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Topic: Correct board for 747 Audio Control Panel (Read 1 time) previous topic - next topic

fc747

Hi Folks, first post..

I'm looking for a card that for the Audio Control Panel in my sim - the box has:

13 pots - std 10k rotary
36 digital in - switches
33 digital out (led's)

What card do you recommend for this? In order to reduce wire harnesses, I would like the card to be onboard the box, with just pwr and usb out -

Thanks in advance!

Farrokh.

CrossRoads

82 IO?
Check the Mega, see if that has enough.
Otherwise, will need to add some multiplexing.

You  have current limit resistors mounted with the LEDs?
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

fc747

Hi -

Check the Mega, see if that has enough. -

looks like, 13 pots ok, but may run some short on the digital in/out - can omit a few channels if needed



You  have current limit resistors mounted with the LEDs?


no, but can be added to match outputs - free to use any led type as i haven't started building the box yet.. can work backwards from the card...

thanks!




CrossRoads

You can use the analog pins as digital also if you haven't done so already.
Another option is to mount an '2560 processor on a standalone board - I posted a link to Schmart boards for one yesterday - and get access to all the IO that is available - might be enough that way; am not sure how many of the 100 pins are tied up for power, ground, xtals, etc.  Looks like 11 pins are VCC/GND/Aref, 2 for Crystal, so 87 available IO lines?
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

fc747

Thanks CrossRoads - I don't own a card as yet, was researching the best one for this app.... will read thru the docs some more...

The ATmega2560 is listed max i/o of 86....  so should work -

cheers,

CrossRoads

I ordered a couple of 2560's from Digikey, and a couple of the Schmartboard 100 pin 0.5mm QFP boards.
Gonna add a 10K resistor, 16 MHz xtal, 22 pf caps, and 100nF caps, some 0.025" square pins for an ISP and Serial programming interface, have a standalone Mega2560!
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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