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Thread: Arduino Mega As Body Controller(BCM)

  1. #31
    Constant Bitrate AutoWiz's Avatar
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    oh wow settra, I am just now noticing your location. My boss, Tony, is Greek and we take a week off of work every year so he can go visit Greece. He own a corvette restoration and performance shop here in south florida: https://www.facebook.com/CorvetteExperts?ref=br_rs . We also have a website,
    http://www.corvette-performance-expert.com/ , but I think the fb page is maintained more frequently. anyways he was really impressed with the carputer and car I have built and it's gonna blow him away when I tell him I have someone in Greece helping me control a/c with my carputer and show him this thread.

  2. #32
    Variable Bitrate
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    Sweet the shop seems really nice! tell him i am from Crete he will understand !

  3. #33
    Constant Bitrate AutoWiz's Avatar
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    ok, so to make this happen with my a/c I only need 11 digital pins, a handful of some transistors and a fistful of 5v relays. all of which I have. when the mega goes in, I have to rewire the nose of my car for my new 5 relay smart fan control. and I have a few arduino boards. so I am thinking about creating this on a nano for now and then just moving the finished product to the mega when I do the re-wire. the nano has plenty of pins and very small size. I will also add power windows and door locks down the road. the install will go fast. I don't even need a relay for the a/c compressor as I ran that circuit through the aem ems-4 so the ecu could shut it down at wide open throttle and above 5krpm. makes the compressor last longer and the car feel faster. i will post some pics when i have my ac controller built.

  4. #34
    Constant Bitrate AutoWiz's Avatar
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    ok, at this point I have finally finished the new bezel to relocate my screen. once paint has cured I will drill holes for power and hdd leds, and power and reset buttons and mount screen. I have also built my 5 relay fan controller. I am really happy with the clear 80a relays I found. they have small green leds to confirm when they are on. and I am building and testing control circuits for my a/c. I already have a working model, I am just trying to shrink a little. I found this cool proto board for an uno and I have been using it help speed up building/testing process. here are pics of current progress...
    Attached Images Attached Images     

  5. #35
    FLAC SNOtwistR's Avatar
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    WOW you have been busy. Nice work on that bezel, it's looking factory. Quick question are those relays built for automotive? I see 12v on them or are you regulating 12v power to them. I have seen a few people use industrial relays in automotive use and have seen a few with scorch marks, and by that I mean completely melted. Just a thought SNO

  6. #36
    Constant Bitrate AutoWiz's Avatar
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    the relays come from ebay. 12v and 80a. they are no more than you'd pay for any 12v automotive relay, but man they sure do look nice, and will make diagnosing problems/ troubleshooting easy. don't know if i'd trust running 80a of current through one of these, but for the 13" and 10" rad fans I have, they will do nicely. I will also be upgrading relays for hid hi and low beams and fuel pump with these. they are the same size and pinout as all other automotive relays, so they are a direct replacement.

  7. #37
    Maximum Bitrate
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    I think the concern with the non automotive relays is more the coil than the contacts. If you are controlling them from the computer/Arduino this should not be an issue.

    They generally also have a voltage rating range as well. Amperage is NOT the only thing that is important. If they are not designed for use up to somewhere in the 30 volts range they could break down. Remember that voltages in a car spike and using non automotive relays MAY allow arcing across the contacts if not rated for spikes over 12 volts. These arcs are what will burn up the relays regardless of it amperage setting.

    I have seen spikes in my vehicles and at work upwards of 30 volts... Automotive relays have built in protection against spiking so you MAY want to do further research into them. It may be as simple as adding a diode and capacitor. Or something similar.

  8. #38
    FLAC mauri's Avatar
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    Use the standard rule for any relay in an electronic circuit.
    Put a 1N4007 diode in opposite voltage on EVERY relay coil, otherwise the overvoltage peak in the exchanges burn the transistors that drive the relays.

  9. #39
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    here is a close up of the relays. there is a resistor and a diode built into each relay. and they are rated at 12v. my charging system never touches 15v. and here are some other relays I will be using for a/c control and ignition and start control, and power window control. these are 5v relays rated in 10 and 30a....
    Attached Images Attached Images   

  10. #40
    FLAC mauri's Avatar
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    In ANY case use the 1N4007...

    Edit:
    From screenprinting on the relay do not see the integrated diode ... the coil is polarized or not?
    If there is definitely the diode internally then ok, otherwise ALWAYS use it with electronic circuits and output uP \ transistor \ relay
    Last edited by mauri; 07-05-2014 at 02:11 PM.

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