Autosense shield for Due

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This topic contains 17 replies, has 0 voices, and was last updated by Profile photo of that_kid that_kid 1 year, 9 months ago.

Viewing 15 posts - 1 through 15 (of 19 total)
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  • #177
    Profile photo of Eric
    Eric
    Keymaster

    So I’ve been playing with the shield all day and come up with some thoughts.

    Volume control is very much doable, but which route do I go? Do I go the inexpensive route and use just use a digital potentiometer which will work, but may[/i:1b87

    #885
    Profile photo of -Jeff-
    -Jeff-
    Participant

    Yes – Audio switch and volume control (4 inputs)
    Yes – HD Tuner connection (with hookup cable)
    Yes – EEPROM
    Don’t care (my car is PRE-CANBUS) – CANBUS connections
    YES – Temperature sensor connections
    YES – Possible connection for GPS (for devices without

    #888
    Profile photo of Eric
    Eric
    Keymaster

    Thanks for the input Jeff.
    The self configuring part would be since Autosense could identify that the “official” shield is plugged in it would know where things are hooked up. So the temperature sensors would just need to be plugged in and then

    #894
    Profile photo of that_kid
    that_kid
    Participant

    Yes – HD Tuner connection (with hookup cable)
    Yes – EEPROM
    Yes – CANBUS connections
    I personally don’t have any use for this but I’m sure it could come in handy for others- Temperature sensor connections
    Yes, plus you could expand the gps use in the futur

    #895
    Profile photo of Eric
    Eric
    Keymaster

    OK. This is some good feedback.
    Most of the stuff is inexpensive, such as temp sensor connections. Minor stuff that some people want, others may not.
    What’s your thoughts on fets vs a nice beefy PNP transistor (to supply 12v instead of ground).

    On

    #914
    Profile photo of Eric
    Eric
    Keymaster

    So I’ve been working on the shield. So far I’ve planned for 12 input using a 2×6 micro mate-n-lok connector. It’s compact, locking, and works well. I’ve got 10 outputs using screw terminals that can handle 10 amps, and using P channel fets that are rat

    #915
    Profile photo of -Jeff-
    -Jeff-
    Participant

    Voltage regulator? Car voltage will fluctuate a bit

    #916
    Profile photo of Eric
    Eric
    Keymaster

    I could put a power supply on it. Something to offer nice clean power. A simple voltage regulator won’t be enough.

    #917
    Profile photo of -Jeff-
    -Jeff-
    Participant

    I meant for the 12v in you mentioned.. I was going to suggest power supply.. But cost will go up

    #918
    Profile photo of Eric
    Eric
    Keymaster

    Yeah. The 12 volts is just a switch from the supplied voltage to an output. So you could turn on an amp or something with fairly low requirement, or use a relay for bigger stuff.
    It would probably be a good idea to offer a PSU so I know the power is cle

    #919
    Profile photo of Eric
    Eric
    Keymaster

    I think I’ll filter the 12 volts as clean as possible, and then just use the regulators already on the Due for the remaining filtering and regulating.
    If we’ve already got 12 volts coming into the board it would be easy to filter and use as a supply. I

    #920
    Profile photo of Eric
    Eric
    Keymaster

    So this is a rough price breakdown so far. These are all approximate cost of components only, no markup for my work 🙁

    Base unit: includes 4 layer PCB, pin headers, po

    #921
    Profile photo of that_kid
    that_kid
    Participant

    @eric wrote:

    What’s your thoughts on fets vs a nice beefy PNP transistor (to supply 12v instead of ground).

    The fets have lower internal resistance so they will pass more current and create less heat.

    #923
    Profile photo of -Jeff-
    -Jeff-
    Participant

    Looks good.. I think I would not need: CANBUS/ Audio switch & Volume control

    for the I/O Components how many are there going to be for the $20 of components?

    FTDI like this:
    <a class="postlink" href="https://www.sparkfun.com/products/9873

    #925
    Profile photo of Eric
    Eric
    Keymaster

    Cool, like I said I’ll build to suite when finalized and charge accordingly.
    The input is a 12 pin connector that you an use for buttons, switches, or any digital signal going into the board that provides ground. So you could hook it up to a pin switch

  • Author
    Posts
  • #177
    Profile photo of Eric
    Eric
    Keymaster
    • Offline

    So I’ve been playing with the shield all day and come up with some thoughts.

