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  • ArduAmmeter about 2 years ago

    1) the Arduino AREF pin is an input only in the "EXTERNAL" case, otherwise it is an output of the internal Vref.
    2) The voltage follower serves to not alter the value of the R4 resistor as it has an output with negligible resistance.

  • Smart Buoy - [Summary] over 2 years ago

    For several years I measured the waves of the sea and also the motions of the ship using professional buoys to measure the height of the waves and the prevailing direction of the sea. I also know the sensors used on buoys and electronic circuits and radio communication systems and satellite positioning systems.
    If you need help I am happy to cooperate.

  • DIY Voltmeter Using Arduino and Smartphone over 2 years ago

    interesting project, especially with regards to software. As for the hardware part, I suggest you use the internal Vref, which is fairly stable and is about 1.1V with the following instruction in the setup ():
    analogReference (INTERNAL);
    If you want a range of 50 volts, you must use a divider with R1 = 1Mohm and R2 = 22kohm, metal film resistors with a tolerance of +/- 1%. (or 100k and 2.2k)
    It would also be advisable to measure the Vref with a good digital voltmeter, after loading the program and configuring the Arduino ADC. Then enter the true value of Vref in the program as it can vary between 1 and 1.2V. Best regards

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