = sec / 60;
int hr = min / 60;
snprintf ( temp, size,
"<body><p><a href=\"http://192.168.4.1/on\"><h1>Turn ON</h1></a></p></body>",
hr, min % 60, sec % 60
);
server.send ( 200, "text/html", temp);
}
void loop() {
server.handleClient();
}
