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Voltages for connecting ds18b20 to Edison breakout board

Discussion in 'General Electronics Discussion' started by yamadanao, Jun 21, 2017.

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  1. yamadanao


    Jun 21, 2017
    It appears that the upm library provides support for reading temperatures from a ds18b20 on an Edison via uart. They also provide this hookup diagram. However, it looks like the ds18b20 can only operate at 5V while the UART TX and RX on the breakout board are at 1.8V (table 28). This upm diagram seems to suggest they should be directly connected though. I am hesitant to try it for fear of damaging the board or module. Then how to test ds18b20?

    Do I need to step the voltage up and down between the Edison uart and a 1-Wire bus?

    If so, what would be the appropriate way to do that?
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    The DS18B20 datasheet states an operating voltage from 3 V ... 5 V.
    So even when operating the sensor from 3.3 V you'll need a level translator, e.g. this one or this one.
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