1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

PIC Tutorials - Going Equipped

Discussion in 'Microcontrollers' started by Musicmanager, Oct 20, 2015.

  1. atferrari

    atferrari Well-Known Member

    Joined:
    Oct 8, 2003
    Messages:
    2,810
    Likes:
    121
    Location:
    Buenos Aires - Argentina
    I posted before, thanking Nigel for the suggestion of using turned pins. Definitely, one of the most useful tips ever for me. I recall him saying he got it from somebody else. Not even dreamed to solder anything to them myself.

    BTW, in maybe 15 years I am still using the same old protoboard (that is even the brand, I think) and I can recall just one micro (16F84A?) with a pin bent and subsequently broken many months later. The rest (many), they were honourably discarded after being carefuly burnt somehow. And in case you ask, no, never seen that famous magick smoke. Brave PICs!
     
    Last edited: Nov 12, 2015
  2. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

    Joined:
    Nov 17, 2003
    Messages:
    39,199
    Likes:
    640
    Location:
    Derbyshire, UK
    I would imagine the most 'dangerous' process here is soldering the top of the socket and PIC pins :D (as you're soldering FAR closer to the chip than is normal) - in my experience there's no chance of the chip coming out of the socket, you need a small screwdriver to lever then out :D

    As long as you're happy, that's all that matters - but it's not really something that's required.
     
  3. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

    Joined:
    Nov 17, 2003
    Messages:
    39,199
    Likes:
    640
    Location:
    Derbyshire, UK
    It was from Don McKenzie at Dontronics in Australia.

    I also thought it was a great idea :D
     
  4. dave

    Dave New Member

    Joined:
    Jan 12, 1997
    Messages:
    -
    Likes:
    0


     
  5. JimB

    JimB Super Moderator Most Helpful Member

    Joined:
    Sep 11, 2004
    Messages:
    6,321
    Likes:
    585
    Location:
    Peterhead, Scotland

    A variation on the "PIC in a socket" idea, which I came up with some years ago:

    PIC Carrier 001.JPG PIC Carrier 002.JPG

    A turned pin socket for insertion into the usual breadboard, mounted on the socket were some turned pin SIL header strips, and built in to the whole assembly were the load capacitors for the crystal and the supply decoupling capacitor for the PIC.
    Wire ended crystals (HC25) could be plugged into the end of the SIL strips, and HC18 type crystals could be plugged into the crystal socket.

    This was all in the days of PIC 16F84.
    These days I use 16F628 and 16F887 with a built in oscillator.
    (Yes I know that there are newer types of PIC, but these are familiar friendly devices and I am comfortable with them for what I do.)

    JimB
     
    • Like Like x 1
  6. Musicmanager

    Musicmanager Active Member

    Joined:
    Dec 4, 2014
    Messages:
    585
    Likes:
    48
    Location:
    Birmingham, UK
    Ah well, I hadn't thought of that one ! I just like things to stay where I put them !! I'm a bit of a b****r for that ! Maybe I should leave the solder out of the process, then everybody will be happy :D

    I like JimB's idea of a PIC in a socket .. .. looks really good .. .. . along the same lines, if I stop soldering chips and sockets, maybe mine could be call a PIC in a Poke ?

    D'you think ?? :D

    S
     
  7. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

    Joined:
    Nov 17, 2003
    Messages:
    39,199
    Likes:
    640
    Location:
    Derbyshire, UK
    But like he said, only in the distant past - mind you, not 'that' distant as he specified the later 16F84 and not the earlier 16C84 :p

    The built-in oscillators was a great idea, and was one of the features that triggered my tutorials.
     
  8. JimB

    JimB Super Moderator Most Helpful Member

    Joined:
    Sep 11, 2004
    Messages:
    6,321
    Likes:
    585
    Location:
    Peterhead, Scotland
    Probably did start with the "C" version, I transitioned to the "F" when they became available.

