DIYEFI.org Forum

Must looks at that sourceboost thing more closely, looks pretty promising at the first glance, I'm already crapping my pants thinking about doing unit conversions with assembler.... not to mention the possible menu system using the ASCII display and a 5-way joystick. The call routines are excessive,...

Alright, did some more research, first my assumption that commands run at oscillator pace was plain wrong - they run at 1/4 of the oscillator frequency. Funny how you never pay attention to these things during the class and other time-insensitive applications (Our PIC project at the college was a st...

I have nothing other than experience which sets off the red flags .. we'll talk again once you post some real life code then. You're right, I can't comment on how/why until I see some failing code ... but then why did you post your code in the first place other than for comment ? I am and I did, bu...

I am curious to know why you think this code shouldn't be run in an interrupt handler? The "wait" isn't an actual instruction code, it's an indication to put a few idle cycles to allow the signals to propagate in the external IC's, the PIC will be running at 40 MHz and the A6832 has output...

I realized there's a secondary Xtal driver built in the PIC µC, so I don't need external circuitry, just the 32.768kHz crystal and some capacitors. Anyway, the idea was to use the timer rollover interrupt to time the display write sequence, but the 32k oscillator is so slow I need to preset the tim...

http://koti.mbnet.fi/~vendigo/DD/th_logic.png Here's the logic updated; the RTC clock signal is supplied to T1OSI pin for accurate time base and alternative clock for low-power operations. RPM and speed signal are fed into the capture/compare pins. http://koti.mbnet.fi/~vendigo/DD/th_inputs.png The...

Hmm... yeah, the system is excessive. Still a good workaround if you need more frequency counters than the system has capture modules :D It takes so much PCB estate I think I'll scrap that idea and go with the capture modules indeed. Fortunately, PIC18f458 has two CCP modules, normal and enhanced; h...

(I updated the first post concerningn the engine speed input, check it out if you missed it!) And now for the visible results of the hard work, the actual gauge panel! I planned so there would be two panels with large displays, two panels with small displays, and a readout panel for the rest of the ...

Right. Got the decoder/base board for the displays figured out. http://koti.mbnet.fi/~vendigo/DD/th_decoder.png First, the configuration pins. The display boards have five addressable display elements; to make use of them, they need to be tied with data pins on the bus. Referring to connection pin l...

I'm in the same boat, certainly interesting stuff. Some quick thoughts, have you see clear plexy when the back is painted black. Typicaly that comes out quite nice, and works for a nice finish on a budget. I'm also curious if you plan to do this up in modules, such taht if someone wanted to make ju...