|
Post by casper on Dec 27, 2017 14:28:35 GMT -8
Hi, So I've got gameduino2 (and as of today 3 too) and am wondering, having looked at excamera.com/sphinx/gameduino2/ and excamera.com/sphinx/gameduino3/index.htmlBoth say that gameduino 2/3 uses "5V pwr Main supply: 5-7V" and the unofficial gameduino 2 pin out diagram shows 5v and Vin, and doesn't say 'Unused' for the Vin. Generally, the arduino boards allow you to power them with a dc input (Vin) with 6v to 14v (from memory) and then regulate this down to 5v and it is generally accepted that +/- 5% is OK, so does this mean that the GD2/3 is powered from the 5V line (in which case why specify 5-7v) or Vin ? I've looked at the schematic for the GD2 (but can't find schematics/layouts download for the GD3) and it looks like it is powered from 5v pin but just wanting to understand why it says "For power, the shield needs 5-7v at 200ma on the 5V input; it has on-board regulation." as surely if you had 7v on the 5v pin of an arduino, it's a bit high, whereas if it is saying that actually the power comes from Vin but you can only power the arduino board with 5 to 7v that would be something to highlight ? Sorry if it is explained somewhere else but I didn't find it. Thanks.
|
|
|
Post by MangyDog on Feb 25, 2018 4:26:31 GMT -8
In my opinion. (ie. I could be totally wrong not having the schematic and datasheets in front of me)
The reason it says 5-7v is because the gd is vreging down to 3.3v and the little vreg wants to have a smaller range to keep heat down.
In fact there's 2 vregs one for the eve chip and stuff... And one for the little audio amp. The audio amp reg is tiny so really wants very little voltage overhead to keep cool.
|
|