Home     Contact     Forum     Projects     Experiments     Circuits     Theory     BLOG     PIC Tutorials     Time for Science     RSS     Terms of services     Privacy policy  
   
 Home     Forum     Projects     Experiments     Circuits     Theory     BLOG     PIC Tutorials     Time for Science   

Author Topic: repair a small cetrifuge  (Read 1948 times)

0 Members and 1 Guest are viewing this topic.

modchip11

  • Cadet
  • Posts: 1
repair a small cetrifuge
« on: June 01, 2014, 01:54:12 AM »
hi pcbheaven user

the  centrifuge  use 2 boards ;

*one power board
-based on pic 16c72a
- make the phase control for universal motor
- read the speed by tacho
- oppen door by bobine
- make the brake

* second display board
-based on pic16c57c
- display the speed in two 7 segment
- display running time in two 7 segement
- display the door status by the (a,b,g,f) segement from one desplay ( _ door closed , |_ door oppened)
- read the 8 buttons
     * butto, up and down for time and speed setting   (4 button )
     * button start to start motor
     * button stop to stop motor
     * button LID to open the door
     * button continue fonction ( i donot use it )


the problem that this centrefuge have always the 16f72a vcc and gnd short-circuit
my custemer ask for board repair i try the cpying prog but the two pic's are code protected

So i try the reverse ingeniring
i got the display of speed and the time and the 4 button for setting time and speed    (for the display board )

i got also the motor speed control and i think it is easy to read the speed from tacho

i do all the two board by changing the pic's by the 16f876a

but i m stuck on the way that make the communication for the two board

any one can help they made this connection on the picture
thank s in advance 

     
 


cheerio

  • Sr. Member
  • ****
  • Posts: 306
Re: repair a small cetrifuge
« Reply #1 on: June 03, 2014, 22:31:29 PM »
not sure but it might be a software driven i2c. hook up a logic analyzer and post the output.