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Logic Machine Forum › LogicMachine eco-system › Hardware v
1-wire pullup resistor

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1-wire pullup resistor
Bitver Offline
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#1
08.10.2019, 10:56
Hi,
Do I need a pullup resistor for 1-wire temperature sensors ds18b20 connected to Re:actor?
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admin Offline
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#2
08.10.2019, 11:07
Are you powering it from 5V or using parasitic power? From datasheet: VDD must be grounded for operation in parasite power mode.
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Bitver Offline
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#3
08.10.2019, 11:49
(08.10.2019, 11:07)admin Wrote: Are you powering it from 5V or using parasitic power? From datasheet: VDD must be grounded for operation in parasite power mode.
 3 wires: +5v, GND, Data.
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admin Offline
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#4
08.10.2019, 12:05
Pull-up is not needed but you can get more reliable readings by adding a capacitor (at least 0.1uF) between +5V and GND as close as possible to the sensor.
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Bitver Offline
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#5
10.10.2019, 12:02
(08.10.2019, 12:05)admin Wrote: Pull-up is not needed but you can get more reliable readings by adding a capacitor (at least 0.1uF) between +5V and GND as close as possible to the sensor.

Thank you.
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