Serial.print("010C\r"); // Send the "01 0C" command to the OBD-II adapter // Wait for a response from the OBD-II adapter delay(100); // Wait for 100 milliseconds to allow the OBD-II adapter to respond ...

Hardware Involved: Arduino Mega Development Board 3 LEDs (Red, Yellow, Green) Resistor 220 Ohms Resistor 10k Ohms Hall Effect Speed sensor ...

This Arduino based little digital tachometer was originally created for counting the speed of turntables and fidget spinners. There is another application to consider – a rear wheel tachometer for ...