Practical resistance measuring tool: DIY Arduino millioMey is used to measure low resistance resistance

It is difficult to measure low resistance with standard multimeter. The device solves this problem that can be used to accurately measure small resistors in the range of 0.1 OHM to 50 ohm. It is very simple to make, including the following components: -ARDUINO NANO microcontroller -16x2 LCD display -LM317 regulator - potentiometer - 12 ohms with resistors It consists of 100mamp constant current source. The constant current source is built using the LM317: Iconst = VREF / R where: LM317 VREF is 1.25V Iconst = 1.25 / r Iconst = 104mamp The pressure drop on both ends of the resistor having a constant current can be obtained (R = V / I), where: I = 100mamp, because we use 100mamp constant current source V = measured by Arduino When 50 * 100mA = greater than 5V, this code and circuit are not suitable for values ​​greater than 50 ohms. The accuracy of this millian table is satisfactory, depending on the accuracy of 12 ohmic resistors and 5 volts stable voltage. Finally, place the device in a suitable box, which is another useful tool in the laboratory.

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