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  • Simply the best!

    posted by robel on 11/28/2012
    4

    Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month

    Pros:

    The DS18B20 is a digital temperature sensor with a great accuracy. I have two of these and they agree within one sixth of a degree. The price here at DX is one of the lowest I’ve seen, unless you order bulk (thousands) quantities. Using 1-wire is pretty simple on the Arduino, and with this well known communication protocol, this sensor can be used with other MCUs as well as a PC.

    Cons:

    None at all! It works as expected.

    OtherThoughts:

    Working with 1-wire requires a 4k7 ohm pull-up resistor according to the data sheet. This is true whether you use parasite power or external power (3 wires). The 4k7 value is not critical, but it is a well known resistor (part of the E12 series for example). Any value around 4k7 ohm should work. I would not go too low however because that would make job hard for the master when pulling line low. Going to high for a pull-up resistor could provide too low power to the sensor and make the 1-wire more sensitive to noise.

    Bottomline:

    This is a really cheap and great temperature sensor with an excellent accuracy. Several sensors can be connected to the 1-wire bus. Easy to use and an “extreme deal”. :-)

    • DS18B20 in ds18b20 parasitic power mode

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