svejk
New Member
Posts: 14
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Post by svejk on Dec 24, 2020 18:43:08 GMT -8
I am using the Pi2Grover but missed the fact that it uses 5V for the WeatherRack. Documentation needs to be clearer on that point. I wish that Pi2Grover drove the WeatherRack with 3.3v off the GPIO because that's regulated and remains constant regardless of variations in system input voltage.
My voltage is currently 4.75v because of a long power supply run, but I have a plan to change the setup and get it back up to 5. Lower limit of the RPi is 4.7v, so I'm still in the operating range but close to the edge.
YW, Dave
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Post by SDL on Dec 28, 2020 18:04:37 GMT -8
Dave,
The 5V supply from the Pi2Grover board is also regulated and remains constant. Unless you have a really bad power supply! It almost sounds like you are running a long power supply wire. Is the 4.75V measured at the Pi?
Yes, the voltage drop along your wire (Assuming you are talking about what the voltage is at the end of the WeatherRack2 cable) is what is causing this problem. Yes, the lower limit of the Pi is 4.75V, so you are right at the edge.
BP
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svejk
New Member
Posts: 14
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Post by svejk on Jan 15, 2021 8:45:37 GMT -8
It is, indeed a long wire from the power supply to the Pi, and too low of a gauge I suspect. 4.75 is measured at the Pi. I plan to run a 120v cord to a weatherproof box near the pi which will shorten that run by 30ft.
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smurphy
Full Member
Posts: 169
Raspberry Pi: Yes
Other Device: many ...
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Post by smurphy on Jan 23, 2021 1:53:24 GMT -8
I wouldn't go with 120V outside. Reduce the voltage to 120AC/12V, and then in the weatherproof box, put another reducer from DC12/DC5. Just to make sure kids playing won't get a 120V discharge. In Europe, it would have been 230V which hurts a little more.
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