General > General Technical Chat
Mystery optical(?) connector
grumpydoc:
My "dead" unit turned up today. Don't know how dead yet as I've had time to take it apart but not to turn it on :-/O
Mike was right, just a hole above an IR diode/phototransistor - the device looks like a SFH 7221
Steibel confirmed they do not sell the cable any more so DIY is the only option. They don't have the software either and, so far, the links above are dead. That probably is no great loss as I'll want to use a Pi or something similar for the interface.
Two board construction. Small linear PSU, 80C32 MPU, 4153 RTC with 0.1F supercap and 81C91 CAN bus controller are the main points of interest.
EDIT: Software is at http://www.kromschroeder.de/heizwaerme/produkte/downloadbereich.html
EDIT2: Just noticed this is a WPM controller, not WPM2; doesn't really matter for this use. It also appears to work - at least the MPU and user interface stuff, remarkably this is after an unfortunate experience with 240V and the CAN bus VCC rail. :-BROKE. Note to self, when feeding mains into unlabelled PCB which has a LOT of spade connectors to choose from double check that the orientation of the board matches the orientation of the detached rear panel with the labels on :(
mzutg:
Hi,
did you have any luck connecting to the board?
Best
grumpydoc:
Not yet - haven't had any time to look at it.
fredmoro:
Helloo!
I have a WPL 18 Cool heatpump, with WPM II controller. And I think I could communicate with it, using the optical interface.
I use a raspberry pi, and an IR LED + photodiuode connected to the pi serial uart. The photodiode and the IR LED salvaged from an old ball mouse. The optical elements are too big to fit in the hole, so I used optic fibers to connect them to the wpm ii. Soon will post some photo of it ...
So it semms working - I'm trying to read all the info gathered on this forum, and the links above... Now I can read some response on the serial port, but don't know what they mean...
Do you have any progress?
amyk:
I wouldn't call that a connector so much as it is a hole with a sensor in it.
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