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Arduino Ammeter

Arduino Ammeter
Arduino Ammeter
Current measurement requires the use of an ammeter placed in series with the load. An ideal ammeter has no voltage drop; it is a short circuit. A good real ammeter must have a very small voltage drop in order not to alter the circuit under measurement with its insertion. The presented sensor has a voltage drop of only 50 mV. It has good accuracy and uses easily available components.
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Materials

Component list

Component List

Resistors

R1,R3 = 11 k, ±1% metal film

R2,R4 = 220 k, ±1% metal film

R5 = 11 k, ±2% metal film

R6 = 1 k, ±2% metal film

R7 = 10 k, ±5%

P1 = 500 Ω multi-turn trimmer

Rs = 0.1 Ω shunt

 

Capacitor

C1 = 10 µF, 25 V Aluminum electrolytic

 

Semiconductor

IC1 = Dual Opamp LM358

 

Others

Arduino Uno or Nano

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