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No. At least not without already having some Arduino compatible or otherwise UART capable bootloader being programmed into the Tiny85. So you need an ISP programmer anyway to program anything you want …

The IO pin has absolute maximum rating of 40mA. The digital output voltage rating is listed at 10mA current, which basically tells the drive strength. But pins are not guaranteed to source current gre …

Yes there are many problems. I will only focus on one in my answer, as most of them are mentioned already and are either very small technical issues or simply they should be drawn in another way. The …

Yes, you do need a capacitor. Don't replicate mistakes of other beginners and leave them out just because they leave them out. It may not be mentioned in the datasheet, because a datasheet may only co …

The only explanation is that there is some other piece of code which writes to PORTB. So the problem is not in the interrupt code. If the other code does a read-modify-write operation to any unrelated …

No. For many reasons. It's just wrong, against MIDI standard, breaks isolation which allows for ground loops and would not even provide much power. If you say but other people use it too, well, they s …

No it has no effect other than spending time printing those status strings.

1) USB is not compatible with serial communications 2) USB is 3.3V levels so connecting 5V serial comms will kill your phone 3) 100mA without enumerating USB, maybe 500mA after requesting it.

As it is now, it prevents back-feeding the 5V to PC. Whether that is the intention or not, is unknown. Most likely it is an error in the schematic as that device is supposed to be USB-powered. That ci …

The protocol is pretty forgiving. It can run between 20 and 600 kbps, where 1 bit means either 1 or 2 pulses. The pulse high time just need to be at least 14ns in length and there must be at least 14n …

The analog and digital pin numbers are not the same. PB3 is analog pin 3, that's why it works. PB2 is analog pin 1. PB4 is analog pin 2.

An interrupt every 500us is a rate of 2 kHz. As you have only a limites set of prescalers available and the resolution of the timer is only 8 bits, you can't use it without prescaler, and the next pre …

In short, there is no cap to cut parts and cost, because mostly the board can work without it. It slightly depends on which exact 78M05 that is and which manufacturer datasheet you are reading. Even i …

Yes, possible. Problem what you now have may be that the pusbutton does wake the MCU, but depending on your clock source, it may take so long to wake up that the pushbutton is already released when MC …

The ATTiny and the LED strip does not have supply voltage, so it won't work. For some reason there is a capacitor between Tiny VCC and LED VCC pins. Pulling D- to VBUS which is 5V is too much. It shou …