This is a Merge of two codes in one, the original VU Metter I2C display with 10 leds VU Metter. The original code is named OLED_Metter The second code was the Arduino.cc exemple of barGraph Some ajusts are maded in ledLevel mapping as below: // map the result to a range from 0 to the number of LEDs: int ledLevel = map(sensorReading, 50, 400, 0, ledCount); The original was: // map the result to a range from 0 to the number of LEDs: int ledLevel = map(sensorReading, 0, 1023, 0, ledCount); For the display the sample window was changed to to the response of the needle sincronize with the leds (The original is 50ms) const int sampleWindow = 30; // sample window width in mS (50 mS = 20Hz)