Powering SM5100 with ND+
#1
Posted 20 October 2011 - 11:46 AM
#2
Posted 20 October 2011 - 03:34 PM
-- H.L. Mencken, "What I Believe"
#3
Posted 20 October 2011 - 06:00 PM
#4
Posted 20 October 2011 - 08:10 PM
The Vin pin on the shield goes to a voltage regulator, that outputs ~3.8V, while the 5V and 3.3V pins are not connected on the shield. So you *have* to power it via vin. It's a low-drop regulator, so it's normal that it works with 5V (as Vin would be 5V also when the (net/ar)duino are powered via usb. However, it should also work fine if you connect +9V to it ...
Thank you for the explanation.
http://www.sparkfun.... shield-v12.pdf shows you which pins are connected (top right of the schematics).
Cool. I found out that I needed to connect rx/tx to pins 2 and 3 by trying, as I didnt understand this schematic. I don't have any jumpers on the board that I could move around... and I didn't really understand the UART positioning. Can you explain the UART part to me please, so I can understand it (hopefully) in the future schematics? Thanks.
Edit: on second thought, while reexamining the schematic and the breakout board, I guess the jumpers are "things" that looke like small SMD stuff near D pins? And by removing solder and applying it differently, I can change which RX/TX is the real RX/TX... Not important for me really, but I think I understand. It is just that I expected a jumper to be similar to a jumper seen in 286 and 386 computers, where you had pins sticking out, and you put this plastic cap on top of two pins... ) (
Re: Mario: I know, but I figured this part is probably the same, and since ND forum is a bit more frequent that ND+ forum, I hoped to get a faster answer here . Thanks for the heads up, though.
Regards,
Miha.
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