Measuring Resistor Resistance with Microcontroller

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Below is a list of recommended components along with links that you can add to your Flux project for a low-value resistor measurement circuit using a 3.3V microcontroller:

Table

Component TypePart & LinkDetails
Instrumentation AmplifierINA333Precision, low-offset amplifier for accurately sensing the small voltage drop across the resistor.
Precision Op-Amp (for current source feedback, if needed)OPA333Rail-to-rail, ultra-low offset op amp for implementing a stable constant current source with low-voltage operation.
N-Channel MOSFET (optional, for current control)AO3400ALow R_DS(on) MOSFET suitable for precision current driving circuits using a feedback loop.
Precision Sense ResistorR1A low-value resistor (e.g., 1Ω–10Ω, 1% tolerance) to set the constant current and act as the measurement element.
Decoupling CapacitorC1A 0.1µF capacitor for the op amp’s supply decoupling to ensure stable operation.
These components let you generate a known constant current through the resistor and then amplify the low differential voltage (using the instrumentation amplifier) so your microcontroller’s ADC can measure it accurately.
Would you like more detailed guidance on incorporating these components into your schematic within Flux?
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