@JayKominek @kapelli @scherbakov.al @aleath @vagfilm
I've been frustrated by the ongoing parts shortage of ST, which I though was easing since I was able to purchase a Nucleo board recently as I reported in https://pianoclack.com/forum/d/674-build-your-own-hybrid-piano-step-five-the-firmware so I looked around for alternatives.
I've found that Microchip (actual brand name if you are not familiar with them) are more easily available, and even the lower tier of ST are. Problem is, they don't have good enough (or numerous enough) ADC.
As such, I'm now thinking of using an external ADC instead. Since I can, this has the benefit of being possibly much higher resoluton and much higher frequency. For example the MCP3914 is 24bits 8-channel simultaneous sampling at 125kS/s and 3 of them (on paper) will simply blow the socks off the STM32H743 which I am currently planning to use following Jay's footsteps. The price is very reasonable (less than $1 per channel), and using them would allow one to use almost any available MCU rather than being forced to wait for the unavailable ones.
Questions for all of you:
- has anybody already experimented with these (or similar) ADCs?
- any obvious pitfall which I am not seeing? Obviously 8-channel at 125kS/s each is a lot of data to pass via the SPI and to churn by the MCU, but anything besides that?
If not, I guess that's my next step.