Hi

I have Atmega328 microcontroller as on this schematic.
I am not very experienced with micro controllers. I would like to know how I could program those instructions in AVR programming language:
If pushbutton is pressed
-output of pin1 = 3V
-output of pin2 = 0V
Also, I would like to know which pins from the attached schematic should I use for that: analog, digital or other type?

Thank you

 

You need some kind of editor software in which to write the program in some programming language (which you will have to learn), a compiler to make the program into something the processor can understand, software to send the program to the processor, hardware to program the processor, and a lot more knowledge of the processor than you do now.

Can I suggest that you start with an Arduino. There is a free integrated development environment (IDE) and all you need to program the Arduino is a USB cable. The IDE comes with example programs to blink LEDs, read buttons and so on.
https://www.arduino.cc/

 

Kind of hard to get 3 volt output the pin is going to be the supply voltage. So if that's 5 volts you get five volts now you could run slower clock and the chip at 3 volts.
If you mean with pwm the output is still supply voltage it's just toggled to make it look lower.
But without a filter your not going to have a true 3 volt output.
You need a chip with DAC

 

Maybe you should tell us more about what you are trying to do. Are you taking a class? Is this part of a project? Or are you just curious and want to learn about microcontrollers?

 

You can use bi-directional logic level translator from 5V-3.3V like this..



Allen

 

Kind of hard to get 3 volt output the pin is going to be the supply voltage. So if that's 5 volts you get five volts now you could run slower clock and the chip at 3 volts.
If you mean with pwm the output is still supply voltage it's just toggled to make it look lower.
But without a filter your not going to have a true 3 volt output.
You need a chip with DAC

Or just a potential divider to reduce the 5V from the pin to 3V.

 

output of pin1 = 3V
Don't think he had divider or a buffer in mind.
More like something where he gets 3 volts.
I was just pointing out a 5 volt avr atmega like his doesn't have that.
Lots of ways to get it done .