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Re: AVR question
You can cut the total number of i/o pins by:
1) using serial lcd: they are most popular than the parallel ones, today
2) use analogic encoding for the 4*4 keyboard to have only one input pin occupied: you can find some app. note in the micr*chip website about that, i don't...
Small printers in POS are thermal or (less frequently) impact printers. All these have a serial interface, so no problem to drive it whit a microcontroller. If you want some unusual character set then you must deal whit a graphical-like printing using ASCII special characters to drive the...
pic y 75176
If you want to use the CAN bus then search the new stand-alone CAN controller MCP2515 from Microchip, that is a replacement of the old MCP2510 whit new features and all old errata fixed.
The easier, cheaper and faster way to do this at this speed is no-doubt a PIC16F84 whit a MAX232 and some passive components.
You can easily find a lot of pre-cooked code to solve your problem or somewhat of very similar.
Re: sinewave generator!
As i told, the Wien Bridge oscillator produce (ideally) an *absolutely* pure sine wave, whitout distorsion at all.
This is because the phisical principle of functioning of the circuit: the feedback network produce *big* phase-difference for *little* frequency difference...
PBPro is not at the level of PBPlus, for that concerne to reliability and "repetibility" of generated code.
Plus, PBPro have not a real useful management of arrays in memory, as i just writed in another post.
Bye
New Proton+ (former Picbasic Plus) is better in memory managing for large arrays than Picbasic Pro.
In some projects this is ultimate for choice.
For the rest the two are the same.
Bye
Re: CAN Bus
Apart the phisical CAN protocol you can find other resources searching for CANOPEN, one of the logic/application protocols based on CAN.
Bye
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