[SOLVED] PIC Based LED Voltmeter

[Raza]

Hi Friends
I want to make a PIC 16F84 based LED voltmeter. Can any one help me on this with schematic and software for the same. Will appreciate an early help.

 

[bigdogguru]

The PIC16F84 is probably not the best choice for a voltmeter. It has no ADC internal features, therefore it will require an external ADC. It also has limited I/O and no serial bus features. So the ADC with have to pass the data in parallel 4,8 or 12 bits consuming the limited I/O pins which have to also drive the LED.

It can be done, but probably not the most cost effectively.
The PIC16F84 is also no longer supported by many of the newer chip programmers and debuggers.

What are the voltage type and range requirements?

 

[erio]

why using PIC for a voltmeter? its much easier using ICL7107 or ICL7135

here`s one using PIC
3 digits Digital volt meter
there`s already a thread here:
https://www.edaboard.com/threads/74101/

 

[Raza]

Thanks friends I got it solved with 16F676.

 

[sahu]

Thanks friends I got it solved with 16F676.

can u shear hear ?

 

[pnjbtr]

Here is pic16F72 based volt meter with 16*2 digit LCD.

hex=

:020000009C2939
:0400060000000800EE
:10000A00083083120313FC002330FD00FD0B0B287C
:06001A00FC0B0B2808009E
:10002000103083120313FD00FD0B1428000008009C
:1000300083120313CD1B1E2887121F2887164D1B02
:100040002328071224280716CD1A282887112928C3
:1000500087154D1A2D2807112E280715401832280C
:10006000071433280710871403208710CD193A2866
:1000700087123B2887164D193F280712402807167C
:10008000CD1844288711452887154D184928071190
:100090004A28071540184E2807144F2807108714C0
:1000A00003208710401C56280520572810200800E0
:0E00B000073083120313FD00FD0B5C280800CF
:0E00BE008312031344088A00430882000800DE
:1000CC008312031340104C08CD0018204014080074
:1000DC0083120313F801F9011030FC00710DF80DB7
:1000EC00F90D7408F8027508031C750FF902031852
:1000FC0086287408F80775080318750FF90703109C
:0A010C00F00DF10DFC0B7428080043
:100116009D28803083120313C800AE28C030C80063
:10012600AE289430C800AE28D430C800AE2880303F
:10013600C800AE284808013A03198C284808023A34
:10014600031991284808033A031994284808043AE1
:10015600031997289A284903F0004808F007700801
:10016600C80040147008CD00182040104A08CD0081
:06017600182040140800EF
:10017C00D028803083120313C800E128C030C80097
:10018C00E1289430C800E128D430C800E128803040
:10019C00C800E1284808013A0319BF284808023A68
:1001AC000319C4284808033A0319C7284808043A15
:1001BC000319CA28CD284903F0004808F007700835
:1001CC00C8007008CD0018204010CB014B084A071E
:1001DC00840000080319FA284B084A078400000819
:0C01EC00CC006620CB0AEC284014080070
:1001F800831203139F01C0309F044808F000F00DDC
:100208007010F00D7010F00D701070089F041F141E
:1002180058201F151F1D122900000E291F101E0827
:06022800F000F1010800E6
:10022E0083120313FB01FA01F9018030F800F10C7F
:10023E00F00C031C2B297408F90775080318750FA9
:10024E00FA070318FB0A0310F01F33297408FA0784
:10025E0075080318750FFB07FB0CFA0CF90CF80C5C
:10026E00031C1E297B08F3007A08F2007908F100BE
:06027E007808F000080002
:1002840083160313871007100711871107128712AB
:100294008312871007108712071287110711052090
:1002A40005200520871507158714032087100520CE
:1002B4008714032087100520871403208710052046
:1002C4000711871403208710052087140320871043
:1002D40087118716871403208710052087120715B6
:1002E4008714032087100711871403208710052023
:1002F400871403208710071587140320871005200F
:10030400071187140320871087160716871507150A
:0C03140087140320871005204014080007
:100320005F208A110A128000840AC30A0319C40AD2
:08033000F003031D90290800F1
:10033800353083120313A0002030A1002030A20022
:100348002030A3002030A4006530A5006430A6004A
:100358006130A7006230A8006F30A9006130AA00A0
:100368007230AB006430AC002E30AD006330AE00AC
:100378006F30AF006D30B0002030B1002030B200D7
:100388002030B300B4013030B5002E30B600303024
:10039800B7005630B8003D30B9004D30BA00413092
:1003A800BB004930BC004E30BD005330BE00BF0119
:1003B8009F0183169F0187012F308500422101305C
:1003C800CD0018200C30CD0018200130C8000130B5
:1003D800C9002130CA00BE200230C8000A30C90056
:1003E8005630CA008B200230C800FC207008C500B7
:1003F8007108C6000C30F4000030F50017217008B1
:10040800C1007108C2002008C700E830F4000330BA
:10041800F5006E203030F00747088400700880002F
:10042800200AC7006430F4000030F5004108F000ED
:100438004208F1006E200A30F4000030F5006E200A
:100448007808F0007908F1003030F0074708840098
:100458007008800002302007C7000A30F40000301E
:10046800F5004108F0004208F1006E200A30F4005F
:100478000030F5006E207808F0007908F10030307F
:10048800F00747088400700880000230C800053073
:10049800C9002008CA00BE208230FC00DD30FD0003
:1004A800FD0B542AFC0B542A00000000F7295B2A94
:02400E00590057
:00000001FF

DNS File for Proteus user.

 

[Raza]

pnjbtr,
Thanks a lot for the circuit, BUT I did not want LCD (I had this already) but the LEDs. Anyways that is solved long back. I may upload that here for others to be benefited.