August 7
2014
K40 Moshi V4.7 Board trace out
I was interested in how the board in my new K40 laser cutter was laid out and functioned.
A mystery chip is always a puzzle that can be fun to crack :)
Very simple design. Although they could have used more of the error checking on the CH314A. Best discovery is the possibility of there being a uart port to exploit :D Sadly all but 1 of the pins on the mystery chip are used and nothing traces out to anything useable for extra end stop switches.
The main processor looks like an AT89S51 ( Modern version of the 8051)
Very interesting info, I only miss one of the direction pins to be able to remove the processor and adapt an Arduino Pro micro with GRBL (a new brain for less than $2!!).
This other pinout makes more sense http://www.buildlog.net/forum/viewtopic.php?f=16&t=909