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von fotoopa
30 Jun 2020, 17:06
Forum: Tipps & Tricks
Thema: Encoder problem
Antworten: 26
Zugriffe: 1339

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: 26
Zugriffe: 1339

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: 26
Zugriffe: 1339

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: 26
Zugriffe: 1339

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: 26
Zugriffe: 1339

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: 26
Zugriffe: 1339

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: 26
Zugriffe: 1339

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: 26
Zugriffe: 1339

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: 26
Zugriffe: 1339

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: 26
Zugriffe: 1339

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 ...
von fotoopa
08 Jun 2020, 11:49
Forum: Robo Pro / Computing / Software
Thema: Analysing 2 errors at the TXT-Controller.
Antworten: 16
Zugriffe: 730

Re: Analysing 2 errors at the TXT-Controller.

Maybe the end-user section of the SLI fischertechnik GitHub could be interesting for you too. Ik ben al enkele dagen mij aan het verdiepen in deze materie. Ik heb nog heel veel vraagtekens maar eerst moet ik alles nog wat beter lezen en begrijpen. De SLI lib op zich begrijp ik. Waar het nog onduide...
von fotoopa
02 Jun 2020, 10:28
Forum: Robo Pro / Computing / Software
Thema: Analysing 2 errors at the TXT-Controller.
Antworten: 16
Zugriffe: 730

Re: Analysing 2 errors at the TXT-Controller.

Thanks for the info. It was the first time I wanted to boot from the SD card. With your help, I managed to run the new pre-release on the TXT successfully. The sys version show now 4.7.0.0 Correction of the above mentioned errors is not there. The same problems remain. On the positive side, I can no...
von fotoopa
01 Jun 2020, 19:30
Forum: Robo Pro / Computing / Software
Thema: Analysing 2 errors at the TXT-Controller.
Antworten: 16
Zugriffe: 730

Re: Analysing 2 errors at the TXT-Controller.

I'm trying to start the TXT from an sd card. The used file comes from: https://github.com/fischertechnik/FT-TXT/releases . On the txt sys settings I switched on the sd load on. The SD sym show up in the tab at the top off the TXT. I formatted an 8Gb micro sd card in fat32 and put the file ft-TXT_Bui...
von fotoopa
31 Mai 2020, 19:21
Forum: Robo Pro / Computing / Software
Thema: Analysing 2 errors at the TXT-Controller.
Antworten: 16
Zugriffe: 730

Re: Analysing 2 errors at the TXT-Controller.

@fotoopa Did you also tested the I2C with firmware 4.7.0 pre-release? I don't expect a different result because it is not mention as resolved. No, I'm pretty scared of the pre-release versions. I did check if there was a new final version. I only have one piece of TXT. If something goes wrong I hav...
von fotoopa
31 Mai 2020, 18:57
Forum: Robo Pro / Computing / Software
Thema: Analysing 2 errors at the TXT-Controller.
Antworten: 16
Zugriffe: 730

Re: Analysing 2 errors at the TXT-Controller.

Yeah, I understand. But we have to distinguish between the 2 problems, the 100/400 Khz and the locking of the Robobro program on the I2C access. Once the TXT is at 400 Khz, there is still the timeout that causes a deadlock in the on-line mode. At that time there is no change of clock speed. On the o...
von fotoopa
31 Mai 2020, 17:13
Forum: Robo Pro / Computing / Software
Thema: Analysing 2 errors at the TXT-Controller.
Antworten: 16
Zugriffe: 730

Re: Analysing 2 errors at the TXT-Controller.

I always monitor both signals SCL and SDA during my tests on the scope. There are simply no signals coming out of the TXT in "online mode" after a time-out error. The levels just remain high. I don't think the problems have anything to do with the bus and/or load. All my tests are nicely repeatable....
von fotoopa
31 Mai 2020, 15:28
Forum: Robo Pro / Computing / Software
Thema: Analysing 2 errors at the TXT-Controller.
Antworten: 16
Zugriffe: 730

Re: Analysing 2 errors at the TXT-Controller.

This offline prog run always @400Khz after the time-out even after a powerup.

Bild

Frans.
von fotoopa
31 Mai 2020, 13:27
Forum: Robo Pro / Computing / Software
Thema: Analysing 2 errors at the TXT-Controller.
Antworten: 16
Zugriffe: 730

Re: Analysing 2 errors at the TXT-Controller.

It has also been check with 4.6.6 and reported by me on the TXT issue page: https://github.com/fischertechnik/FT-TXT/issues/12 Yes, I'm sorry I didn't post any direct links to the earlier references. I wanted to mention these bugs again in the hope that there would be a solution from the FT team. I...
von fotoopa
30 Mai 2020, 18:38
Forum: Robo Pro / Computing / Software
Thema: Analysing 2 errors at the TXT-Controller.
Antworten: 16
Zugriffe: 730

Analysing 2 errors at the TXT-Controller.

Two errors have already been reported several times but so far no solution has been found. Both errors are about the I2C device. The first error is the clock speed of the I2C. It always starts up with 100 Khz after a powerup of the TXT-Controller. The second error is that the I2C stops working if wi...
von fotoopa
28 Mai 2020, 20:05
Forum: Modellideen & -vorstellung
Thema: A swing with Playmobil and Fischertechnik building blocks.
Antworten: 3
Zugriffe: 347

Re: A swing with Playmobil and Fischertechnik building blocks.

Hallo Esther, The neodym magnet into the 15x15x10mm blocks are D5x5mm, these into the rotor are D5x10mm. But the thickness is not critical. If you took them all the same thickness, it would go too. The rotor diameter has 25mm. Motor is XM-motor. You do have to adjust the motor speed for maximum move...