Hey there, I am planning to make a birthday music cake with the function below :
I have 3 parts in the music cake :
1 -- > 7 LEDs as blinking circuit
2 --> 2 LEDs as candle to display flickering effect
3 -- > one speaker for music(happy birthday song)

So, I want to make it like this for the whole circuit :
1. Power ON -- > the blinking circuit start to blink with a pattern and 2 LEDs as candle will display flickering effect.
2. When a music button is pressed, the music played while the blinking still continue. Bear in mind that the music just play once when the music button is pressed.
3. when a pattern buttton is pressed, the pattern of the blinking 7 LEDs will changed.

Basically it is like this.

This is my programming code so far :
https://gist.github.com/f616cb648830ac7fa4c9

For one button control different pattern of blinking , below is the progrramming code :
https://gist.github.com/59e10280bfbe9fd9d9c8

I think I need tto use interrupt in this case for the music. Anyone can let me know how can I implement it ?

Thank you so much !

So, the minimum circuit for an arduino based development board is a 16MHz crystal and the 100nF cap for power supply and pull up resistor for RESET pin ?

No, you can use the internal oscilator (there is a fuse). And the reset is not required. The minimum is just the cap for the supply
[/quoteWhy the reset is not required ? Thought it needs to be pulled high for normal operation ?]

The minimum is just the cap for power supply ? Then how can I use the internal oscillator ? What setting should I change ?

So, the minimum circuit for an arduino based development board is a 16MHz crystal and the 100nF cap for power supply and pull up resistor for RESET pin ?

Ok, I face that problem too..Hahaha..reboot sometimes. Then what is the importance of the 22pF cap ?

What will happen if I did not put the 100nF cap and 22pF cap ?

Thank you

I did connected the Vcc to AVcc..Just that I do not put a 100nF cap in between the Vcc and GND ><

why is it needed ?

Hey I just constructed a circuit where I solder a 28 pins socket and one 16MHz crystal for the circuit. I put a pull up resistor at the pin 1 too. Weird things happen is that my program sometimes work sometimes not working. Sometimes it loop for once .. Any problem ? Is it because I did not insert 2 cap at the crystal side ?

Thank you

Actually, what is the purpose of burning bootloader ? Cant I just use a normal AVR chip then I used the FTDI programmer to upload the code into the chip using arduino IDE ??

Hey there, want to ask. Atmega 8, 168 and 328 is the official arduino and clones. What does this means actually ? Means the arduino IDE have the bootloader to burn these AVR chip so can be programmed using arduino IDE ? How about others AVR chip lioa atmega 32 ??

Thank you.

p/s I am still very blur ><

different bootloader means ? Normally in UNO is UNO bootloader ?

I mean in general when I power up my arduino, the LED connected to the pin 13 of arduino UNO will blink a while right then it only runs the code ?

Hey guys, I have made my own arduino recently.

Want to ask something, in original UNO R3, when I powered it up using 9V battery, the LED at pin 13 will blink awhile right ?

However, for my own DIY board, it does not blink.

What I want to ask is that, why the LED at pin 13 will blink ? If never blink indicates what ?

FYI, I still can upload code from arduino IDE into my DDIY arduino board.

Thank you for help

so if it say no key is pressed, so it print nothing？