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+--- Thread: no motor controller (/showthread.php?tid=3885)
no motor controller - SYWindveer - 2022-01-20
My new Tinypilot HAT won't talk to my DIY motor controller.
On my motor controller I am using a level shifter as I could not source the CPC5001 device U1 in the schematic
The new hat does have the resistors and a device U7 but does not talk with the controller via the level shifter.
I can try and wire directly to the RasPI header, but I prefer to have a protected UART interface.
Any ideas why my setup does not work?
Thanks,
RE: no motor controller - ironman - 2022-01-20
Just checking - you connected the pi's tx to arduino controller's rx and vice versa, right?
RE: no motor controller - SYWindveer - 2022-01-21
(2022-01-20, 11:07 PM)ironman Wrote: Just checking - you connected the pi's tx to arduino controller's rx and vice versa, right?
Yes,
RE: no motor controller - seandepagnier - 2022-01-21
maybe show a picture of it?
There are several reasons why it may not work.
RE: no motor controller - SYWindveer - 2022-01-21
I am using one of these wired directly to the Arduino on the motor controller
![[Image: logic-level-converter-bidirektionales-mo...28x228.jpg]](https://satkit.nl/image/cache/catalog/products/logic-level-converter-bidirektionales-modul-5v-auf-3-3v-4-fach-arduino-arduino-6536-228x228.jpg)
It has 4 channels like this:
I wired pin 8 and 10 on the Pypilot HAT PI header directly to the level shifter and this works fine.
Then I added the 2K4 resistor in series and it no longer works
Reduced the resistor to 1K , and it still does not work.
It would be nice to have optical isolation on the UART interface.
Too bad I can't find any of those 'digital " optos in my country.
I have some 6n138 in my parts bin, I'll try if I can make that work.
RE: no motor controller - seandepagnier - 2022-01-22
can you just run without the 2k4 resistor?
RE: no motor controller - SYWindveer - 2022-01-22
That is what i did, it works
I would have been nice to have an isolated UART interface though.
RE: no motor controller - hans-martijn - 2022-01-24
(2022-01-22, 05:09 PM)SYWindveer Wrote: That is what i did, it works
I would have been nice to have an isolated UART interface though.
Heb je bij reichelt.nl gezocht? Daar kan ik over het algemeen de electronica vinden die ik zoek...
Hartelijke groet,
Hans