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  • sisal1 commented on mosvath's instructable Temperature with DS18B203 years ago
    Temperature with DS18B20

    In parasitic mode, you need to connect VDD to Ground. Additionally, you may need to replace the resistor as with 4.7kΩ the sensor may not get enough power to run at all.On a 10 meter cable run with parasitic power, I get reliable results when resistor is less than 2kΩ. With 4.7kΩ, I got over 95% read fails. With 2.3kΩ I got around 18% fails. With 1.9kΩ I get 1.7% fails.

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