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circuit diagram

Overview

kwp71scan circuit diagram

Parts

1 x Arduino Nano Every / Arduino Nano / Arduino UNO
1 x L9637D (driver with ISO 9141 interface)
1 x 16x2 LCD HD44780 or compatible with I2C LCD adapter
2 x 2N3940 transistor
1 x 1N4148 diode
2 x 4.7μF ceramic capacitor
2 x 100nF ceramic capacitor
2 x 1K Ohm resistor
2 x 510 Ohm resistor
1 x 470 Ohm resistor (Optional)
1 x LED (Optional)