Hi,
I have recently purchased and emontx v3 + rfm12b and RFM12Pi + raspberry Pi. I would appreciate it if somebody could explain to me how to control a 3 channel relay using the aformentioned combination.
Thanks in advance
How to add Relay
Submitted by Guest on Sat, 25/01/2014 - 18:03»
Re: How to add Relay
What do you want to use the relay for?
Where do you want the relay to be located? EmonTX or Pi
Re: How to add Relay
Hi,
I would like to connect the relay to control a mains electricty signal. It would actually be the same signal that the emon tx 3 is sampling. It can be located at either the pi or the emon tx.
Re: How to add Relay
I am interested too, We want to switch off the power supply remotely via Emoncms. Is it possible?
Thanks.
Re: How to add Relay
The easy answer is to add the output interface used here: Diverting surplus PV Power, by Robin Emley
It is not a relay, it is a triac, but when constructed correctly according to the instructions you have isolation between the mains and the low voltage circuit, and it can switch up to 40 A when equipped with the appropriate heat sink. Robin can supply PCBs and possibly the complete kit.
For 3 channels, you would need three identical units.
To control this from emonCMS, you would need to send a control signal back. I think there is a separate thread about that.