[sudo-discuss] vending machine is working!

[Jake]

i've already got the circuit basically figured out in my head, i just need 
to lay it out and then assemble it.  basically it's an atmega DIP chip, 15 
N-FETs, 5 P-FETs (turned on by N-FETs), and an I-bridge (probably an 
IXDD604PI mosfet driver) to generate the squarewave, whose output connects 
to the - side of an isolated 12VDC power supply for the motors.

whoa, i just realized i can tap directly from the transformer on a 12VDC 
switching power supply to get the voltage i need - 12VDC plus a squarewave 
at 32 KHz.  No need for an I-bridge or anything, just a little 22ohm 
series resistor whose AC is capacitively coupled to one of the analog 
inputs for detecting homing.

On Thu, 19 May 2016, Adam Munich wrote:

> try http://www.falstad.com/circuit/, it's what I use when designing
> analog filters / simple signal stuff
>
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> Weblog: http://adammunich.com
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> On Thu, May 19, 2016 at 12:54 PM, Jake <jake at spaz.org> wrote:
>> i'm trying to think of the right way to generate a 5-10 volt 32KHz
>> squarewave in series with the 12v power supply for the motors, so that an
>> analog input can measure the amplitude of AC detected across a series
>> resistor.  The homing switches of the motors have a capacitor that decreases
>> their impedance at 32KHz when they're "home".
>>
>> the control circuit for the motors is a row/column array, so I also need to
>> lay that out.
>>
>> #define NUMROWS 5
>> #define NUMCOLS 10
>> byte rows [NUMROWS] = { 13,12,11,10,9 }; // connect rows to positive
>> byte cols [NUMCOLS] = { 8,7,6,5,4,3,2,A2,A3,A4 }; // connect cols to
>> negative
>>
>> -jake
>>
>>
>>>>> On Thu, May 19, 2016 at 9:18 AM, Morgan Allen <morganrallen at gmail.com>
>>>>> wrote:
>>>>>>
>>>>>>
>>>>>> I have ESP8266 dev boards to donate!
>>>>>>
>>>>>> On Fri, May 6, 2016 at 7:50 PM, Jake <jake at spaz.org> wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> as I said in February, the vending machine is basically at operational
>>>>>>> status:
>>>>>>>
>>>>>>> https://sudoroom.org/pipermail/sudo-discuss/2016-February/011770.html
>>>>>>>
>>>>>>> and as I said in April, I now know how we will perfect the motor
>>>>>>> homing
>>>>>>> issue:
>>>>>>>
>>>>>>> https://sudoroom.org/pipermail/sudo-discuss/2016-April/011894.html
>>>>>>>
>>>>>>> but for now, it works well enough that I was able to dispense one of
>>>>>>> the
>>>>>>> candy bars in the machine without cheating and opening up the machine.
>>>>>>>
>>>>>>> I didn't even need to power cycle it, the beaglebone in there was just
>>>>>>> up
>>>>>>> and working already!
>>>>>>>
>>>>>>> thanks to rcsheets who stocked the vending machine with delicious
>>>>>>> candy
>>>>>>> bars!  products 1030, 1031, and 1032 by the way
>>>>>>>
>>>>>>> let me know if you want to help get the vending machine working
>>>>>>> better.
>>>>>>>
>>>>>>> we need simple hardware work, complex hardware work, and software
>>>>>>> work!
>>>>>>>
>>>>>>> -jake
>>>>>>> _______________________________________________
>>>>>>> sudo-discuss mailing list
>>>>>>> sudo-discuss at lists.sudoroom.org
>>>>>>> https://sudoroom.org/lists/listinfo/sudo-discuss
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>>
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>>>>>>
>>>>>> _______________________________________________
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>>>>>> sudo-discuss at lists.sudoroom.org
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>>>>>>
>>>>>
>>>>
>>>
>>
>