3 Digital RPM Meter Using Arduino Report - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Figure no 3.2:-Schematic Diagram of 741c. NOTE 2: Tachometers with two or three buttons use an advanced microcontroller circuit to measure engine RPM for increased accuracy and zero pointer flutter atDIGITAL RPM METER SCHEMATIC datasheet, cross reference, circuit and application notes in pdf format. If you connect the red & brown wiring in parallel will cause the meter You could get the RPM wire information from the service manual of your bikes.). Fig.2: Schematic Diagram of 741c. Here in our circuit we use this device to convert the analog voltage signal into digital voltage signal. * OUT1/OUT2 can be switched during output allocation. Block Diagram. Input Circuits. Count and Hold Inputs. 6 7. 8. 9. The sensor side of the switch has an X on it and is located on the opposite side of the switch from the wiring cable. Refer to the top view diagram below. The