Closed wintermutepi closed 10 years ago
Do you have at least one PT100 sensor?
Yes, two of them.
The setup contains the following components:
The PT100s are attached to the heating pipes with cable straps.
"Hardware defekt" will only be shown if either the internal temperature/humidity sensor does not work correctly, or if the PT100 sensors don't work correctly. No idea which of the two you've run into.
Just tried to start up with the PT100s disconnected from the power supply unit. Same error screen.
At least one of them has to be connected properly. If you're sure that both of them are, please bring the unit back for a closer examination.
Connected the two PT100s again. After another half a dozen power cycles, it now seems to work as expected - I don't dare touch it.
I investigated this issue with the following result:
"Hardware Defekt" is shown in three cases:
You have an uncalibrated power board. That means, the analog sensor doesn't behave as expected. At ambient temperature I measured an output voltage of the PT100s of about 90% of the upper limit. So if you had a slightly warmer ambient temperature or even connected the PT100s to your heater, the upper limit was reached and caused the error.
Fix: After calibrating the power board, it should not run into the upper or lower limits. Workaround: Do not expose the PT100s to a heat source.
The epaper display shows the message "Fehler: Hardware defekt" Doing a power cycle doesn't solve the problem effectively.
After plugging the display device in, screens are shown in this sequence:
(1) Black screen, fading to (2) White screen (3) "EMOS Raumsensor Fraunhofer ITWM" (black background) (4) "EMOS Raumsensor Fraunhofer ITWM" (white background) (5) "EMOS Raumsensor Fraunhofer ITWM" (black background) (6) White screen (7) "Fehler: Hardware defekt" (black background), fading to (8) "Fehler: Hardware defekt" (white background)
I repeated this a couple of times by plugging out and in the a/c adaptor.
Twice, after screen (6), a picto screen with plausible temperature / humidity values was shown for approx. 20 seconds, but was subsequently replaced by the "Fehler" message.