Die Suche ergab 230 Treffer

von fotoopa
27 Sep 2020, 16:23
Forum: Modellideen & -vorstellung
Thema: Setup with the new DE0-Nano-Soc board.
Antworten: 7
Zugriffe: 1130

Re: Setup with the new DE0-Nano-Soc board.

With the new acquisition, a 4 channel analog scope, it is again easier to make measurements. The scope has a bandwidth of 50MHz and a sampling up to 1 Gs/sec. An extra large buffer makes a deep analyze possible. The scope is connected to 4 coax 50 ohm cables. To have no extra distortion of the signa...
von fotoopa
21 Sep 2020, 17:27
Forum: Modellideen & -vorstellung
Thema: Setup with the new DE0-Nano-Soc board.
Antworten: 7
Zugriffe: 1130

Re: Setup with the new DE0-Nano-Soc board.

The harware with the DE0-nano soc module for the TXT Controller is ready. Controller with DE0-nano soc module. This controller works together with the TXT controller of Fischertechnik via an I2C connection. The TXT is connected to the PC. With this own controller a lot of extensions are possible. Al...
von fotoopa
01 Sep 2020, 09:03
Forum: Modellideen & -vorstellung
Thema: Startschuss zu einem neuen Grossprojekt.....
Antworten: 9
Zugriffe: 753

Re: Startschuss zu einem neuen Grossprojekt.....

Ich hatte auch ein Video. Dies illustriert die Funktionsweise der verschiedenen Module.

https://youtu.be/yZnnx5vvjQU

Frans.
von fotoopa
31 Aug 2020, 16:59
Forum: Modellideen & -vorstellung
Thema: Startschuss zu einem neuen Grossprojekt.....
Antworten: 9
Zugriffe: 753

Re: Startschuss zu einem neuen Grossprojekt.....

Early 2018 I also assembled a number of modules. The control was via the TXT controller and a FPGA module that was connected via I2C. On the TXT control you can see better the different modules. Here are some links to the images: https://www.flickr.com/photos/fotoopa_hs/28132493079 https://www.flick...
von fotoopa
29 Aug 2020, 13:04
Forum: Modellideen & -vorstellung
Thema: Setup with the new DE0-Nano-Soc board.
Antworten: 7
Zugriffe: 1130

Re: Setup with the new DE0-Nano-Soc board.

Final assembly of the DE0-nano soc board for the fischertechnik control unit. Different connections can be provided via separate side plates. Because of this I have a more more flexible assembly. The TXT controller is connected via I2C. On the backside are already 4x SPI connectors and the I2C conne...
von fotoopa
20 Aug 2020, 19:47
Forum: Modellideen & -vorstellung
Thema: Setup with the new DE0-Nano-Soc board.
Antworten: 7
Zugriffe: 1130

Re: Setup with the new DE0-Nano-Soc board.

Basic housing for 6x motor control. Now I have to 3D print the cover and assemble everything. SPI refresch cycle is 14 usec. Besides the 6 motor outputs there are 24 digital inputs. These are connected via the cover. On top of that there is a rotary encoder, 4 pushbuttons and 2 leds that indicate wh...
von fotoopa
10 Aug 2020, 09:35
Forum: Modellideen & -vorstellung
Thema: Setup with the new DE0-Nano-Soc board.
Antworten: 7
Zugriffe: 1130

Re: Setup with the new DE0-Nano-Soc board.

I just make these modules for the fun of building something. They are very cheap and useful on all my DE0-nano versions. SPI is very simple and not time critical. The clock may even change between near DC to very high speeds during the transfer. So they are also suitable for micro controllers. In th...
von fotoopa
07 Aug 2020, 16:40
Forum: Modellideen & -vorstellung
Thema: Setup with the new DE0-Nano-Soc board.
Antworten: 7
Zugriffe: 1130

Re: Setup with the new DE0-Nano-Soc board.

More digital fast speed inputs (96) and outputs via spi modules. I made a basic spi module with 3x 74hc165 and 3x 74hc595 chips. On this basic module I can place different types of outputs. In total I provided 4x spi connections on the DE0_Nano soc board. With the existing step motor module together...
von fotoopa
07 Jul 2020, 15:32
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 29
Zugriffe: 2787

Re: Encoder problem

Thanks for both pictures with the data of the FT motors. I understand they mention 21.3 ratio. The error is small so this rounding will give little problems with normal use. I'm staying with my results of the measurements. The max measurement error I can have is +- 1 pulse on a total of 1000000 puls...
von fotoopa
05 Jul 2020, 17:41
Forum: Modellideen & -vorstellung
Thema: Setup with the new DE0-Nano-Soc board.
Antworten: 7
Zugriffe: 1130

Setup with the new DE0-Nano-Soc board.

