Components
Tools, APP Software Used etc.
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KiCADKicad
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arduino IDEArduino
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Description
Ultra-precise milliOhm meter
In this project I made a precise milliOhm meter, based on some circuit designs first published by Scullcom Hobby Electronics. I followed his circuit designs, then I designed my own PCB and developed a little code for an Arduino Nano.
The milliOhm meter uses a very simple principle: Ohm's law. We apply a know current (100 mA) on an unknown resistor, and we measure the voltage across the resistor. The know current and the measured voltage will tell us the resistance. The measurement is also known as 4-wire sensing or Kelvin sensing. The voltage measured by the AD converter is processed by an Arduino Nano and the data is sent to an OLED display as well as to the serial port.
Some tips:
Pay special attention to the polarity of the following components:
- All tantalum capacitors are polarized, so double check C2-C5, C8 and C9.
- LTC2400 and LT1634 don't have notches. The pin 1 is located where their numbering starts. Always double check this!
- The maximum resistance that you can measure is 5 Ohms. Don't go above this value, otherwise, you can damage the ADC!
Part list:
Actives:
- U1: LM2940-CS5.0
- U2: LT1634
- U3: LT3092
- U4: MAX680
- U5: INA106
- U6: LTC2400
- U7: ADR4540
Passives:
- R1-R7 and R9: 100R (0.1%) - R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm
- R8: 56R (0.1%) - R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm
- R10: 10R (0.1%) - R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm
- R11: 499k (0.1%) - R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm
- RV1: 100R - 3386P
- RV2: 100k - 3386P
- C1: 220 uF (electrolytic - d6.3, p2.5)
- C2-C5: 4.7 uF (tantalum - 3528)
- C6, C7, C10: 100 nF (ceramic - 0603)
- C8: 3.3 uF (tantalum - 3216)
- C9: 10 uF (tantalum - 3528)
Code
Arduino source code
https://curiousscientist.tech/blog/ultra-precise-milliohm-meter-part2
Schematic and Layout
Schematics
milliOhmmeter_Schematics_CS.pdf
Jan 18,2022
6,118 views
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Ultra-precise milliOhm meter
2 Layers PCB 72 x 78 mm FR-4, 1.6 mm, 1, HASL with lead, White Solder Mask, Black silkscreen
A high-precision milliOhm meter with a precision current source and a high-resolution AD-converter.
6118
13
5
Published: Jan 18,2022
BOM(Bill of materials)
PCBWay Donate 10% cost To Author
File Last Updated: 2023/03/09 (GMT+8)
File update record
2023-03-0909:30:51
Parts List (BOM) is updated.
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