My day 3: build a gsm monitor/alarm for a pump house

[mainline]

Seems to be working ok, as in texting and calling.


The mains relay's I have used are getting too hot, seems that the led resistor is of the wrong value so are dissipating too much heat.

Have started to do it another way for the mains monitoring.

 

[James]

G2R-1-SN AC230(S) | Omron Plug In Power Relay, 230V ac Coil, 10A Switching Current, SPDT | RS

uk.rs-online.com

and

P2RFZ-05-E | Omron P2RFZ 250V ac Surface Mount Relay Socket | RS

uk.rs-online.com

is what i would normally use for something like that.

 

[DefyG]

Seems to be working ok, as in texting and calling.

View attachment 117772
The mains relay's I have used are getting too hot, seems that the led resistor is of the wrong value so are dissipating too much heat.

Have started to do it another way for the mains monitoring.

View attachment 117774

Could you not clamp a big heat sink across the relays

 

[DefyG]

Seems to be working ok, as in texting and calling.

Maybe too late now, but didn't one of the forum sponsors 'RF Solutions' have something 'off the shelf' that would do, rather than have to build one yourself?

 

[mainline]

Maybe too late now, but didn't one of the forum sponsors 'RF Solutions' have something 'off the shelf' that would do, rather than have to build one yourself?

Not for a total build of less than £100

 

[mainline]

G2R-1-SN AC230(S) | Omron Plug In Power Relay, 230V ac Coil, 10A Switching Current, SPDT | RS

uk.rs-online.com

The mains relays were just what i had, turns out they were Chinese copies.

 

[DefyG]

Not for a total build of less than £100

ah well no, maybe (definitely) not!