    Volume control is very much doable, but which route do I go? Do I go the inexpensive route and use just use a digital potentiometer which will work, but may[/i:1b87

    #885
    Profile photo of -Jeff-
    -Jeff-
    Participant
    • Offline

    Yes – Audio switch and volume control (4 inputs)
    Yes – HD Tuner connection (with hookup cable)
    Yes – EEPROM
    Don’t care (my car is PRE-CANBUS) – CANBUS connections
    YES – Temperature sensor connections
    YES – Possible connection for GPS (for devices without

    #888
    Profile photo of Eric
    Eric
    Keymaster
    • Offline

    Thanks for the input Jeff.
    The self configuring part would be since Autosense could identify that the “official” shield is plugged in it would know where things are hooked up. So the temperature sensors would just need to be plugged in and then

    #894
    Profile photo of that_kid
    that_kid
    Participant
    • Offline

    Yes – HD Tuner connection (with hookup cable)
    Yes – EEPROM
    Yes – CANBUS connections
    I personally don’t have any use for this but I’m sure it could come in handy for others- Temperature sensor connections
    Yes, plus you could expand the gps use in the futur

    #895
    Profile photo of Eric
    Eric
    Keymaster
    • Offline

    OK. This is some good feedback.
    Most of the stuff is inexpensive, such as temp sensor connections. Minor stuff that some people want, others may not.
    What’s your thoughts on fets vs a nice beefy PNP transistor (to supply 12v instead of ground).

    On

    #914
    Profile photo of Eric
    Eric
    Keymaster
    • Offline

    So I’ve been working on the shield. So far I’ve planned for 12 input using a 2×6 micro mate-n-lok connector. It’s compact, locking, and works well. I’ve got 10 outputs using screw terminals that can handle 10 amps, and using P channel fets that are rat

    #915
    Profile photo of -Jeff-
    -Jeff-
    Participant
    • Offline

    Voltage regulator? Car voltage will fluctuate a bit

    #916
    Profile photo of Eric
    Eric
    Keymaster
    • Offline

    I could put a power supply on it. Something to offer nice clean power. A simple voltage regulator won’t be enough.

    #917
    Profile photo of -Jeff-
    -Jeff-
    Participant
    • Offline

    I meant for the 12v in you mentioned.. I was going to suggest power supply.. But cost will go up

    #918
    Profile photo of Eric
    Eric
    Keymaster
    • Offline

    Yeah. The 12 volts is just a switch from the supplied voltage to an output. So you could turn on an amp or something with fairly low requirement, or use a relay for bigger stuff.
    It would probably be a good idea to offer a PSU so I know the power is cle

    #919
    Profile photo of Eric
    Eric
    Keymaster
    • Offline

    I think I’ll filter the 12 volts as clean as possible, and then just use the regulators already on the Due for the remaining filtering and regulating.
    If we’ve already got 12 volts coming into the board it would be easy to filter and use as a supply. I

    #920
    Profile photo of Eric
    Eric
    Keymaster
    • Offline

    So this is a rough price breakdown so far. These are all approximate cost of components only, no markup for my work 🙁

    Base unit: includes 4 layer PCB, pin headers, po

    #921
    Profile photo of that_kid
    that_kid
    Participant
    • Offline

    @eric wrote:

    What’s your thoughts on fets vs a nice beefy PNP transistor (to supply 12v instead of ground).

    The fets have lower internal resistance so they will pass more current and create less heat.

    #923
    Profile photo of -Jeff-
    -Jeff-
    Participant
    • Offline

    Looks good.. I think I would not need: CANBUS/ Audio switch & Volume control

    for the I/O Components how many are there going to be for the $20 of components?

    FTDI like this:
    <a class="postlink" href="https://www.sparkfun.com/products/9873

    #925
    Profile photo of Eric
    Eric
    Keymaster
    • Offline

    Cool, like I said I’ll build to suite when finalized and charge accordingly.
    The input is a 12 pin connector that you an use for buttons, switches, or any digital signal going into the board that provides ground. So you could hook it up to a pin switch

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