Does Renard send high or low signal to the SSR's.

[lytnin]

Hi all,
I've been out of the loop for a while, both for medical reasons and then trying to play catchup with work.

Anyway, I haven't had the time to do anywhere near as much display work/research as I'd have liked, so I'm heading straight into the deep end and going with Renard.

I have my original SSR's that I used on my Olsen595 (Peter's original design) that receive a high signal to turn them on. My question is, will they work with Renard :?:

From memory and a quick glance through the Wiki, Renard sinks 5V to activate the SSRS's. Is this configurable, or am I going to need to modify/replace my existing SSR's :?:

Cheers

[P. Short]

The latest firmware (20070907) can be configured either way, and all of the coop boards that I've worked on have both ground and +5V available on the connectors. However, nobody really has any experience in working with Renard when it is sourcing current for the SSRs, so the support may be a bit sketchy.

--

Phil

[xmus]

So the current design takes 10mA @ 5V from the pic to the (start SSR here) opto-triac, and the opto-triac switches the SSR's with 120V.

Just out of curiosity, how is that different from the older design? Was there a time when the 120V signal from the opto-triacs went down cat 5? Or was it just a different voltage to the opto's?

[P. Short]

The difference is whether the output of the PIC is connected to the anode or the cathode of the opto-isolator. The current coop SSR boards were designed to work with the 595 chips (active-high output) followed by a ULN2803 (which inverts the signal), and the input of the SSR is to the cathode of the optos. The original design did not have the ULN connected to the output of the 595, and so the output of the controller (the 595 chip) went to the anode of the optoisolators.

The AC side has always been pretty much the same as the current design.

--

Phil

[xmus]

The difference is whether the output of the PIC is connected to the anode or the cathode of the opto-isolator. The current coop SSR boards were designed to work with the 595 chips (active-high output) followed by a ULN2803 (which inverts the signal), and the input of the SSR is to the cathode of the optos. The original design did not have the ULN connected to the output of the 595, and so the output of the controller (the 595 chip) went to the anode of the optoisolators.

The AC side has always been pretty much the same as the current design.

--

Phil

So from the Renard perspective, since pic's are programmable, you are programming the pics such that we do not require the inverter....

[john]

I've been playing about with the new firmware and found that its ON/OFF is 0/2.5v then after reading the specs of the 16F688 i found that it does state the output is cmos(2.5v).
So my next step was to use ULN2801 as that accepts cmos inputs and each channel can switch 500ma at 50v, ideal for using with LED's