Hi All, This is my first post here.I=92m LT LOO from Malaysia, lately I'm on volunteer list to help some engineering vocational school student with their annual school project. With limited of money in hand we decided to scratch build a DRO base on nick Muller design to be fitted to my X2 mill as a exhibition project. And with it some other student can built and machine some parts from it with the aid of DRO to be use as their class exhibition object.
Currently sponcering all of components/scale used in it building and at the end of the day I=92ll will be keeping the DRO and reimburse the money student spend on other parts they used in the project.
In the process student learn the following process in engineering skill
1.) Design and fabricating of PCB with the aid of CAD.2.) Electronics in enhancing mechanical machinery.( initially I though a CNC conversion would be even batter but lack of fund/skill and availability of cheap ball screw dampen the idea.)
3) embedded technology in today electronic.4) Basic skill of machining.
We had scratch build your design base on info nick publish on his web page.
After finishing building the board (DRO int4) and scratch building of buffered STK200/300 programmer and iron some other problem with ponyprog/ twinAVR software, we=92re able to re-program the ATtiny2313-
20PU chip with out much problem.All voltage at various test point was checked to be o.k. The next step was to test board to pc serial communication.
Booting up the old P3 900mHZ PC with dos6.22 startup disk in drive A. Run term.exe, pc echo UART to be 16550.
By power up the DROint4 board, the massage *** Welcome to yadro- land*** appeared.
No further response from here after, only a blinking cursor.
I have done the following in troubleshooting on the problem
- Loop back test on com1. Term console echo back the keystroke, no problem with com port run at 19200 8 N 1 I presume!
- A simple =93hello world=94 program was burn to ATtiny2313 to checked for error in process while burning. Led flash as it should.
It also a good time to be familiarize with ponyprog/TwinAVR at this time with erase, verify, fuses function at this time of cause not the LOCK bits and others that lock out chip from further ISP programming.
- The two opto isolator OK1,OK2 was swap so be sure that both TX,RX would work. Term console still show welcome massage.
Circuit board was check and re-check I could not find any error apart from a few that I found and correct before this.
I have tried to subscribe to nick's newsletter to enhance my knowledge but had no feedback from his side.
Not sure this is the correct place to post question on electronics but no much of info I could find from the web.
Your input on this problem will be much appreciated.
Regards,
LT LOO
Malaysia