pic oscilloscope

[fugrammer]

hi! i am trying to make an oscilloscope with my pic. I want to use it to measure short signals (about 0.1ms - 2ms). however. i don't know can i suppose to show it long enough. The signals could be irregular. If i set the time/div to be long, the signal would appear almost a line, if i set the time/div to be short, the signal would be too fast to be seen.

please help!

 

[Nigel Goodwin]

You need to syncronise it, just like a real scope - wait for the event to occur, and then record and store it.

 

[picbits]

Use the CCP on the PIC, when it triggers a CCP interrupt, output the value via the RS232 port.

The PC can do the rest of the timings etc

 

[mister_e]

I thought this one is impressive for what it do and what's under the hood...
A poorman's oscilloscope

 

[fugrammer]

thanks for the replies. however, the question that troubles me is like, how do i show a non-periodic RF signal on a oscillscope. wouldn't the time/div has to be set longer? but the signal will appear to cramp together won't it?