[sdiy] Keyboard scanning rate

[Oren Leavitt]

Neil Johnson wrote:
> Hi,
> 
> Ullrich Peter wrote:
> 
>> In the Korg Poly800 I measured around 950Hz.
> 
> 
> Ok, so a little over 1ms plus a little slop per scan.
> 
> At 1ms scan time I can't play fast/hard enough to reach the maximum  
> velocity value so I may go with that for now, with the option of  going 
> up to double that rate.
> 
> I know there are a few people on the list who have designed and built  
> their own scanned digital keyboards, so I'm hoping for some differing  
> opinions.
> 
> Cheers,
> Neil
> -- 
> http://www.njohnson.co.uk
> 
> 


I built a CMOS based keyboard scanner some time back based on the ETI80 
design. It scans 61 keys at about 1kHz - it has worked perfectly.
- Oren