Enough pins?

[nyto4 0]

I'm new to this project so I'm not certain of the logistics. I need to use two ADC inputs and also would like to use an SD card to log to.

 

Is this a good setup for that?:

 

1. MSP-EXP430G2
2. http://store.43oh.com/index.php?route=product/product&product_id=102 on top of #1
3. http://store.43oh.com/index.php?route=product/product&product_id=66 on top of #2

 

Thanks.

[abecedarian 330]

Writing to SD will take a lot more time than reading ADC, and those will use different pins.

 

You should be okay.

[nyto4 0]

How fast can I realistically sample and log to the SD card? Thanks for your reply!

[bluehash 1,581]

How fast can I realistically sample and log to the SD card? Thanks for your reply!

No one has benchmarked it yet. What does your application do? Can you store your samples in a buffer and then write it to the card?

[nyto4 0]

I guess I'll benchmark it when I get the parts, then. It will just sample a signal on the ADC converter and log the result. Would like to sample up to 20kHz continuously. We'll give it a try, any suggestions would be helpful.

[jpnorair 340]

Just a note: It is probably best to log samples to RAM, and then batch write them to the SD card.  The 5-series parts have more RAM, and they also have DMA, so they would be better if you are really trying to blast ADC readings into the SD card.  A good CM0/CM3 with DMA-backed ADC and SPI will be able to run much harder still, maybe even 1MSps, but for 20kSps you can *definitely* achieve this with a 5-series, and even have plenty of CPU time available for other things should you need them.  

 

43Oh used to have a USB MSP430F5510 board that mated with booster-pack pinouts.  I would check if this is still available.  That would be my best bet.