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von rubem
09 Mai 2021, 18:04
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Off-topic here: I suspect the forum shrinks files above a certain size. For some unknown reason it does not accept WEBPs (way smaller than PNGs) or SVGs (vector format). For comparison, here are various files as exported from Fritzing, all with the same schematic. The WEBP was exported as a lossless...
von rubem
09 Mai 2021, 17:53
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hi again, Some quick notes about the 8833 diagram: I suspect I'll have to swap D9 and D11 so that D11 connects to the DRV8833's IN1. Reason is that D9 and D10 seem to work together for servos. I didn't test the servos yet. I still plan to add some protection diodes and/or resistors to the inputs. Be...
von rubem
09 Mai 2021, 17:42
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hi H.A.R.R.Y, The Fritzing files are available in my GitHub project: https://github.com/leosdad/fischertechnik-modules/tree/main/fritzing Coincidentally, I've pushed the DRV8833 schematics yesterday. Here are the images, GitHub shows them very nicely: https://github.com/leosdad/fischertechnik-module...
von rubem
07 Mai 2021, 22:22
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

As far as I can reconstruct the circuitry of these little no name boards, nSleep must either be pulled high by connecting the soldering bridge on its backside, or by controlling it explicitly with an additional output pin. Yes, nSLEEP is connected to VCC via a 47 kΩ resistor by default, to control ...
von rubem
07 Mai 2021, 22:11
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

juh hat geschrieben:
07 Mai 2021, 18:46
Sorry to hear about your DRV8833
Hahaha, it's indeed kaput :( I just tried another one and it works fine, so the first DRV8833 module died on me. I must have shorted some pin while breadboarding, I can't say.

Greetings,

Rubem
von rubem
07 Mai 2021, 16:24
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hi all, To @Juh: I just received an email advertising the board below, looks interesting. It's an Stm32f103c8t6 Arm Stm32, Arduino IDE-compatible and readily available at a very low price. It's a bit on the large side at 53 x 22 mm, but has some intersting specs for the price. It says it runs at 72 ...
von rubem
04 Mai 2021, 01:54
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hi everyone, I've just uploaded a Fritzing file with the current version of my test setup (i.e. still with the L293D): Fritzing_2021-05-03_20-43-02.png And the schematic: Fritzing_2021-05-03_20-42-44.png I found some discrepancies with the names I gave to the pin numbers, sao I've corrected them in ...
von rubem
03 Mai 2021, 15:24
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hi Juh, Yes, this thread has grown a lot. Here are some quick points, with no quotes in an effort to make the text a bit shorter ;) Thanks for the WeFish link, I probably looked for "we fish" (with a space) and got nothing. It's good you're going back to the encoder project, I don't see any problems...
von rubem
30 Apr 2021, 22:41
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hi H.A.R.R.Y and MoG, That is okay for me. But please do not assume I will work on this particular project with highest priority. I have some other stuff that I want to play around with. Of course. In fact, don't we all? ;) With these step down converters I have no experience, they look as if they m...
von rubem
30 Apr 2021, 17:24
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Here's an much better drawing of the "alternative Automated Robots" diagram. I also shows that even with all 4 motors and 8 push-buttons (the 4 models in the kit never use them all at the same time), there still would be room for additional hardware: four servos, 6 sensors and 8 LEDs. The LED/sensor...
von rubem
30 Apr 2021, 15:21
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hi H.A.R.R.Y, Your setup is quite clear and nice. It is exactly this "building block" approach that I am also thinking about. Good, that's how it should be IMO. However a second look at the last diagram I've uploaded tells me there is still too much wiring to do. Maybe that's unavoidable... but I re...
von rubem
30 Apr 2021, 01:44
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Here's an idea in the form of another pseudo-diagram, showing a way to use these DIY modules to replace the TX/TXT -- for existing models. This would be for the Automation Robots kits.
Automation robots.png
Automation robots.png (145.89 KiB) 544 mal betrachtet
von rubem
30 Apr 2021, 00:09
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Okay, so here's some of my vision for the whole thing: The areas that interest me most with this project are the design and user experience. I want to create a set of modules that are as easy to use as possible, so with just a few blocks of controller code powerful things can be achieved. That is, I...
von rubem
29 Apr 2021, 23:47
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Oops --- must have pressed Enter too soon, sorry...
von rubem
29 Apr 2021, 23:45
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hello H.A.R.R.Y., I do not know what exact non-linearity you might have in mind. Sorry, I didn't really explain what I had in mind. I refer to the fact that the 8 speeds in the TXT do not behave linearly. From a user's point of view, speed 4 should mean something around half the full speed; speed 2 ...
von rubem
29 Apr 2021, 01:47
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hi again, The diagram below (not a schematic, it's just a drawing) shows an example of what I have in mind. This is an hypotetical model with one encoder motor, an S motor with two limit switches, an I²C ultrasonic module (not the ft one) and a small OLED display: Diagram.png The ugly controller at ...
von rubem
28 Apr 2021, 21:32
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hi Jan, I very much like your module approach, your sketches look really cute. Thanks! I hope I'm getting somewhere with all this ;) I agree that an additional line is not elegant. However I expect it to be much easier and reliable than other aproaches,e.g. I2C multi master or the master constantly ...
von rubem
28 Apr 2021, 00:09
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Hi H.A.R.R.Y, we are not so way apart with the basic idea I'm glad we are thinking similarly, maybe I'm on the right track here :D Having also inputs it should be possible to read in stop switches as well as standard and quadrature encoders. Take a look at calcPulseWithQuadrature() in my code, I use...
von rubem
27 Apr 2021, 02:05
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hi again, Perhaps I should have shown you this: Designer_2021-04-26_21-02-32.png The idea is to make some small modules to use with ft. They must be simple to construct, inexpensive, and encapsulate enough functionality so they are simple to use as possible for the controller's standpoint. So I'll t...
von rubem
24 Apr 2021, 19:47
Forum: Community-Projekte
Thema: DIY I²C motor driver with Arduino
Antworten: 40
Zugriffe: 2268

Re: DIY I²C motor driver with Arduino

Hi Karl, Harry, Jan (and others): I will answer you all, I'm very interested in the subject. I've been quite busy with other tasks and several new parts arrived in the meantime, But I'll be back here very soon.

Cheers!

Rubem