Discrepancy between schematic and the documentation. Which is correct?
Version 2 of the myFocuser Project
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Hi Robert, sorry to bug again, but I've been trying to figure out why I'm delivering very little power to the VIN pin for the Arduino board, and in the process of rereading everything, I've stumbled across a discrepancy that might be related?
In the schematic is shows that C1 should use the 0.1uF capacitor, but in the documentation it shows it as 0.33uF. Vise versa for C2. I followed the schematic, but which one is correct?
the schematic is correct. the one above on the left disregard
Vin should be around
12v input - Vdrop1N5408 - Vdrop7808 - Vdrop HER208
12 - 1.2 = 10.8v to 7808
7808 requires at least 9V to work
Output of 7808 is 8v
so Vin = 8v-1.2 = 6.8V
For the onboard chip regulator to work for Vin, it must be at least +1V or more above 5V usb.
Else the nano will draw power from usb.
If Nano is not connected via USB then Vin powers the board
Last edit: brownrb 2021-03-14
Ok, cool. I'll check that off the list then. The debugging continues.
Thanks for the support so far. Always super responsive!
I've learned a ton working through this project so far, but still a bunch
more to work into my brain.
Scott
On Sat, Mar 13, 2021 at 10:42 PM brownrb brownrb@users.sourceforge.net
wrote: