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+--- Thread: Powering a DS18b20 (/showthread.php?tid=8577)
Powering a DS18b20 - Onepointbrewing - 09-23-2025
Hello
Is it possible to power (VCC) from a GPIO output? I need to be able to reset a DS18B20 by turning off the VCC to the sensor as they get out of timing sync often and only are able to re-sync from a power cycle - not from a node reset.
Whats the max current the GPIO as an output that ic an supply
RE: Powering a DS18b20 - admin - 09-23-2025
GPIO can't use as a power supply VCC.
RE: Powering a DS18b20 - neveridea - 10-04-2025
A safer approach is to use a P-channel MOSFET or an N-MOSFET low-side switch to control the sensor’s VCC, or even a small transistor. This way, your GPIO just controls the gate/base and the sensor gets proper power for resets.