Resistor Ohm Meter

[TheMadMan]

Hi Adam
Take it you are a teacher/lecturer or something similar.
The majority of the reply to your comments is covered in my previous post.

There are 169 standard values (1 Ohm to 10 Meg-Ohm 5%).

Didnt know that - you live and you learn!

The screen display idea may be just the ticket for the lab top units you need. Maybe you could get the students to build them as a project for point credits. Get the local cash register company to "donate" some screens from old cash register units. As a plus, the students would unknowingly "learn" the color code for each value without even knowing it.

But first there must be a circuit diagram and in my experience, that is normally where things fade away. Fact of life I guess.

I have visions of 169 LEDs. One over each bin.

About 21 serial to parallel converters would give you a pin for each of the 165 bins so we are probably talking about a 40 pin unit with a fair amount of memory for the LED Selection array/s.

A nice “go / no go” method would be great, too.

Would probably need a keypad to set the "base" value to be tested against.
An easyer way would be a unit where you put a (example) 1K 1% resistor between 2 crocodile clips as a master and when you touch the 5% resistor onto the 2 test contacts, it works out whether the test piece is within 5% of the master. If it is, flash green led, if not, flash red led.
This will probably be far easyer to design and build.

I do not have the PIC skills or the programming skills to know how to begin either of these interesting projects.

I probably hav'nt either - YET! But a small detail like that should not stop us trying.

I have occasion to sort several thousand resistors. Every few months.

LUCKY!!!
Every time I run out of something, it means waiting for Saturday and then making a 150km round trip to re-fill the drawers. Very frustrating sometimes.
Sometimes I "substitute" but that cost me 4 opto-isolators and 8 leds this week. Bad News.

Best,