Need voltmeter ammeter for PSU

[pooter]

Need help with voltmeter ammeter for PSU

Hi everyone, I am new to this board and very new to micro controllers. I have searched for weeks trying to find a design suitable and so far nothing fits my needs.

I am building a power supply 0-30V 0-3A

http://www.electronics-lab.com/projects/power/001/index.html

I would like to have a LCD volt and ammeter to monitor its output.

This is the design I am starting with

http://www.electronics-lab.com/blog/?p=5417

The problem with this design and most all the others I can find is it only displays one decimal place.

I would like for it to have a resolution of 0.05mV and 0.05mA and display at least 2 or 3 decimal places.

I've seen this requested on many sites, only for most to say it is very difficult floating point math, but it never got truly addressed or answered.


Any help you can provide would be greatly appreciated.

 

[tusemo]

Re: Need help with voltmeter ammeter for PSU

I have made a digital voltmeter you can use as voltmeter part, as ammeter part use a piece of cable (you must know the resistance per meter) or a high powered low valued resistor (shunt resistor - generally aluminium shield resistor). The microcontroller is pic16f877a and 1602B lcd screen, and codes in pic ccs c complier.

 

[pooter]

Re: Need help with voltmeter ammeter for PSU

Thanks very much. It will be useful.