Arduino Measures Current from Constant Current Source
by Lewis Loflin
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Open above schematic. Schematic Arduino Current Measurement.
This is a continuing series on Arduino projects. This circuit enables Arduino to measure current from the constant current source projects below.
Also see Arduino Controlled Power Constant Current Source.
I used two parallel 0.5 Ohm resistors for 0.25 Ohms. The small voltage from resistors is amplified by an LM358 op-amp. Gain is set by R2 / R1.
An RC filter of 4.7K resistor and 10uF capacitor enable measurement of DC current or pule-width-modulated current from Arduino PWM from digital pin 9.
The test program for an I2C LCD display and serial monitor.
Download code ccs_lm358.txt.
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