Let's Make Robots!

Logic Probe (Logic "Box"?)

Tests the sorta stuff you would test on robots

Inspired by a post by Geir Andersen, I decided to make a little tester box. Nothing too fancy, and (I'm sure) not properly put together, but enough to be able to so some regular, every-day testing of robot stuff.

  • High and Low states
  • Continuity --Yes, I know that High and Low sorta covers this one but the rotary switch has 6 clicks! I has to use more than 2 or 3 or them!
  • Pulse Width (in uS) with a high trigger
  • Pulse Width with a low trigger
  • Audio (and the ability to turn the gosh-darn beeping off!)

The brain for the whole system is a Atmega 328 who's real home is as the backpack for the LCD. Everything else was selected because it happened to be in the parts box. As a matter of fact, I even found the rotary switch in there --which still had the resistor bridge soldered on from the last project.







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The case comes from a company called Bud Industries. Here is the link that goes straight to the enclosures. They don't sell them directly, mind you --but they have links to suppliers (mouser, digi, etc.)

On the subject of project case, I found this site. They seem to have quit a line up.

Well, Geir --Thanks, but I would say it looks pretty good except for the 2 huge X-acto slips around the LCD cut-out! I knew I should have done it with a router and template --alas, I guess I will have to just sand and paint (I wanted something more than plain black anyway).

I like your ideas, I had a lot of them myself. I was also thinking about a resistor-checker (so I don't have to check colors). I would also like to experiment with those non-contact ring-things that can measure the current in a wire. Inductive testing, I think it is called.

As always Chris, a perfect project and a great presentation. I love the quality of your builds and there is not a spot of hot glue in site (there maybe one under the voltage regulator :-) ).
Anyway as you have most of the hardware already I would like to utter some possible enhancements.
• Break out the RX line from the Arduino and just dump it out on the LCD (You might need some way of changing the baud rate though)
• A simple voltmeter. So you can look for voltage drops.
• A function to see how stable the power line is and indicate if there is voltage spikes.

Firstly great project,secondly Im curious from where did you buy those black project boxes?

Really good use of materials, looks a lot better than the packaging I did on a PH Anderson probe from long ago. Really looks good, and very capable. 

A lot fewer required passives than the PIC based probe I saw.