-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I may wind up using USB or a serial port (those parallel port pins seem to disappear pretty quick!), but I'd like to keep a single connection to the computer if I can.
On 8/30/2012 3:04 AM, Lars Segerlund wrote: > Why do you not hang them on USB ? > > Something like a FTDI breakout and then SPI .... if you can find > working examples it's a nice solution, you dont gett the speed of > the parport BUT for temperature there usually is some lag. > > You could also run an 8 bit micro on a serial line :-D ..... it > has AD's .... and DA's .... just a thought. > > / regards, Lars Segerlund. > > 2012/8/30 Charles Steinkuehler <[email protected]>: Now I've > got LinuxCNC (both RTAI and PREEMPT_RT) connected to my 3D printer > and moving around the X/Y/Z/A(E) axis, I need to get some > temperature control wired up. I would like to just hang a few > ADCs off of some parallel port pins programmed to function as an > I2C bus. > > So...has anyone implemented a serial expansion protocol such as I2C > or SPI via the parallel port for LinuxCNC? > > It's pretty easy to bit-bang these protocols, but the code would > have to gracefully co-exist with software stepgen. Throughput > wouldn't really matter much, as the thermal time constants are > pretty long so even a few samples/s would probably enable a working > PID loop. - -- Charles Steinkuehler [email protected] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlA/TUIACgkQLywbqEHdNFz/EQCgpuas8SdMewj445089COwqQPS JbIAn2Z9JPWYyDckQrcmxxykS9ZwZX4t =FhLj -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
