Multimeter inbox 1: The idea

RE: Multimeter inbox 1: The idea

fvan — Sun, 29 Mar 2015 11:43:43 GMT

Fun project idea [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-8a82b373-bb77-4d56-8eda-d53271a9dfca/contentimage_5F00_1.png:16:16]

Reminded me a bit of http://makezine.com/projects/data-dial-dashboard/ perhaps there is some useful information there for you to use.

RE: Multimeter inbox 1: The idea

crjeder — Sun, 29 Mar 2015 11:13:34 GMT

Hi!

What about using the servo to move the needle? I came across a similar project: https://github.com/jquatier/servometer

RE: Multimeter inbox 1: The idea

mcb1 — Fri, 27 Mar 2015 01:44:43 GMT

Samuel

I think you'll find it doesn't actually require 12v on the meter itself to drive it fullscale.

One clue is that it used a 9v battery to drive the continuity to fullscale, but apart from some automotive type meters, most are a low current meter across a resistor.

I'd suggest tracing the circuit out and then you'll know what you're dealing with, and can adjust how you drive it.

It will still work using your PWM technique.

Mark

RE: Multimeter inbox 1: The idea

Workshopshed — Thu, 26 Mar 2015 17:09:03 GMT

Hi [mention:590bdfc3e4dd4b3ca2e68040d68579e2:e9ed411860ed4f2ba0265705b8793d05], a good project with a clearly defined scope. If you've been using a Leonardo then the Yun will feel very familiar (except when you get to the networking side), I see you already spotted that it does not have a regulator so needs 5v on the input. I've also not used a Yun before but have been reading up. I'm working on the mechanical aspects of my project but hope to do a getting started with the Yun post on 6th April (assuming it turns up before then).

Given that old multi-meters are not designed to be constantly running I'm wondering if you will have any issues with the coil heating up? There is a thermistor in the kit provided so you could use that when testing it.

Cheers,

Andy