I realise this may be a silly question but why was a 16Mhz clock shosen over a 20Mhz clock? I have built a protorype unit and unfortunalty in New Zealand can only seem to get 20Mhz xtals and resonators. Are there any alterations required in order to run the code on a pit opperating at 20Mhz?
I have just had a really stange fault. I built a couple of Linistep drivers and they were working really well. However i decided to see if i could get things running at 24V and again all went well for a while but then I found a little problem. One of the transistors was not seated as well as it should have been and heated up melting the insulator.|Delete 'P-' before: '' but after: 'andrew@borg.co.nz
The fault i am getting is that in Mach3 the motor only steps once if i jog forward and backward several times.
I replaced all Caps, Transistors, the PIC and even the xtal just because.
However the problem persists. Its almost as if the PIC is not running (the new, old or other unit) I also tried a diferent computer just in case there was an issue with the paralell port but I still have the same issue.
Unfortunalty i do not have a scope so can not see what is going on.
Any sugestions would be appreciated
I have just had a really stange fault. I built a couple of Linistep drivers and they were working really well. However i decided to see if i could get things running at 24V and again all went well for a while but then I found a little problem. One of the transistors was not seated as well as it should have been and heated up melting the insulator.James Newton of Massmind replies: It's quite possible that the PCB was damaged by the heat or excessive current as the driver melted down. Check the PIC power supply, and the traces from the xtal or any other critical pins (MCLR, etc...)
The fault i am getting is that in Mach3 the motor only steps once if i jog forward and backward several times.
I replaced all Caps, Transistors, the PIC and even the xtal just because.
However the problem persists. Its almost as if the PIC is not running (the new, old or other unit) I also tried a diferent computer just in case there was an issue with the paralell port but I still have the same issue.
Unfortunalty i do not have a scope so can not see what is going on.
Any sugestions would be appreciated
ON 20090831@4:02:41 PM at page: On a web page you were interested in at: http://www.piclist.com/io/stepper/linistep/index.htm#40054.4718865741 James Newton[JMN-EFP-786] removed post 40054.4718865741 |Delete 'k-carl@hotmail.com asks:
I just wrote you cursing my stupidity: I suspect that when I jumped the direction pin with 12 volts I fried the PIC, then I requested a replacement chip - now I read that -let me quote, 'v.1 seems to work OK, a few minor things need improving...touch up phase switching for direction'. I hotwired the pin to test my wiring/relay - is it possible that my relay was fine, that the (my) linistepper may be problematic with direction changing - this is critical because switching is imperative to my clockdrive's function!
I built two linisteppers kits and happily they both drove stepping motors - I was building a relay system for a telescope clock drive and I accidentally touched 12 volts to the direction pin (I wanted to test that feature) and I think I smoked the processor, maybe both of them (the boards were wired together). If I send you the Linisteppers can you check out the chips for me? I checked the zener diodes, etc. and they are OK. thanks, Carl'