Smart Alternator Test kit. Home made with an Arduino.

I made this to test my friends Subaru Impreza Alternator. It has a smart alternator which can sometimes not charge the battery. Next video will hopefully show the testing of the alternator. Just waiting for back bearings to arrive. The ECU can sometimes send a no charge signal. If you cut the C wire I think it goes back to an normal alternator charging at 14.2 volt. Check before doing that. I might be wrong.

[@damianbutterworth2434]

It works. I`ve tested it on an alternator and it even worked on a low frequency. Went from 12.4 volts to 15.5 volts when I adjusted to duty cycle knob.

[@damianbutterworth2434]

Only use a 12 volt supply to the test kit. Don`t use the car battery since it can go over 12 when testing.

[@damianbutterworth2434]

here is the video of the tester working on a Subaru Impreza Alternator I repaired. Fast Forward to 1 hour 12 minutes.
ruclips.net/video/DakbQyfLEko/видео.html

[@damianbutterworth2434]

int f = 0;
int d = 0;
float dd = 0;
float ff = 0;
int l = 0;
void setup() {
}
void loop() {
int f = analogRead(A0);
int d = analogRead(A1);
dd=d;
ff=f;
dd=(ff/1023)*dd;

// WAVE GENERATOR
for (int i = 0; i = dd){l=0;}
if(i = dd){digitalWrite(9, HIGH);}
if(i