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Page: technics-robots-R7-construction_en.htm
Date: 2017.11.19 14:30:33 (UTC+1)
Name: Dusseldorf Doug

Hi Norbert, just to follow up on the video and write up.
1) you connect the output (5v) of the DC-DC to the 5v and Gnd pins of the GPIO.  there for you power the Pi from these pins. correct?
2) the double H bridge is powered by the batteries direct this voltage may/will vary over time, but the motors and bridge are  OK?
Any Significance to the GPIO pins used to control :
3) the double H bridge.  (3.3V signal?)
4) LEDS the N Channel MOSFITs 2N7000 (3.3V signal)?
5) input from voltage divider?

Me: (1) Yes
(2) Yes. That's how they are connected in the original configuration as well. The car gets slower over time and you must recharge whenever it is significantly slower than with fresh batteries (there is no deep discharge protecion).
Connect the GPIOs as shown in the wiring scheme.
(3) Yes, as demonstrated in the video 3.3V are okay.
(4) Yes, the 2N7000 will be on at 3.3V
(5) Yes, the battery voltage is only on the input of the voltage divider. The potential at the outputs (GPIOs) is lower than 3.3V so there is nothing to worry. Furthermore I have chosen high resistance values (47kΩ) so even in worse case of wrong adjustment, the Raspberry Pi should not get damaged.


Page: technics-robots-R7-construction_en.htm
Date: 2017.11.11 08:21:05 (UTC+1)
Name: Dusseldorf Doug

Thanks Norbert!  I really like that you put some additional detail into the voltage detection.  Understanding how to provide 'portable power' from basic components is a big topic.  It is difficult to find on the internet.  So, thanks for the extra detail, I encourage you for more!  :)


Me: More about that will follow with my next rover, that is a large one with lots of payload capabilities and so for sensor add-ons. The base car arrived yesterday.


Page: technics-robots-R7-construction_en.htm
Date: 2017.11.10 21:37:36 (UTC+1)
Name: Michael Sinitsin

Great writeup and clear explanation! Thanks!

Me: You're welcome!