automatic switching of the GPIO

[ssd]

Hello,

I have implemented a 4 relay circuit using ESPeasy and domoticz at my home and it's been 2 months now!! But nowadays relay connected to GPIO 4 switches off randomly without any reason. I checked the log but the connection between ESP and raspberry pi is active but still, the relay switches off. Can someone help me with this issue?

[Ath]

Is your relay input 5V or 3.3V? It may be that the relay input isn't stable enough at the high level of the ESP (3.3V) if the relay is for 5V.

[TD-er]

Also make sure you don't have the same IDX active on other nodes. (notorious is using IDX 0 )

[ssd]

Is your relay input 5V or 3.3V? It may be that the relay input isn't stable enough at the high level of the ESP (3.3V) if the relay is for 5V.

But ESP8266 has no provision of 5V on its GPIO so we are bound to use 3.3V. And on checking using multimeter the input to the relay is 3.12 V and another relay switches at the same voltage.
So it is really tough to understand the issue

[ssd]

Also make sure you don't have the same IDX active on other nodes. (notorious is using IDX 0 )

No, the index is not the same. ESP8266 or raspberry pi cannot handle the load over a period of time, is that an issue?

[Ath]

But ESP8266 has no provision of 5V on its GPIO so we are bound to use 3.3V. And on checking using multimeter the input to the relay is 3.12 V and another relay switches at the same voltage.

Well, you can use a level converter for that (a transistor and a few resistors can make you one). 3.12V is just around the borders of acceptable for a high input signal, so, some will work and sometimes it will work, but it most likely it's unstable, as you have found out.
Can you confirm that it is indeed a 5V high-active relay? A standard ESP port can only deliver up to around 25 mA, so that may be a bit low to directly activate a relay, but should be enough for a relay-board to switch. And relay-boards usually are 3.3V compatible.

[ssd]

But ESP8266 has no provision of 5V on its GPIO so we are bound to use 3.3V. And on checking using multimeter the input to the relay is 3.12 V and another relay switches at the same voltage.

Well, you can use a level converter for that (a transistor and a few resistors can make you one). 3.12V is just around the borders of acceptable for a high input signal, so, some will work and sometimes it will work, but it most likely it's unstable, as you have found out.
Can you confirm that it is indeed a 5V high-active relay? A standard ESP port can only deliver up to around 25 mA, so that may be a bit low to directly activate a relay, but should be enough for a relay-board to switch. And relay-boards usually are 3.3V compatible.

The relay is a 5v active relay. but all the 3 relays are the same and others are operating efficiently

[TD-er]

[...]
The relay is a 5v active relay. but all the 3 relays are the same and others are operating efficiently

That's what Ton suggested... With a lower than usual driving level the tolerances of parts may have a lot more effect.

[ssd]

[...]
The relay is a 5v active relay. but all the 3 relays are the same and others are operating efficiently

That's what Ton suggested... With a lower than usual driving level the tolerances of parts may have a lot more effect.

So i should use level converter in between ESP and relay. Am I right?

[TD-er]

Yes, or simply a transistor to switch the relay.
This transistor can be your level converter.

Something like this:


This schematic assumes your relay to be connected with one pin to the higher voltage (e.g. 5V rail) and you connect them to GND via the transistor.

The diode is meant to protect the transistor when the relay is released (no more current through the coil)

[ssd]

Thanks, everyone!!! Using 5V worked perfectly for me!

[TD-er]

Good to hear.
Thanks for the update