Raspberry Pi GPIO

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[-hh]
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Re: Raspberry Pi GPIO

Post by [-hh] » Wed Feb 14, 2018 8:16 pm

Take care. There are (tiny) differences between the models.
A good info is here:
https://raspberrypi.stackexchange.com/q ... -b-and-3-b
shiftLock happens

sphere
Posts: 706
Joined: Sat Sep 27, 2014 10:32 am
Location: Earth

Re: Raspberry Pi GPIO

Post by sphere » Wed Feb 14, 2018 9:17 pm

Thanks for that info.
Yes the Gertbot board seems also not working on rpi-3, but does on rpi-2.

But i was planning on using the Easydriver https://www.sparkfun.com/products/12779 as stepper driver together with a Raspberry. First test with one motor and then a maybe second if all goes well.
I want to have a gui, and that's for me easier in LC than any other language.

It just has to do simple things, so no fancy robot arm. For repetitive actions.
Turn so many steps one way, wait a while, then back and so forth. But it has to be precise, so therefore a stepper motor is best.

I have an Odroid C2 too (very good running Android bought at pollin.de), but i can't use, because it's used as movieplayer and my daughter will kill me if i used it :twisted:
:D :o :) :shock: 8) :lol:

sphere
Posts: 706
Joined: Sat Sep 27, 2014 10:32 am
Location: Earth

Re: Raspberry Pi GPIO

Post by sphere » Tue Feb 27, 2018 8:59 pm

Hi,

this is a very simple test stack to simply enlight a few leds, i used 1.5 Volt 20mA leds. So with 3v3 from the GPIO pins you can calculate easy which resistor you need in series with a led.
I uses the Library from Michael Doub for which i'm thankfull !
GPIO_test_led.zip
GPIO-test-led stack
(2.73 KiB) Downloaded 42 times
You can use this as a start for a simple motor-stepper driver which needs:
a PWM pulse 1 and 0 sometimes 200us.
a DIR-ection 1 or 0
ms1, ms2, ms3 so you can change the step size from Full to 16th step with combinations of 0 and 1 on each input
Eventually you could also use SLEEP and/OR ENABLE to shutoff the FET output's or the complete driver.

i bought a little driver board for 15,- euro with an A4998 ic, but you can get them for 2 euro/dollar on one of the chinese webshops, completely assembled (it's a tiny board, you can't solder the ic by hand, too little)

More next time.
:D :o :) :shock: 8) :lol:

sphere
Posts: 706
Joined: Sat Sep 27, 2014 10:32 am
Location: Earth

Re: Raspberry Pi GPIO

Post by sphere » Fri Oct 12, 2018 11:00 am

well it has been a while but i finally had a bit time to check further. (after i blew up the first raspbery... :oops: )

Motor is up and running. (Filter out the mess...)
20181012_113145.jpg
20181012_113145.jpg
So now i want to change the repeat structure to a send in time.
Attachments
20181012_113200.jpg
:D :o :) :shock: 8) :lol:

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