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Universal Panel Meter


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The MCU is MSP430G2xx3 and the display is Nokia 5110. The project is not finalized, I will add schematic and board later on.

Here are the specs:

Number of channels: 2

Reference: internal or external (space for optional Maxim's, Linear's, and TI's Vrefs.)

Input protection.

Optional shunt resistor.

Host connection: SPI, UART (optional RS232.)

Optional resistor divider and multi turn pot.

Two general use outputs/inputs

Two switches

Board size: 45mm x 45mm (50mm with optional switches and LEDs,) matches 5110 footprint.

 

Little background. My original panel meter was designed to fit behind 4 digit 0.56" LED display. Then I figured it will be better to use 16x2 LCD which will let me display more information. Now, after playing around with 5110, I decided that this display is the perfect choice for me since nothing beats nice GUI.

 

 

post-197-135135521775_thumb.png

post-197-13513552178_thumb.png

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  • 1 month later...
It can do current (as pictured) using shunt resistor, but no auto-ranging.

 

sorry, was being blind. Anyhow! Super cool concept and theres still alot you can build off this. I really wanted to make something like this at some point. I only got a 10year old radio shack multimeter so a replacement is needed. Thanks for sharing :) Any chance you would be willing to share project code for newbsauce like me?

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Nice project ... I like it. I was playing with something similar for a bench power supply I am building.

 

I have one question. While working on my meter I noticed that the ADC on the MSP430 has an habit of influencing the "measured" circuit with its impedance. For example in my case a simple voltage divider that brings 0-20V to 0-3.3V is influenced by the ADC input impedance in quite nasty ways.

 

I do not see anything special in the input channel circuits you have in the schematics that would deal with this issue. Or am I missing something obvious as a novice that I am :) ?

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