How To Measure Resistance Using Microcontroller

As per the title name i am looking to measure current with microcontroller. For controling power i am using arduino pwm that controls voltage and by ohms law i am calculating desired power.

Arduino Ohm Meter

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Age proportional to the unknown resistance.

How to measure resistance using microcontroller. You can use this circuit to measure resistancesjust start by identifying the range of resistances to measure. Measure the voltage on the high side of the resistor with an adc. To measure the resistance of a component disconnect it from a circuit.

In my case i found the measured voltage and current values to be 241 mv and 843 ma respectively. The stepper motor has a coil with a resistance of 50 w 15 which ranges from 425 w to 575 w. Measure the voltage at the center of the divider with adc.

Digital ohmmeter is used to measure resistance of any resistance or any circuit. Pic16f877a microcontroller is used in this project to measure resistance by doing signal conditioning of measured resistance. I am creating circuit that will control power of heater coil.

Heater coil is low resistance 03r 2r and resistance can vary with coil replacing. Make a voltage divider consisting of the variable resistor sensor and a fixed resistor. Lcd is used to display resistance value.

Resistor in series with the coil resistance rs and supply a 5v power as shown below. Conversely the cables copper conductor has low resistance facilitating current flow. The value in ohms tells you how strongly a component will resist current.

Next measure the voltage across rs and current through it separately using the multimeter. Heres a couple of pic friendly methods for resistance measurement. Run constant current through the sensor.

Many have an ac dc button but some have ac options on the selection dial. Now the problem is next. My basic understanding of how to measure current with microcontroller is that you use a shunt resistor in line of the load and measure the voltage across the shunt.

Most simple electronic circuits use dc power but meters can measure ac too. The higher the resistance the lower the current flow. Microcontroller measure resistance in circuit.

I used the voltage divider and i can get the resistance values alsobut when i tired to find the low values like 1 ohm like means it cant showing the values. Measuring resistance value by using pic controller hai friendsi like to read the resistance value by using the pic controller. Next define the scale measurement or digital value within the microcontroller.

Insulation used for cables has a very high resistance impeding current flow. Proper resistance is critical. The resistance can also be measured using ohms law.

Fig4 flow chart of resistance measurement resistance opposes the flow of current. It can measure resistance between 0 1mw with precision of 5 percent.