    JimB
     
  9. Musicmanager

    Musicmanager Active Member

    Joined:
    Dec 4, 2014
    Messages:
    585
    Likes:
    48
    Location:
    Birmingham, UK
    I don't remember 16F84 or 16C84 :p

    Oh, so actually JimB is to blame !! ?? Now there's a thing ! :D

    S
     
  10. MrAl

    MrAl Well-Known Member Most Helpful Member

    Joined:
    Sep 7, 2008
    Messages:
    11,026
    Likes:
    951
    Location:
    NJ
    Hi,

    The machined pin sockets are great. I use them for the more important stuff.
    I have never seen an IC chip fall out of a socket, no matter what kind of socket it was.
    What i have seen though in some medical equipment was a pin somehow 'loosening' up, so that the IC pin does not contact the socket pin well enough for the required contact resistance. These were not machined pin sockets though, just the 'wipe' type sockets, and i cant remember if they were dual wipe or not unfortunately as this was back in the 1970's when 'regular family' TTL was still used all over the place.
     
  11. Inquisitive

    Inquisitive Super Moderator

    Joined:
    Aug 31, 2011
    Messages:
    922
    Likes:
    86
    Location:
    Georgia, USA
    Good ol' Chip Creep as they used to say. Caused by heating and cooling as in turn on and get hot then cool when off.
     
    Last edited: Nov 12, 2015
  12. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

    Joined:
    Nov 17, 2003
    Messages:
    39,199
    Likes:
    640
    Location:
    Derbyshire, UK
    I presumed you had :D
     
  13. MrAl

    MrAl Well-Known Member Most Helpful Member

    Joined:
    Sep 7, 2008
    Messages:
    11,026
    Likes:
    951
    Location:
    NJ
    Hi,

    Yes the thermal cycling probably eventually caused a break in the connection. These days i either use dual wipe or the machined pin type.
    What happens i think is the IC pin stays relatively still while the socket contacts move out and then back, until one day they dont move back enough. Those units had quite a bit of heat inside too because for one thing they were made out of the original TTL series like the 7400 series not the more modern 74LS00 or similar.
     
  14. Mike - K8LH

    Mike - K8LH Well-Known Member

    Joined:
    Jan 22, 2005
    Messages:
    3,637
    Likes:
    109
    Location:
    Michigan, USA
    Another point of failure which I've seen many many times is oxidation of the IC pins and/or the socket wipers. Often simply pulling the IC and re-seating it in the socket will restore device operation...
     
  15. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

    Joined:
    Nov 17, 2003
    Messages:
    39,199
    Likes:
    640
    Location:
    Derbyshire, UK
    A small 'squirt' of WD-40 along the socket helps as well :D
     
  16. be80be

    be80be Well-Known Member

    Joined:
    Aug 23, 2008
    Messages:
    4,791
    Likes:
    134
    Location:
    morristown,tn
    ONLINE
    Heck I've broke a pin or two off trying to get a IC out of a socket. I always seemed the ic puller was never around and they was 64 pin chips.
     
  17. Musicmanager

    Musicmanager Active Member

    Joined:
    Dec 4, 2014
    Messages:
    585
    Likes:
    48
    Location:
    Birmingham, UK
    I know, but I'm quite likeable when you get to know me :)

    By an IC Puller .. do you mean one of these ? IC Puller.jpg

    S
     
  18. granddad

    granddad Active Member

    Joined:
    Jan 18, 2015
    Messages:
    749
    Likes:
    75
    Location:
    Worcestershire UK
    MM don't buy one I have a spare ?
     
  19. Musicmanager

    Musicmanager Active Member

    Joined:
    Dec 4, 2014
    Messages:
    585
    Likes:
    48
    Location:
    Birmingham, UK
    Hi GD

    It's OK, I have two of those .. ..

    .. .. .. . when they made me, they were out of stock of fingers, they used Sainsburys pork sausages ! Therefore, essential equipment !

    S
     
    • Funny Funny x 1
  20. Mikebits

    Mikebits Well-Known Member

    Joined:
    May 24, 2008
    Messages:
    6,214
    Likes:
    174
    Location:
    San Diego, Ca
    Your wasting your talents on electronics my friend, you need a microphone and a audience. :p
     
  21. granddad

    granddad Active Member

    Joined:
    Jan 18, 2015
    Messages:
    749
    Likes:
    75
    Location:
    Worcestershire UK
    MM think you will find the puller shown above is for PLCC sockets... GD
     

Share This Page