Fehler: Hardware defekt

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The HexaBus Project: An IPv6-based home automation bus. We develop both hard- and software for the future of home automation.

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Fehler: Hardware defekt #201

Closed wintermutepi closed 10 years ago

wintermutepi commented 10 years ago

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.

ghost commented 10 years ago

Do you have at least one PT100 sensor?

wintermutepi commented 10 years ago

Yes, two of them.

The setup contains the following components:

epaper display unit, connected with white flat RJ45 cable to
power supply unit, connected to
ac adaptor
heating flow sensor attached to power supply unit with red rubber cord
heating return sensor attached to power supply unit with red rubber cord

The PT100s are attached to the heating pipes with cable straps.

ghost commented 10 years ago

"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.

wintermutepi commented 10 years ago

Just tried to start up with the PT100s disconnected from the power supply unit. Same error screen.

ghost commented 10 years ago

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.

wintermutepi commented 10 years ago

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.

domke commented 10 years ago

I investigated this issue with the following result:

"Hardware Defekt" is shown in three cases:

the digital sensor is malfunctioning
the analog sensor (PT100) is at its upper limit
the analog sensor (PT100) is at its lower limit

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.