Only Three Pins for a 4x3 Keypad

Project tutorial by Giovanni Carrera

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  • 1 comment
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An Isolated Analog Input for Arduino

Project tutorial by Giovanni Carrera

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A very simple way to power Arduino

by Giovanni Carrera

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  • How to modify analog output range of Arduino Due 9 days ago

    Hi, 800 mV are too many, with that type of operational amplifier the zero can be of some tens of mV. Have you tried to adjust the Rp trimmer? Read also the answers I gave to the previous questions. With the addition of a negative power supply the zero problem is eliminated.
    To measure the curves of semiconductors I would recommend my project "A bipolar analog I / O for Arduino Due" found in my blog ardupiclab.blogspot.com.

  • How to modify analog output range of Arduino Due 16 days ago

    Hi,
    a noise of about 300 mVpp is unacceptable. The causes could be multiple and I don't have enough information for a diagnosis. Try to measure voltages in various points and power supplies. Avoid long wires and check grounding. An oscilloscope would be very useful.

  • Only Three Pins for a 4x3 Keypad 3 months ago

    You will find more details and also other examples of keypads in my blog: ardupiclab.blogspot.com

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