@Mars, thanks for the info! I will try to set up mine too as soon as possible. Keep us posted on your results!
Jan
Gas/Water/Electricity/Solar System/Temperature/Humidity sensor reading & logging
(47 posts) (7 voices)-
Posted 3 months ago #
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After 3 weeks the RF power monitors for my solar system finally came in:
Now finding time to solder the Conrad 868Mhz receiver, getting the OOK receiver code working, send it to the JeeLink, and reading it into the PC...
I guess that will take more than 1 hour of my spare time ;-)
Posted 3 months ago # -
Ok. Small problem...
I got the Conrad 868Mhz receiver hooked up (Analog Input, Port 2), and loaded the ookDecoder sketch, but I don't receive anything...
Looking at the specs of the receiver, it says LOW 0v, and HIGH +0.8V. The sketch mentions " // use analog comparator to switch at 1.1V bandgap transition".
Might it be that the +0.8V is not recognized as a logic "1", and hence I don't receive a thing as the JeeNode always detects a logic "0" ?
It is weird though, as the 433Mhz receiver from Conrad has the same specs, but that's the one jc used in his daily weblog (April 2010).
Posted 3 months ago # -
Did you enable the pull-up resistor? Might just pull it over the edge...
One way to check what's happening is to turn a LED on and off to match the input signal. If it doesn't blink, you've really got no usable signal. A transistor or op-amp may be needed to resolve this.
I don't recall running into this sort of problem. Strange.
Posted 3 months ago # -
Yup:
pinMode(13 + PORT, INPUT); // use the AIO pin digitalWrite(13 + PORT, 1); // enable pull-up...is what the Setup in the sketch does (I have nothing changed in the sketch from svn).
Posted 3 months ago # -
I am not sure what kind of receiver you use , do you use the RX868-3V 0552670c http://www.elv.de/output/controller.aspx?cid=74&detail=10&detail2=12822&flv=1&bereich=&marke=
Posted 3 months ago # -
Nope, not that one. JC uses that one, but I'm using Conrad #190939:
The data output circuit of the receiver looks like this:
.Might be the diode that's responsible for the 0.8V HIGH level??
And BTW: I have no idea what for transistor circuit could solve the level problem (if that's the problem, and not some soldering mistake of mine)...
Posted 3 months ago # -
Another thing to try, if you haven't already: power the receiver from PWR i.s.o. +3V.
Posted 3 months ago # -
Ok. I will try that.
However, the problem seems to be very old as you can read in this dutch posting from 2004 about the Conrad receivers
A simple single transistor level conversion will also flip levels, so that's also something I don't want actually...
Posted 3 months ago # -
Mars, here is some more info from elektor http://jap.hu/electronic/rf/el9805.pdf I think it's almost the same circuit,but maybe you found this already.
The logic high level is at about 2/3 of the supply voltage, i.e., between 3 V and 4.5 V. this is different from your conrad device.
Posted 3 months ago #
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