Project Contribution Ideas

Discussion in 'The Projects Forum' started by MCU88, Mar 19, 2015.

  1. MCU88

    Thread Starter Member

    Mar 12, 2015
    360
    35
    Hello...

    I would like to contribute 6 projects to this site, and I am looking for some ideas from you as to what to submit. Please tell me what you would build and what you wouldn't. Or if you have some original ideas that you would like to see brought to life then please share them with me.

    Limitations:
    • Under USD 100 in parts to purchase
    • Battery powered
    • CMOS 4000 ICs
    • Common Linear ICs such as LM358
    • Common BJTs such as 2N2222
    • Common diodes such as 1N4007
    • Microcontrollers 16F628 and 16F887
    • mikroC Language
    • Single sided PCBs
    • Monochrome artwork

    Thanx! ;)
     
    absf likes this.
  2. bushrat

    Member

    Nov 29, 2014
    97
    22
    Microcontroller based IC tester, something I want to build but I have trouble with code..
     
  3. MCU88

    Thread Starter Member

    Mar 12, 2015
    360
    35
    Arh what an excellent idea! So something to test common CMOS 4000 ICs?
     
  4. MCU88

    Thread Starter Member

    Mar 12, 2015
    360
    35
    Ok so project 1 of 6 is CMOS 4000 IC tester. I need 5 more guys...
     
  5. bushrat

    Member

    Nov 29, 2014
    97
    22
    4000 series / 7400 series. some op-amps can work with single rail voltage, so possibly 5v rail can be used to power them up.
    Besides IC, 7-segment LED displays can also be used.
    All of that can be controlled by microcontroller, and if you leave instructions on how to modify the program for other IC's, then all you have to do is make it work for few of them and rest can be programmed by the user.
     
  6. DickCappels

    Moderator

    Aug 21, 2008
    2,654
    632
    This is blue-sky, but perhaps a "learn mode" could be supported to add new parts to the machine's repertoire -plug in a known good chip and press the "learn" button.
     
    mattbullet likes this.
  7. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,058
    3,820
    Capacitance and ESR tester for capacitors.
    Must measure ESR to 1 mOhm. Must test 100 pF to 10,000 uF

    Transistor tester.

    Light meter

    Duty cycle and frequency counter.

    IR emitter angle of half intensity
    Photo transistor angle of half intensity
     
  8. RichardO

    Well-Known Member

    May 4, 2013
    1,235
    384
    HP or Fluke or somebody made something like that in the 1980's. As I remember, they did some sort of a checksum on a single signal. I sure wish I could remember what the called it...
     
  9. MCU88

    Thread Starter Member

    Mar 12, 2015
    360
    35
    That's an high-tech solution there Dick. I cannot see the software solution for it off the top of my head though. Would it be an analogue system? I did build what is called an signature checker many years back. This is an diagnostics tool whereas you hook up leads to a part of an working board and compare the readout to the leads that are hooked up to an faulty board.

    What I did have in mind was to make it specifically for CMOS 4000 digital chips. The PIC's firmware would be hardcoded with protocols for each chip. For example... say an 4017 decade counter chip was inserted, then the rough pseudo code for this C function would be:
    1. Apply VDD to pin (n)
    2. GND to pin (n)
    3. Reset pin(n)
    4. Toggle clock input pin (n)
    5. Check output Q(n) for logic high
    6. Loop back to #4 for (9) cycles
    7. All outputs swung from low to high one at at time? Fall through...
    8. LCD to show "Chip Identified as CD4107"

    So with a few dozen chips hardcoded with protocols the firmware would scan through them until it found an logical match.
     
  10. RichardO

    Well-Known Member

    May 4, 2013
    1,235
    384
  11. absf

    Senior Member

    Dec 29, 2010
    1,492
    372
    A better CMOS logic probe with indicators for Hi, Lo, open & pulse. Front end may use LM339 comparators.

    Would be nice if able to show frequency on a 4 digit led display (up to 20 MHz) and duty cycles of the signal measured. Duty cycle would be displayed with just the On-Cycle of 0%-99% should be enough. Design with 16F628A or 16F886 (28p PIC) would be fine.

    Allen
     
  12. MCU88

    Thread Starter Member

    Mar 12, 2015
    360
    35
    Nice idea ;)

    I did a super probe years ago for a magazine, but it was never published. It did not show frequency or duty cycle though. It did however have memory to store the high and low readings that it measured, and plugged into an computer for upload of acquisition data.
     
    absf likes this.
  13. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    I would go for an ESR meter
     
  14. MCU88

    Thread Starter Member

    Mar 12, 2015
    360
    35
    In Australia they sold thousands as KITs at Dick Smith Electronics two decades ago. I build one.
     
  15. absf

    Senior Member

    Dec 29, 2010
    1,492
    372
    GopherT likes this.
  16. absf

    Senior Member

    Dec 29, 2010
    1,492
    372
    Yes, I have a few issues of Electronics Australia in the 70s or 80s. I made the DIGI tester which included 4 bit LED display, a clock generator with selector switch for different frequencies. And 2 buttons for generating Low to High and High to Low pulses.

    Not sure if there was a kit for it..

    Allen
     
  17. MCU88

    Thread Starter Member

    Mar 12, 2015
    360
    35
    All been done before. The ESR meter. The IC tester. The cap meter. The super logic probe.

    *bangs head against wall for original never done before ideas*
     
Loading...