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Is it necessary to put a diode on the 3.3V output? No. The regulator output will draw a few mA when voltage is back-fed into it from the USBASP, but this won't harm it. However it could damaged if there is a large amount of uncharged input filter capacitance. To prevent this you should disconnect the power supply unit when programming, and only have a ...


I'm not entirely sure, but I think your 24V somehow ended up in the Arduino. I would place the 24V rail and the 5V rail on opposite sides, that's why your breadboard should have one rail on each side. Sometimes they even come with 4 rails, indicated with a small gap in the lines on the side rails. Technical schematics often use + and minus opposite to the ...


If I use this 3.7V battery, will this work well? The actual voltage of the battery will decrease from 4.2 V to 3.3 V, as the battery slowly goes from fully charged to fully discharged. The atmega328 accepts between 1.8 and 5.5 V power, so it will work under the full range of voltage from the battery without voltage regulation. Note however that the full 1....


Every micro-controller has a data sheet that mentions 'Electrical Characteristics'. As per Atmega 328 data sheet, Vcc can be of range \$2.7 - 5.5V\$

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