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DIY 6.5MHz Arduino frequency meter with MAX7219 7segment Led module. Close. 4 2 24. Posted by 15 days ago. DIY 6.5MHz Arduino frequency meter with MAX7219 7segment ... Arduino frequency counter used in e-bike Watt meter. Examples with the frequency generated by the Arduino. You don't need a separate function generator to test the FreqPeriodCounter.Sep 27, 2020 · This is the modified circuit diagram. The max30100 pulse Oximeter sensor connection with the Arduino remain the same. This time I added a 16×2 LCD. As you can see, pin number 1 and pin number 16 are connected with the Arduino’s ground. Pin number 2 and pin number 15 are connected with the Arduino’s 5 volts.