Dual port RAM not really needed, Arduino can only read or only write at 1 time.
i think one of these would be a good ram for this project, but i dont really know... im gonna have to do research on them and on ram chips... i heavent really used them before. maybe you could introduce me or give some links to where i could read about them?https://www1.elfa.se/data1/wwwroot/assets/datasheets/fm24c64b_eng_ds.pdfhttps://www1.elfa.se/data1/wwwroot/assets/datasheets/zsLyontek_SRAM-LY6264_EN.pdf
Have a look at the MCP3201 and MCP4921.
Although once we get to the $12 mark, it's probably easier to just get one of these:http://ruggedcircuits.com/html/megaram.html
Wow, they are like 30 bucks each on average.I used some dual port RAM several years back and expected them to be around the 5 or 10 buck mark by now.I like the idea of rolling your own.EDIT:Found some as low as 4 bucks at Future Electronicshttp://www.futureelectronics.com/en/Search.aspx?dsNav=Ntk:PlainTextSearch|dual+port|3|,Ny:True,Nea:True,N:749Here is one at 12 bucks which is 8K X 8 which would give the OP about 1 sec worth of sampling (as he original asked for) at a rate of 8KHz.http://www.futureelectronics.com/en/technologies/semiconductors/memory/dual-ports/Pages/7016166-CY7C144E-55JXC.aspx?IM=0
can you please explain exactly how to calculate that?
Quotecan you please explain exactly how to calculate that?8K of memory at a sample rate of 8K per second gives a time of 1 second. Kindergarten maths.say you had 16K of memory and filled it at 8K per second how long would it take you? ( 2 seconds ).In fact for what you want it is more like a quarter of a second for the effect you are after.