Conductivity Measurement - Microcontroller

We are looking for design of a circuit which will return a value between 0 and 5v DC which corresponds to the resistance of liquid(milk). The circuit has source voltage of 5vDC and can be designed to output a PWM signal if needed.

The probes are stainless steel spaced 1cm apart and will be used in apparatus to measure the milk flow coming from cows on dairy facilities. For this reason several electrical characteristics must be taken into account. Cows are very sensitive to stray current so research will need to be conducted to ensure that the circuit measuring the flow of milk will not produce voltage or current that could harm the cow.

We would like the components to be simple and affordable as it will effect the base cost of the unit we are developing. Schematics will need to be provided as well as a description of how the circuit will work.

In summary:

a. Measure conductivity(resistance) of milk

b. Do so without harm to the animal

c. Circuit will return a value between 0-5vDC

- This range will correspond to a resistance reading between 0 and 5k ohms

d. Source voltage on circuit cannot exceed 5vDC

- We can provide a PWM signal if needed

e. Design needs to be simple and affordable

f. Probes on metering device is 1cm apart and stainless steel

g. Voltage used to measure cannot be DC as this will corrode the probes in liquid

e. Schematics and description of operation must be submitted

f. We are already using a microcontroller which will read the input of the circuit provided.

Skills: Electrical Engineering, Electronics, Engineering, Microcontroller

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About the Employer:
( 5 reviews ) Lake City, United States

Project ID: #596538

Awarded to:


We can do this conductivity measurement meter using ATMEL AVR low cost microcontroller. Please see you PM for more details Regards Somasundaram.I

$1500 USD in 15 days
(1 Review)

18 freelancers are bidding on average $371 for this job


Details sent as a PM.

$499 USD in 7 days
(2 Reviews)

I am professional automation engineer with more than 30 years of experience. Completed many projects. Will like to have weekly communication of work progress. After 30 days, submission of the circuit diagram will More

$600 USD in 75 days
(25 Reviews)

Hi, As an electrical functional and ICT test machines designer this is a simple job. If you want I can provide schematic, microcontroller SW and PCB design too. Just I have a question, at which accuracy do you want More

$200 USD in 3 days
(2 Reviews)

Hello. I have extensive experiance on embedded systems for use in Analytical laboratories and Test & Measurment instruments. Please see PMB. Regards... Zeeshan A. Noorwala

$460 USD in 20 days
(3 Reviews)

We are already measuring liquid conductivities,TDS,also various parameters using capaciive probe. We will be converting your PWB signal to bi-polar,scaling function can be given o your uC. regards adipdutt More

$400 USD in 14 days
(4 Reviews)

I have done same type of project to detect levels of the water using resistance [login to view URL] you can dedicate one analog port from your microcontroller this is simple. I want exact reading or reading range of the res More

$30 USD in 2 days
(2 Reviews)

I will give support and build the proto-type for you. I may even have schematics on a unit that can already do this for you. I have many proto-type you can see just a few of them here: [login to view URL] More

$175 USD in 14 days
(0 Reviews)

You give 50% PWM on resistor devider sch(and inverting signal to other side of devider) and measure the voltage with differential amplifier. That's idea for free. For working prototype - 50$.

$50 USD in 7 days
(0 Reviews)

I'm an electronics hobbyist. I'm rather good in this kind of analog circuit. to avoid harming cows an insulation have to be made between the circuit and the stainless steel electrodes and / or between the circuit an More

$180 USD in 20 days
(0 Reviews)

See details in MB.

$150 USD in 15 days
(3 Reviews)

we can do it

$30 USD in 0 days
(1 Review)

Dear project creator, Please see my PM. Regards Gergely Kún

$250 USD in 7 days
(0 Reviews)

Hello, I am a practicing Electronics Engineer with over 10+ experience with analog sensor and signal circuit design primarily in the Aerospace industry. I propose that passive resistance measurement would be achiev More

$150 USD in 20 days
(0 Reviews)

I have 5 years of experience with microcontrollers and embedded systems. I can start working on it.

$30 USD in 10 days
(0 Reviews)

Sir please me the details so that I may know how to do your project. Hope to with you on this.

$200 USD in 10 days
(0 Reviews)

Hi Please check PM. Best Regards

$2000 USD in 30 days
(0 Reviews)

Hi Please check PM. Regards

$250 USD in 0 days
(3 Reviews)

Hi there! Don't get me wrong, it's just a dummy bid. You can get a lot more information about milk if you use AD5933 to measure complex impedance at some frequencies, not only DC.

$30 USD in 60 days
(0 Reviews)