Connecting TDS meter with Arduino

Projects General Guidance
1

Hello everyone (my English is weak, please forgive me for any English mistake)

I am doing my project based on IoT in which i am making the use of IoT in RO plant.
I want to connect a TDS meter to the arduino through PGA(programmable gain amplifier )
but i dont know how to connect and how much gain i have to set for this.

I am using

  1. TDS Indicating Controller - Micro TDS 18 - ( TDS - Total Dissolved Solids ) , which will give 4-20 mA
    output
  2. MCP6S28 (programmable gain amplifier)
  3. Arduino mega 2560
2

Why extra hardware for a 4-20mA sensor.
A simple resistor is enough to measure that current.
About 125ohm is the best value for a Mega's internal 2.56volt Aref.
This post might give you some ideas.
Leo..

3

No actually i want to connect more sensors like PH ,temperature, load cell.
and i think load cell and temperature sensor need amplification.

4

Lucky92:
No actually i want to connect more sensors like PH ,temperature, load cell.
and i think load cell and temperature sensor need amplification.

PH will have its own amplifier, I hope.
Temperature and loadcell each need special amplifiers.
What will your temperature sensor be, RTD,PT100, K-Type?
Can you please tell us your electronics, programming, Arduino, hardware experience?
Thanks.. Tom... :slight_smile: