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Topic: Solution for the 5V vs 3.3V problem (Read 14680 times) previous topic - next topic

Graynomad

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I don't think I can use these

Probably not, I can't see that they are linear.

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I'm not sure if I should just use a voltage divider because I'm concerned with accuracy to a certain degree.

A voltage divider is the easiest and probably the best way to do this. I see no reason to think there would be accuracy problems if you use good resistors.

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Rob
Rob Gray aka the GRAYnomad www.robgray.com

bobcousins

Just for interest, here is a board I am working on to interface Due to a 3D printer controller (RAMPS)

http://reprap.org/wiki/File:RAMPS-RIB-Back.jpg
http://reprap.org/wiki/File:RAMPS-RIB-Assembly.jpg

It is application specific, I am using TXS0108 to adapt some signals, with some gate drivers for MOSFETS.

I had trouble finding connectors with the same height, but they seem to connect ok.

Source files on github https://github.com/bobc/bobc_hardware/tree/master/RAMPS-FD
Please don't PM me asking for help. Ask questions in the forum.

Graynomad

Thanks for that Bob, looks interesting.

FWIW I think I've found a way to do this with very good compatibility for all/most shields.

BTW, nice Due pinout diagram you have there :)

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Rob
Rob Gray aka the GRAYnomad www.robgray.com

JChrispy58

Looks like i'm using a voltage divider....Thanks Rob for your help.

Louis90

Hello, read through those comments and is amaze with it. But i still got doubt. Please help me. Im so wan the 12 bit PWM provided by the I/O pins from this arduino due. But my concern are:
1. whether those logic level converter IC  can work this 12 bits PWM? because im doing with hall sensor geared motor, worry that the accuracy will be affected.
2. is those bi-directional converter? means if i attach all the digital pins to the converter, can i read/write data as other arduino board?
3. can those work with analog pins?

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