need pic16f676 based voltmeter code

s0y · Joined: 29 Mar 2015 Posts: 7

sir i need a pic16f676 based 7 segment voltmeter code
my hardware is this

temtronic · Posted: Sun Mar 29, 2015 8:33 am

If you use the 'search' feature of this forum,you'll find many 'threads' about your school project.

When you go to test it, be EXTREMELY careful ! 500V DC WILL KILL YOU !

I suggest you break the project into several smaller steps....

1) get PIC to run a '1Hz LED' program

2) configure PIC with LEDs and test each segment/display

3) code for a 0-9 sequence on the display

4) code for a 000-999 sequence for the display

5)code for 0-5 VDC into the ADC

6) code for 00-50 VDC for the display

I would NOT attempt a higher voltage unless you read and understand how and why it's critical to use proper layout of PCB, correct component values, etc.

HTH
JAY

s0y · Joined: 29 Mar 2015 Posts: 7

sir i need 0 to 500v ac not dc

temtronic · Posted: Sun Mar 29, 2015 10:20 am

OK.. NOW you'll need to design/build a precision AC to DC converter. Design specs are naturally based on frequency( I'm assuming 50Hz ?). Be sure to add proper protective devices in this 'analog front end'. If you don't best case...you fry the PIC, worst case, you get killed. 500 volts AC or DC is LETHAL.

You might consult any number of DVMs available on the market to see what they do.

I cannot suggest a 'real' circuit due to legal implications.

Jay

s0y · Joined: 29 Mar 2015 Posts: 7

Sir I have hardware. I need only sample code. I convert 500v ac to 5v dc for adc

Mike Walne · Joined: 19 Feb 2004 Posts: 1785 Location: Boston Spa UK

s0y · Joined: 29 Mar 2015 Posts: 7

https://www.sendspace.com/file/dga93h
my adc circuit
please sir help me for code

Ttelmah · Joined: 11 Mar 2010 Posts: 19539

That is not remotely safe.

A single component failure, and you are dead.

Is the resistor rated for 500vac (remember this potentially means a DC rating over 700v)?. What happens if this fails?.

s0y · Joined: 29 Mar 2015 Posts: 7

harware is not my problem .i need sample ccs code for it ac voltmeter

Ttelmah · Joined: 11 Mar 2010 Posts: 19539

Seriously, hardware _is_ your problem.

If that circuit was used by a student, he would be sent back a year. If it was used in a piece of commercial kit, it would fail every test needed before sale instantly. That circuit as shown, is roughly as dangerous as an electric chair.

Using non isolated signals immediately means every component round the PIC needs to be double insulated. Display etc..

It is a really dangerous circuit.

On the code, you have already been told to search the forum, this type of question has been answered many times here.

Nobody is going to write the code for you, especially since doing so, they could be considers 'accessories', when you kill yourself, or even worse somebody else.

s0y · Joined: 29 Mar 2015 Posts: 7

sir here this circuit already using in this project commercially
my ac volt not 500 every time.
it is normally 0-250v

temtronic · Posted: Mon Mar 30, 2015 10:55 am

That circuit is LETHAL !!!

DO NOT USE IT !!!

I cannot stress how important it is to NOT USE IT !!!

PICs are cheap, what is your LIFE worth ????

There is NO way that circuit is in ANY commercial product as it'd NOT pass even ONE of the safety codes on EITHER side of the pond.

It also is NOT a precision AC to DC converter. Even if you use it at MUCH lower voltages( <30 V AC), you'll have to have the PIC do a LOT of 'math' to get the 'numbers' right.

Jay

Mike Walne · Joined: 19 Feb 2004 Posts: 1785 Location: Boston Spa UK

temtronic · Posted: Mon Mar 30, 2015 1:48 pm

I suppose...
the good news is that since this is a Proteus/ISIS 'project', he really can't hurt himself with ISIS generated electrons...as they don't flow.
and...
the bad news is that since this is a Proteus/ISIS 'project', he really can't get it to work with ISIS ... as we all know ISIS is 'busted'.

Jay

s0y · Joined: 29 Mar 2015 Posts: 7

thanks