Nixieclock and DCF77, specific settings?

[Paul]

While waiting for the sys-file to increase the RTC clock See here I decided to go ahead and order a DCF77 module from Conrad.

I got it today and connected it to the Cronios as described in the instructions. However, it does not work 🙁 Does anybody know if some additional setting is required for this to work? I’m using Led-basic v15.1.15

Some measurements:
I’m reading 3.28 V between GND and VCC
The pulsetrains seem to be decent. See my scope image: https://www.dropbox.com/s/vr095hvcub7xc5m/dcf77_pulsetrain.png?dl=0

The pulses nicely come every second, and measuring the logical 0’s and 1’s as per the DCF77 spec seem to be OK as well:
https://www.dropbox.com/s/r5ej8bj9jwkhs6r/dcf77_pulsetrain_measure_logical_zero.png?dl=0
https://www.dropbox.com/s/d4pdf8wrs6udnpj/dcf77_pulsetrain_measure_logical_one.png?dl=0

I did have to play a bit with the pull up resistor, I now use 20 kOhm to get a 2.2 V pulse level. Maybe that is still not high enough?

• Dieses Thema wurde geändert vor 5 Jahre, 11 Monaten von Paul.

[Paul]

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• Diese Antwort wurde geändert vor 5 Jahre, 11 Monaten von Paul.

[ER-Tronik]

The DCF77-Receiver from Conrad will not work, cause it has only an open drain output. The cronios controller has a pulldown resistor integrated which cannot removed. With an external pullup resistor the voltage level is not high enouch for the cronios. The DCF77 input of cronios must be driven active high. We will sell a compatible DCF77 receiver in a few days.

[Autor]

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