DIY_EFI Digest Wednesday, August 18 1999 Volume 04 : Number 475 In this issue: MCU recomendation? N82S2708N Signetics chip Bosch Contact for MAF meter See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Tue, 17 Aug 1999 14:50:24 -0700 (MST) From: d houlton x0710 Subject: MCU recomendation? Can someone who knows a bit more than I do about MCUs reccomend one and a development board to use? I'm new to this and I'm finding it near impossible to decide what chip/board I should be looking at. I'm learning as I go, but I don't even know enough where to start. I definitely want one that I can get a C compiler for. I think the Hitachi might be good as their dev. kits come with one (or two). Cost of course is an issue. The Hitachi boards start around $150 complete with C compiler, power supply, board, etc.. I figure I can afford up to $250. Maybe $300 if there's a strong case for that particular set-up. My application is a controller for a water injection system. I'll want to read input from items like a MAP and/or MAF sensors, rpm from the coil, duty cycle and pulse width from an injector. Maybe some others later on as well. I plan to use this as a learning experience to do bigger and more complex things so I want a system with some expansion potential. Some of the things I want to do is control (pulse) a solenoid for the water injection similar to how the progressive nitrous controllers do. And possibly controlling an additional fuel injector or two. Also, drive an LCD showing the duty cycle and pulse width. There are bazillions of chips just from Hitachi. Each slightly different as to what's on it. What features should I be looking for for this kind of work? I do want a Flash controller BTW just because they look easier to program/re-program. A/D converters? 8-bit? 10-bit? How many channels? Comparators? Are these used in place of an A/D converter? D/A? Even needed? Watchdog timers? I/O ? Bus? CAN, SCI, IrDA ? 8-bit? 16-bit? 32-bit? 64-bit? Speeds from 12 MHz to several hundred MHz How much speed and bandwidth is nice to have vs. rediculously too much for what I'm doing? I mean this could probably be done with a PIC. My app is a 4cyl with 6K redline, but I'd like it to work up to 8 cyl and 7K or 8K rpm. Rough memory estimate? 64K? 256K? Memory seems to go up with bus width and speed. I'd rather wait until I get a little bit more experience and understanding before trying to interface external memory chips. Knowing specs like resistance and amperage of my solenoid coils, how do I figure out if the MCU can control it directly or if I need external transistors to do it? I actually purchased an Atmel board over a year ago to do this before I was really ready with anything else, but now that I'm finally back to it, I really want to work with a C compilier instead of assembly. The software I'll figure out on my own as I go. I just need help selecting the right hardware to start with. Any help or advice is welcome. It's painfully obvious I think that I'm not a hardware guy. Even book references would be welcome although most of them are probably written like a college text book. Something like a "MCU's and Embedded Systems Programming for Dummy's" is what I need. thanks much, - --Dan houlster@xxx.com ------------------------------ Date: Tue, 17 Aug 1999 19:10:16 -0500 From: DC Smith Subject: N82S2708N Signetics chip On the part for our dead flight simulator: I just wanted to thank everyone that replied with help identifying the pinout for this chip. I ended up programming a 2716 to replace it and pulling the A10 and VPP lines high, so that it reads the upper $3FF of the 2716. Thanks again everyone! *********************************************************************** Dan Smith 84 Regal 12.03@xxx.45 GSCA# 1459 St.Charles, Missouri mailto:morepoweral@xxx.net http://www.tetranet.net/users/morepoweral *********************************************************************** ------------------------------ Date: Tue, 17 Aug 1999 21:12:49 -0400 From: bjanesi@xxx.com Subject: Bosch Contact for MAF meter Does anyone have a contact at Bosch, or just somebody who really knows how the Bosch Air Mass Meter (or MAF) works? I need to get a few simple questions answered ...simple for someone who really knows the details of how these things work. Thanks, Brad (brad.anesi@xxx.com) Several ass't Bosch VAF-meter equipped vehicles, aspiring to be MAF-equipped ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj. ------------------------------ End of DIY_EFI Digest V4 #475 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace "diy_efi-digest" in the command above with "diy_efi".