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Pull Up resistor

658 Views - Created 31/03/2018

31/03/2018

Posted by:
przemek.zambrzycki

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Hello,

I have just received this board and after 15 years from last soldering it took one hour to make it operational :)

I need to migrate a strange topology of 33 ds1820 sensors connected in two stars. I'm using raspberry and on 3.3V topology I ahve two pull up resistors. Now I need to migrate to Banana and add another 10 sensors in two busses.

Good thing is 5V powering, but do I need the pull up resistors as the board should measure the impedance so the resistors in my opinion are not needed any more.

Am I right?

 

Thank you

01/04/2018

Posted by:
andrew

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Location:
United Kingdom

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Hello

You should not need the pull-up resistors, but the best thing to do is try connecting all of the sensors to the board without the resistors and then if you have trouble reading from any of the sensors try adding a pull-up resistor to see if that fixes the problem. 

AB Electronics UK Tech Support

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