Current sensing problem

Discussion in 'General Electronics Chat' started by kamaleipl, Jul 21, 2009.

  1. kamaleipl

    Thread Starter New Member

    Jul 21, 2009
    Hi All,

    I am working on a master slave one wire project(on a 24V DC line,1 master and many slaves devices), as a part of my application i am measuring the current of the total loop(all slaves). I put a resistor of 1 ohm and measuring the voltage across that resistor. The slave modules are approximately of 10mA current consumption. what i am doing is, adding one by one slave to the loop and measuring the voltage across the resistor.

    while doing so what i have observed is that the difference in the voltage across the resistor while adding a new slave is very less (around 20mV). I want to increase this voltage difference (across the resistor for each new slave) to more than 70mV.

    Please somebody suggest some idea to achieve this.

  2. SgtWookie


    Jul 17, 2007
    Increase the resistor to 7 Ohms.