Ethernet Shield from nuelectronics
#1
Posted 20 August 2010 - 05:53 PM
#2
Posted 20 August 2010 - 07:45 PM
#3
Posted 20 August 2010 - 08:12 PM
That's odd that the joystick wouldn't work.
It appears that the board is driving 5V to the joystick for analog input--and the schematic's quote of 3.3V/5V compatiblity is for the "logic I/O" (screen, etc.) only.
Can you move the VCC for the joystick to the 3.3V pin easily? Do they have a board with a joystick ADC at 3.3V?
Chris
#4
Posted 20 August 2010 - 08:33 PM
It appears that the board is driving 5V to the joystick for analog input--and the schematic's quote of 3.3V/5V compatiblity is for the "logic I/O" (screen, etc.) only.
Can you move the VCC for the joystick to the 3.3V pin easily? Do they have a board with a joystick ADC at 3.3V?
Chris
Thanks,
No on both questions. But I can replicate the same schema outside the shield with another analogue pin.
What about enc28j60 ? what's your advice,
/pascal
#5
Posted 20 August 2010 - 08:43 PM
That's odd that the joystick wouldn't work. Right on the schematic at
http://www.nuelectro...ia_3310_lcd.pdf
it says
"VCC - 3.3V - 5V
All ligic I/O compatible with
5V & 3.3V logic level"
The joystick use 5v and voltage divider using resistances (a solution to not use one pin per direction). So, in fact, I can use some of direction (like up/down ..) but not all. Just because the voltage on AD0 is more than 3.3v in some situation. Without pushing any direction, AD0 return 1023 and also when I push right direction. The most important is, without any push, the AD0 is connected to 5v with a 2K resistance. Is it risky ?
/pascal
#6
Posted 20 August 2010 - 10:55 PM
What about enc28j60 ? what's your advice,
We're working on Ethernet drivers for the Netduino. You're welcome to build something using the source and lwIP if you're into C++ coding, but we hope to have an official Ethernet solution sometime in the near future as well.
enc28j60 is a very attractive shield option since drivers seem to exist for it in .NET MF already...
As far as putting 5V into the analog pins... The Atmel datasheet says not to do it. So we'll officially say not to do it as well. Especially on AD4/AD5.
Chris
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