I followed this ArduinoToBreadboard and I just added a 5V regulator just to be on the safe side.

So my questions are:

  1. When I connect a Nokia LCD 5110 to the DIY arduino, nothing really happens but when I take out the AtMega328P-PU chip and place it to the official arduino board the screen works normally, why does this happen? (The pins are connected on the same way, it is not this kind of problem)
  2. How can I make this DIY arduino to work with a 3.7V Li-op battery? Because the DIY board works only when I power it up with 5 or more Voltage it works perfect, so any ideas?
  • 2
    What did you set the BOD fuses to? – Ignacio Vazquez-Abrams Sep 1 '16 at 16:22
  • 3
    Instead of showing us something that you based your setup on, why not show us your actual setup so we can see what you can see? As this question stands it's unanswerable. – Majenko Sep 1 '16 at 17:30
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    Start simple. Make your custom board blink an LED in a unique pattern or on a different pin than default, or say hello on the serial - prove that it runs your code at all before you worry about something as complex as an LCD interface. – Chris Stratton Sep 1 '16 at 18:03
  • For 2 you may consider a voltage booster type circuit that takes the input of 3.7 volts – qwerty10 Sep 2 '16 at 4:23
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    That would be a quite mistaken conclusion. But this is not a valid question for the site, without showing full detail of your exact setup, and the fully specific test your are running which fails. – Chris Stratton Sep 3 '16 at 14:26

So. You say you have build an Arduino on a breadboard, is that right?

  1. Have you checked all the pins, so they are all connected up properly? Can you post some pictures of the protoboard? Maybe you missed something, didn't connect all GND pins to each other if there are more on the arduino or something.

  2. You can power the Arduino using a 3.7 Lion or Lipol battery using a boost-converter, here is a great video explaining how you can build your own (https://www.youtube.com/watch?v=QnUhjnbZ0T8), or you can just order one from Ebay.

Great Scott (the author of the video) also made a video on how to create a standalone Arduino: https://www.youtube.com/watch?v=J3DYgzRvLT8 . Check the videos out! Hope I helped you.

  • Well, I had checked Great Scott's video before but the size of the boost-converter that he is making is way much bigger than the size of my project, about the arduino circuit it's the exact same! – DrunkProgrammer Sep 3 '16 at 14:32

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