Jump to content

Universal Panel Meter

Recommended Posts

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.





Link to post
Share on other sites
  • 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?

Link to post
Share on other sites

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 :) ?

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...