Electronics > Projects, Designs, and Technical Stuff
How to Power DS18B20 Over Long Distance
bostonman:
What is the best way to get low voltage over long distances to power a one-wire DS18B20?
I could use higher voltage AC, but then I need circuitry to reduce the voltage to DC.
ledtester:
What kind of distance are you attempting to communicate over?
This discussion has some ideas:
https://forum.arduino.cc/index.php?topic=21762.0
And it mentions this Maxim app note (#148):
https://www.maximintegrated.com/en/app-notes/index.mvp/id/148
A solution for up to 200m is outlined in Appendix A.
oPossum:
Power is easy because 1 wire devices are usually very low power. The hard part is reliable communication. Open collector buses are not well suited for long distance.
bostonman:
--- Quote ---What kind of distance are you attempting to communicate over?
--- End quote ---
Probably 50'.
It may be a question of the best way to just get 5V DC over long distances rather than focus on a specific device.
Does one just increase the DC voltage at the beginning to get 5V at the end? If so, then what if you're powering one device 1' away and another 50' away?
ledtester:
--- Quote from: bostonman on July 30, 2019, 02:12:50 pm ---It may be a question of the best way to just get 5V DC over long distances rather than focus on a specific device.
--- End quote ---
How much power do you need to deliver?
You can use the "AC power line" trick to reduce the voltage drop due to wire resistance with DC by using a DC-DC buck-converter at the device -- that's how power over ethernet works.
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