Sorry to butt in again... it has occurred to me that this Pi plus breadboard
setup is adaptable to Capacitor measurement.
Based upon the CxR product involved, if you alter the Capacitor value you get
a proportionate change in the observed voltage and a change in the generated
output.
Food for thought.
john
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________________________________
From: raspberry-vi-bounce@xxxxxxxxxxxxx <raspberry-vi-bounce@xxxxxxxxxxxxx> on
behalf of john peacocke <peacocke@xxxxxxxxxxxxx>
Sent: Thursday, August 9, 2018 2:52:01 PM
To: raspberry-vi@xxxxxxxxxxxxx
Subject: [raspberry-vi] Re: Alternative to breadboards?
Referring to the dread-board.... A lot can be achieved if a large size bread
board is chosen.
You can quarantine components by plugging them neatly away from the main
action and bringing wire connections across according to need.
I explain... The breadboard is divided up the middle, think of a fishbone with
the central spine removed. This allows a DIL (the traditional shape of IC)
to be put in a-straddle of the central gap, connections made independently to
individual ribs.
Thus you have the opportunity to connect many components to any one of the legs
of the IC.
These components could be waiting, further along the central gap,, backs to
the central gap, plugged in with their legs completely isolated in the same
way.
Hence the benefit of having enough space to play on.
A word of warning... The breadboard will have Power Rails running on the long
sides of the board. These are the only metal which run contrary to the ribs,
and you do not need to use them. They are the two outermost rows, and they
exist at top and bottom (landscape view) of the breadboard.
Navigating the barren plains of the breadboard can be made easier by putting
in markers and guide rails , e.g. short dress pins or groups of pins or
hairclip shapes of wire or even a corral made of insulated wire stretched
neatly between holes.
As long as you do not cross-connect those ribs which are in use it will be ok.
A wooden toothpick is perfect for pinging male contacts and for counting along
the rows and columns.
Reading resistor values.... Unlike Hi Fi and Analogue Radio, only a few
resistor values are needed for digital devices.
Here is a link to a very simple Pi sensor adaptable for resistance values.
You will need a sighted person to show where the 3 connecting wires go to a
breadboard. Total of 4 components.
http://razzpisampler.oreilly.com/ch08.html
The use of a variable resistor gives a clue to a work-around. If a battery is
connected to your unknown resistor, via a known resistor, you get a voltage
from the common point which is in proportion to the ratio of the two values.
In fact, the potentiometer goes away and is replaced by the two resistors.
No, you at the back, you will just have to wait for the bell.
OK, so the Raspberry-pi ADC discriminates and certain voltages will generate
corresponding value printouts or speech or even generate audio codes.
Worth discussion anyhow.
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________________________________
From: raspberry-vi-bounce@xxxxxxxxxxxxx <raspberry-vi-bounce@xxxxxxxxxxxxx> on
behalf of Mike Fox <mfox32322@xxxxxxxxx>
Sent: Thursday, August 9, 2018 12:41:01 PM
To: raspberry-vi@xxxxxxxxxxxxx
Subject: [raspberry-vi] Re: Alternative to breadboards?
Well for resistors I had to buy a multimeter. I'm still learning all it
can do, and supposedly it has Bluetooth functionality - so a program that
speaks the values might be something I could do. But just as the
multimeter got me past the resistor-reading problem, I'm thinking there
must be some other gadget that can help with the breadboard problem. What
are these kits you guys are talking about?
On Thu, Aug 9, 2018 at 1:29 AM, Eric Oyen <eric.oyen@xxxxxxxxx> wrote:
Oh yeah! The old radio shack 150-in-1 electronics project kits. I always
had loads of fun with those, especially the radio transmitter circuits.
DE n7zzt Eric
On Aug 8, 2018, at 10:09 PM, Scott Granados <scott.granados@xxxxxxxxx>wrote:
the leads attached to springs and youd patch the kits with wires to form
You know what I used to like were the electronic training kits that had
the connections. Totally impractical for building anything permanent but
was a great way to learn electronics for a blind fellow like me anyway.
Built radios and oscillators etc by hand following the wire by numbers book.
accommodate Integrated chips and other precisely spaced components. I
On Aug 9, 2018, at 12:01 AM, Eric Oyen <eric.oyen@xxxxxxxxx> wrote:
Unfortunately, the spacing happens to be an industry standard to
worked extensively with these back in the 1980s when in high school and
later at DeVry Institute of Technology. Believe me, even the sighted can
have issues with using these boards. I can tell you that using another type
of board (for wire wrapped circuits) can be a real nightmare for us blinks.
own circuits. I still have a visual memory of how things can be placed andBtw, I have been having some thoughts to getting back into building my
its not all that hard to use a small set of needle nosed pliers to bend
leads to the right distance. And yes, with some short wire leads, you can
put together a surprisingly neat circuit that is even easy for a blind
person to follow.
the resistors as well as the values stamped on the capacitors.
Now, I just wonder if there is an app that will read the color codes on
(reading
DE n7zzt Eric.
On Aug 8, 2018, at 8:20 PM, Mike Fox <mfox32322@xxxxxxxxx> wrote:
Hey guys,
So I finally got a multimeter and broke the first visual barrier
They'reresistors) and five minutes later I've hit another: breadboards.
of anlike an Excel spreadsheet for Ant-Man. If I could shrink to the size
soant, I might have a shot at putting everything in the right place, but
wiresfar that's my best guess as to how to crack this one. The "cells" are
spaced way, way too close together, and when components have 3 or 4
know ifthat need to be plugged in at exactly the right place, I just don't
andI can do it. I got one of my projects working by sheer fluke, plugging
stuff around wherever I guessed the crappy diagram said, but I can tell
this probably isn't the right way to do things. :)
So is there such a thing as a breadboard with better spacing between
cells? Or maybe a way to link two wires without being required to use
one? I heard somewhere that "electrical tape" can tape them together
far-fetched.they would still conduct electricity, but that sounds pretty
thisEither way, I'd be interested in any strategies you guys use to get by
Pi Foundation.insanely way-too-visual obstacle. Thanks in advance. :)
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Archives: //www.freelists.org/archives/raspberry-vi
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Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry
views and attitudes expressed by the subscribers to this list do not
This list is not affiliated to the Raspberry Pi Foundation and the
reflect those of the Foundation.
Pi Foundation.
Mike Ray, list creator, January 2013
===========================================================
The raspberry-vi mailing list
Archives: //www.freelists.org/archives/raspberry-vi
Administrative contact: <mike.ray@xxxxxxxxxxxxxx>
-----------------------------------------------------------
Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry
and attitudes expressed by the subscribers to this list do not reflect
This list is not affiliated to the Raspberry Pi Foundation and the views
those of the Foundation.
Mike Ray, list creator, January 2013
===========================================================
The raspberry-vi mailing list
Archives: //www.freelists.org/archives/raspberry-vi
Administrative contact: <mike.ray@xxxxxxxxxxxxxx>
-----------------------------------------------------------
Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry Pi
Foundation.
This list is not affiliated to the Raspberry Pi Foundation and the views
and attitudes expressed by the subscribers to this list do not reflect
those of the Foundation.
Mike Ray, list creator, January 2013