The first start with this beautiful new board goes very smoothly. The SPI connection has already been tested. It makes every 14 usec a new scan of the 24 inputs and the 24 outputs. The I2C connection with Fischertechnik's TXT-Controller is also tested and works at full speed. The LCD display with 4x...
von fotoopa
30 Jun 2020, 17:06
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 29
Zugriffe: 2787

Re: Encoder problem

I think all the readings are almost correct now. Except for the old type FT engine which really does have a reduction of 25, the other types are not integer values. I repeated the measurements with a higher resolution with the hardware counters now having 24 bit. This way they can handle a very larg...
von fotoopa
28 Jun 2020, 10:32
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 29
Zugriffe: 2787

Re: Encoder problem

Hello, Helmut, You make great efforts to determine the correct reduction factor of the engine. You try it with only a software solution. The weak point is still the TX or TXT controller. They are not suitable to measure reliable pulses at a higher speed. A second weak point is your mechanical switch...
von fotoopa
23 Jun 2020, 14:51
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 29
Zugriffe: 2787

Re: Encoder problem

The old version encoder motor was delivered by Amazon on 22 April 2018. From the Fischertechnik 511933 - TXT Automation Robots. Motor reducion: 25,3906. Picture show the wrong ration of 25,4! Fischertechnik encoder motor FT-135484 Detail of the motor: https://live.staticflickr.com/930/43941681551_1b...
von fotoopa
22 Jun 2020, 09:06
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 29
Zugriffe: 2787

Re: Encoder problem

Hey Frans, This is a tricky and fun one problem! 25 25 26 27 -- * -- * -- * -- = 25.390625 deltaRatio=0.000008 => counts=761718.75 countDiff=0.25 9 10 12 16 Maybe it's the last gear combination, at least it looks realizable and it deviates just a quarter of a tic from your measurement result. By th...
von fotoopa
21 Jun 2020, 17:41
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 29
Zugriffe: 2787

Re: Encoder problem

Hello Helmut, Thank you very much for the many details. Sorry about my late reaction. Because of the party yesterday, the grandchildren only returned home this afternoon. I've been able to make some new tests to see if there were any measurement errors. I can confirm that my results are still stable...
von fotoopa
19 Jun 2020, 19:41
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 29
Zugriffe: 2787

Re: Encoder problem

Hello Frans, Yes I know, this sight is hard to bear, but the patient survived (-; My little surgery - I counted twice - resulted an exact 1/25 ratio, at least with one of mine old type encoders. Helmut I have no reason to doubt your count. I adjusted my measuring setup to connect the FT encoder on ...
von fotoopa
19 Jun 2020, 14:22
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 29
Zugriffe: 2787

Re: Encoder problem

very interesting results, Frans. First of all it is really astonishing, that Fischertechnik delivers such unsoldered electronics part. It clearly shows they do not have reasonable electrical testing in place or rely on insufficient quality of their suppliers. I'm rather generous in the judgment. I ...
von fotoopa
18 Jun 2020, 10:51
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 29
Zugriffe: 2787

Re: Encoder problem

Encoder motor old type FT-135484. The purpose of this test is to measure how many pulses/revolutions the encoder gives out. It also measures the correct gear reduction ratio. To measure this correctly, I placed an encoder disc on the output shaft. Connected to it is a quadrature decoder. The disc ha...
von fotoopa
17 Jun 2020, 19:43
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 29
Zugriffe: 2787

Re: Encoder problem

The encoder test. The purpose of this test is to measure how many pulses/revolutions the encoder gives out. It also measures the correct gear reduction ratio. To measure this correctly, I placed an encoder disc on the output shaft. Connected to it is a quadrature decoder. The disc has 25 magnets so ...
von fotoopa
15 Jun 2020, 13:04
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 29
Zugriffe: 2787

Encoder problem

Fischertechnik TXT Smart Home set with 2 encoder motors. Today I wanted to use my new encoder motor from the Smart Home set. I'm sorry, but it wouldn't run. As an old technician you're going to see what's going on inside. To my big surprise I saw that the connection pins of the motor as well as the ...