Mini Datalogger Project

[punkture]

well after some quick thoughts, i'm aiming for temp, rpm and Manifold pressure, to be outputted to lcd screen, now for boost, can i read the voltage from the fuel cut vsv? if so, itd be the formula:

Mp=V^1.6 as i know 13psi is roughly 5v, thus x=ln(13)/ln(5)=1.6. but what about temp..im thinking use the bgb to find a relation.

question for u processer fiends is can i program the picaxe to compute with basic c? e.g output the temp using that formula?

[RT40Corona4AGTE]

you mean "basic" C as in simple C or as in the language called BASIC? The answer is of course yes to both, but there are different approaches for each one. Look at the motorola MPX sensors for manifold pressure measurement mate, they are pretty good, and are easily read through an ADC. All you would need to do would be to run a vac line to your datalogger.

If you need a hand, I can recommend some stuff to you for doing this, might even be able to provide you with some software too.

You would also read in rpm using interrupts, but I am sure you were aware of that.

[punkture]

you mean "basic" C as in simple C or as in the language called BASIC? The answer is of course yes to both, but there are different approaches for each one. Look at the motorola MPX sensors for manifold pressure measurement mate, they are pretty good, and are easily read through an ADC. All you would need to do would be to run a vac line to your datalogger.

If you need a hand, I can recommend some stuff to you for doing this, might even be able to provide you with some software too.

You would also read in rpm using interrupts, but I am sure you were aware of that.

okay, sounds good mate, like i said before, i'm only capable of programming pic's using inputs. this includes setting them up though. so using interrupts is interrupting the line voltage yes? and it would count the number of these?

if i wanted to get started with a logger displaying the rpm, temp (from coolant) and manifold pressure, what do i start with? thanks (and sorry takai for thread jacking)

[MWP]

Hrm, sounds like youve got a bit to learn
You need to look up how interrupts/timers work on your uC.
Probably a better idea to take this discussion over to a PICAXE dedicated forum.

[punkture]

yeah, im mucking around with my 16f677 pic atm, my elec eng mate is teaching me the ropes with a tacho circuit to start off with, its almost done, then im gonna input that to picaxe, then to lcd

[OnAll-FOUR]

One day when I get off my but I plan to interpret the serial data stream from my wolf v550 ECU and make a text LCD display.

I have and old AVR32 evaluation board at home I have been playing with and I have decoded the wolf V500 data stream as well. Just need to program the decoding and display in to the AVR32.

MWP did you work with crystalfontz at all?? I want to try get my hands on one of their nice displays

It also has a SD card slot on the evaluation board so it would be handy to save it all there as well

[takai]

Hehe, yeah it does sound like you have a little bit to learn. Fine to have a hijack.

For my project this little baby arrived yesterday:


Its a MicroSD shield for the Arduino. Which is one of the nice things about developing on the Arduino, as people have developed shields like this one which cost a couple of dollars more than the individual components and make my life much easier.

Now i have it logging to the card, and writing to the LCD at the same time. The only problem is that 95% of the time when i turn it off i corrupt the SD card because i dont have any way of telling the device to stop logging. So thats the next thing on the agenda, hooking up my 3way accelerometer and buttons so i can start and stop it logging.

[OnAll-FOUR]

love it

[RT40Corona4AGTE]

great stuff!

[MWP]

MWP did you work with crystalfontz at all?? I want to try get my hands on one of their nice displays
It also has a SD card slot on the evaluation board so it would be handy to save it all there as well

I work for Crystalfontz
I have nearly all the CF LCD, OLED & Eval boards here.

None of the eval boards are really suited to a perm car installation unfortunately
Its a shame since they are really easy to develop on with the bootloader & sd card interfaces.

CF are close to releasing a new module though that might be very nice for custom car gauges, etc.
Its the same as the CFA635 module, but with a graphical (mono) display, powerful ARM uC and microSD slot.
Im not sure how much CF will be opening up the uC to custom programming yet though.

[punkture]

sorry to interrupt lol, i've sussed out on net but no luck so far, im using a 128x64 LCD display (HG12602NG) ive setup the picaxe chipset (20m) but was wondering on the lcd pin outs, what do i input the CS1,CS2, RS. and also the RS pinout decides wether its displaying ram or instructional data, how do i do this through picaxe? ive sussed the forums but no luck yet

edit: i have grounded the R/W to free up pins, i am using a pin for RS and E, but this only leaves me with 6 output pins left, (pic side) and 8 pins needed (D0-D7) on lcd, plus theres those CS1-2 etc as well?

[takai]

Now its pretty much done


Using the Wii nunchuck for the 3 way accelerometer it has in its guts. SD card is writing to file regularly, and GPS is sending all the data needed. On the screen you can see the unparsed GMT time and accelerometer values, plus a ticker in the bottom corner. I need to do some more code optimisation and then ill release the code.

Im currently waiting on a 20x4 LCD to upgrade the display with, and then ill think about packaging it all into a nicer package so it can be used in car.

[MWP]

Nice work
Programmed in C i hope?

[takai]

Sortof, Arduino has its own C-like language.

[OnAll-FOUR]

What does the Wii interface use?