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Different type of shunt resister are available in market like 100A/50ma, 100A 100ma etc. You can chose one from these. Basically your controller cannot measure a precise millivolt (A 10 bit ADC can measure 0.0048v minimum), you will gain the shunt voltage by amplifier for more flexibility. Many of types amplifiers are available also (LM339, LM324 OP07........). For example you chose a 100A/100mv shunt rasister and want to see value in decimal value... if you want to go maximum 5v. You chose a amplifier witch can gain input 50 times.