In Progress

Adding voltmeter / ammeter to PIC microcontroller

We have an existing PIC18F258 microcontroller and need to add a high voltage voltmeter and ammeter inputs. We are looking for a company or individual to design the circuitry. The voltmeter must be able to accurately measure up to 400v. The ammeter must measure between 0 and 30 amps of current at 30 kHz AC, ideally through a current transformer (though we would be open to other methods so long as it is electrically isolated.)

Requirements

[url removed, login to view] voltage sensing circuitry must measure from 0 – 400 VDC

[url removed, login to view] voltage sensing circuitry must have an accuracy / resolution of no less than 350 mV across the entire voltage range.

[url removed, login to view] voltage sensing circuitry must maintain the accuracy across a temperature range of at least -40C to 80C

[url removed, login to view] voltage sensing circuitry must have a specified working temperature range of at least -40C to 80C

[url removed, login to view] voltage sensing circuitry must have a safety such that any single component failure will not lead to the PIC microcontroller being exposed to high voltage.

[url removed, login to view] ammeter circuitry must have a specified working temperature range of at least -40C to 80C

[url removed, login to view] ammeter circuitry must be compatible with AC at 30kHz (for use in an isolated full bridge SMPS.)

[url removed, login to view] ammeter circuitry must have an accuracy / resolution to measure within 250mA.

[url removed, login to view] circuits must be able to operate in a high noise environment.

What we expect:

1.)Schematics for voltmeter and ammeter circuits

2.)Part numbers and specs for all components including current transformer. (exception: we do not need part numbers for standard 5% resistors, only values)

3.)Sample microcontroller code in C/C++ for data acquisition routines including any necessary calculations (pseudo code is acceptable)

4.)We will own the rights to the circuitry

5.)The project must be completed within 10 days after the project is awarded.

Payment will be place in an escrow account and released when the project is finished.

Skills: Electronics

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About the Employer:
( 11 reviews ) Carol Stream, United States

Project ID: #251355

Awarded to:

diditgi

Details sent as a PM

$375 USD in 10 days
(2 Reviews)
5.0

10 freelancers are bidding on average $342 for this job

Yorkdale

Please see the PM. Thanks.

$375 USD in 10 days
(4 Reviews)
5.0
mapyn

Hello, We are an Electronic Design House based in Pune, India specializing in Prototype Projects and Design Documentation. We have a strong technical team that specializes in Embedded Hardware , Firmware and PC Based More

$310 USD in 10 days
(3 Reviews)
4.7
adipdutt

Will need existing board schematic, if selected. As a designer of railway protection system we have good knowledge of component failure and temperature range accuracy.

$360 USD in 10 days
(3 Reviews)
3.0
Sollec

please see PMB

$375 USD in 30 days
(1 Review)
1.4
manielec28

i can finish ur project as early as possible. its my maximum period

$350 USD in 9 days
(0 Reviews)
0.0
rabbit9286

i will do it

$350 USD in 10 days
(0 Reviews)
0.0
masterpc

Ready to work

$325 USD in 10 days
(0 Reviews)
0.0
adnanahmmad

I have designed 6 phase volt meter for 0-300V at 50Hz and ampMeter fot CT 3 phase and 1 chennel for ground neutral voltage measurement. Over under current and voltage protection is avaialble with realy opration. This b More

$300 USD in 15 days
(0 Reviews)
0.0
pabasarak

we have done similar project with PIC16f877. we have all the resources to do SM PCB layout, fabricate and write firmware

$300 USD in 45 days
(0 Reviews)
0.0