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Thread: Anyone interested in serial controlled Relay/Input card?

  1. #31
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    sounds cool, I had thought about working on a similar project if not for lack of time...

  2. #32
    Variable Bitrate darkhalo's Avatar
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    im down. although im just a lowely 2nd year EE student and i haven't taken EE classes yet, ill do my best.
    Carputer: 2.8Ghz P4, 512 RAM, 120gb HDD, WIFI, TV tuner, CDRW/DVDROM, Slot load DVD in front.
    Screen: Lilliput 7" touchscreen (Custom made Carbon Fiber Screen Enclosure)
    S2000 Carputer

  3. #33
    Maximum Bitrate Danceheaven's Avatar
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    Quote Originally Posted by Ricky327
    Have you got the link or info about this 72 I/O card?

    I need to find out more whats the best way to get the digital and analog inputs. Like the input sensitivity of the analog inputs. And the pull-up/pull-down of the digital inputs...I may also set the trigger voltage at 6V. The relay card Im working on should work with standard car relays up to 40A and are to be placed offboard as adons.

    Ill love to get all this done on USB in the future.
    USB would be much better as RS232 9 pin cmm ports are been phased out! and USB is the way to go, my mate showed me a great Dev kit he picked up, all usb 1.1/ 2.0 etc, it has ADC - DAC the lot cant remember how many i will get more info from him soon its a great find and only 70, yep im in the uk... i will upload the pdf for my 72 i/o card and pm u the link soon cheers mate
    Co Develper of A.I.M.E.E Automotive Intelligent Multimedia Entertainment Engine
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  4. #34
    Maximum Bitrate Danceheaven's Avatar
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    Quote Originally Posted by Ricky327
    Have you got the link or info about this 72 I/O card?

    I need to find out more whats the best way to get the digital and analog inputs. Like the input sensitivity of the analog inputs. And the pull-up/pull-down of the digital inputs...I may also set the trigger voltage at 6V. The relay card Im working on should work with standard car relays up to 40A and are to be placed offboard as adons.

    Ill love to get all this done on USB in the future.
    USB would be much better as RS232 9 pin comm ports and parrallel ports are been phased out! and USB is the way to go, do suppose you know if a USB to Serial converter will suffice do you? my mate showed me a great Dev kit he picked up, all usb 1.1/ 2.0 etc, it has ADC - DAC the lot cant remember how many i will get more info from him soon its a great find and only 70, yep im in the uk... i will upload the pdf for my 72 i/o card and pm u the link soon cheers mate
    Co Develper of A.I.M.E.E Automotive Intelligent Multimedia Entertainment Engine
    www.aimee.cc

  5. #35
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    Yes you are right and Ill love to go USB.

    I have checked the microchip site and they have :

    PIC16F745 : 22 I/O, 5 8-bit ADC, USB for $2.86
    PIC16F765 : 33 I/O, 8 8-bit ADC, USB for $3.42

    Those 2 chips are ideal for car PC but unfortunately they are only available in OTP
    I dont have a proper development tools to emulate it and cant afford to blow $2.86 each time I wanna change a bit in the code. It may also save me a 5V regulator in the design.

    Adding a Serial-USB converter should work but they cost abit, about 25 from maplins.

    The thing is Im not even too sure how the USB device can be controlled through windows. If theres a development apps that can send and receive data from the USB device then atleast I can look into it...if you know something please do let me know.

    In the mean time I guess the serial version will have to do for now. At least its simple to control via hyperterminal. Unless I can program the PIC such that it also emulate a comport via USB

  6. #36
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    Quote Originally Posted by Ricky327
    Yes you are right and Ill love to go USB.

    I have checked the microchip site and they have :

    PIC16F745 : 22 I/O, 5 8-bit ADC, USB for $2.86
    PIC16F765 : 33 I/O, 8 8-bit ADC, USB for $3.42

    Those 2 chips are ideal for car PC but unfortunately they are only available in OTP
    I dont have a proper development tools to emulate it and cant afford to blow $2.86 each time I wanna change a bit in the code. It may also save me a 5V regulator in the design.

    Adding a Serial-USB converter should work but they cost abit, about 25 from maplins.

    The thing is Im not even too sure how the USB device can be controlled through windows. If theres a development apps that can send and receive data from the USB device then atleast I can look into it...if you know something please do let me know.

    In the mean time I guess the serial version will have to do for now. At least its simple to control via hyperterminal. Unless I can program the PIC such that it also emulate a comport via USB
    yea thats the problem with microchip and USB, i have a few 745 and 765 but I never bothered with them becuase I dont have any of the UV erasable ones since they are too expensive...
    microchip is supposed to have a few 18F USB but they still have not been released, rumor is they will be out by the end of the year.
    I know a bunch of 8051 varients support hardware USB
    serial is so much easier to develop with though...

  7. #37
    What can I say? I like serial. Curiosity's Avatar
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    Have you thought about anything like custom commands? Like say if it were constantly powered even when the PC is off and it could store commands in RAM like "if X goes high, wait Y seconds, set Z high" in a small array like 32 bits per command, then you could have it turn the PC on if the doors are unlocked or a timed SDC. Things like that. It would have to constantly loop monitoring the I/O pins and use a clock for timing, but I think it could be useful for many applications and make it really flexible.

  8. #38
    Maximum Bitrate Yuriy's Avatar
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    I am very interested! I'd love to buy a few! Just wondering whether you could write a small plugin for "Girder" software - it would be really cool because then we could just control the relays with any device (i.e. remote, keyboard, mouse, voice, OS events, etc.) without any special software. 8 relays would be a bomb, man! I'd love to be able to start my carputer with ignition and standby it when it's off! And I'd love the ability to control windows with my remote. I could even go as far as to make presets to window position so that I could just press a button and my windows would auto-adjust. You can do all that with Girder software. Yeah, that would be cool if I won't have to spend $100 on a relay board
    00 Saturn SL2, boosted @ 8 psi - CarDomain
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  9. #39
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    Quote Originally Posted by Curiosity
    Have you thought about anything like custom commands? Like say if it were constantly powered even when the PC is off and it could store commands in RAM like "if X goes high, wait Y seconds, set Z high" in a small array like 32 bits per command, then you could have it turn the PC on if the doors are unlocked or a timed SDC. Things like that. It would have to constantly loop monitoring the I/O pins and use a clock for timing, but I think it could be useful for many applications and make it really flexible.
    Yes I have been thinking about something along the line but not fully programmable as you described. My thought is to have a built in startup/shutdown controller as well as low voltage shutdown and PSU relay controlled, used for shutting the invert/PSU off completely. I have already got the code for it from the previous project. Your idea is just great...just a matter of including it in the PIC code. Ill look in to it.

    Damn I need more I/Os now...Please stop giving me more great ideas, its making me drool

  10. #40
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    Ricky, "no more ideas" , you mean you are not going to give me a button wherby if pressed the windows go up and the AC kicks in at a preset temp! oh....well....

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