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by Brunobaer
Wed May 02, 2018 10:46 am
Forum: HATs and other add-ons
Topic: Gertbot
Replies: 146
Views: 49953

Re: Gertbot

the built-in freewheel diode is mandatory to switch the directions. The spikes I am talking about are coming from the commutator on the rotor, which Switches the coils on the rotor of the brushed motor. Unfortunately I was not able to see them on the oscilloscope, because it is a very old analog one...
by Brunobaer
Tue May 01, 2018 7:15 am
Forum: HATs and other add-ons
Topic: Gertbot
Replies: 146
Views: 49953

Re: Gertbot

Hello Gert, this seems to me possible. I know this Problem with the very fast CPU from Counters, which also count the Spikes. But it cannot be the current spike, because the current in an inductivity (coil) is not able to jump! It is the voltage that causes the Spikes. If You disconnect an inductivi...
by Brunobaer
Mon Apr 30, 2018 2:22 pm
Forum: HATs and other add-ons
Topic: Gertbot
Replies: 146
Views: 49953

Re: Gertbot

Gert, Thanks for the fast reply. In the second endurance test I forgot to tell, that I only run the duty cycle by 75% and in the first test at 100%. As there was really only the locomotive running, a too high current seems to me not the root cause, as I understood the specification right, each chann...
by Brunobaer
Mon Apr 30, 2018 9:34 am
Forum: HATs and other add-ons
Topic: Gertbot
Replies: 146
Views: 49953

Gertbot endurance test

Hello Gert, thanks very much for the „Gertbot“ which gives me the opportunity to run model trains with a RPI A+ via Wifi (WLAN0). Unfortunately I killed up to now two gertbots and I hope, You can help me to reanimate them. What I did: I put the gertbot (Vers. 2.6) on a rpi A+ and connected two dc-br...

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