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1  Using Arduino / Microcontrollers / Re: Bootloading error: Invalid signature (0x000000) on: October 20, 2012, 10:05:31 pm
It's working now. I'm not entirely sure what the problem was, I just removed the circuit from the breadboard and rebuilt it. Also I ditched the Arduino IDE, downloaded optiboot hex files and used avrdude in terminal. They both work perfectly now in my Uno.
2  Using Arduino / Microcontrollers / Bootloading error: Invalid signature (0x000000) on: October 20, 2012, 01:20:48 pm
I'm trying to burn a bootloader on to two new Atmega328p chips I recently bought. I always get an invalid signature error.
In a terminal window I write: (I know this isn't for actually burning the bootloader)
avrdude -c usbtiny -p m328p -v -F
and I get:
Programmer Type : USBtiny
         Description     : USBtiny simple USB programmer,
avrdude: programmer operation not supported

avrdude: Using SCK period of 10 usec
avrdude: initialization failed, rc=-1
avrdude: AVR device initialized and ready to accept instructions
avrdude: Device signature = 0x000000
avrdude: Yikes!  Invalid device signature.
avrdude: Expected signature for ATMEGA328P is 1E 95 0F

I have also tried using Arduino as ISP with the same results.

Before I tried burning the bootloader to the chip using the Arduino IDE (programmer set to USBtiny) I wrote the line above in a terminal window and it read the fuse bits successfully.
Did I brick my atmega chips?

3  Community / Exhibition / Gallery / Guitar step sequencer on: May 22, 2012, 09:45:48 am
My first post here. I'm relatively new to the Arduino environment but yesterday I made my first project where from start to finish I did everything myself. It's a simple guitar "effect". Instead of describing what it does, here is a video. I didn't technically use an arduino as you can see, but it's written in arduino code.

All I'm doing is writing HIGH to the base of 2N2222 transistor (which grounds the hot wire of the audio cable) and then LOW with a delay between them and a pot to control the delay.
While that's cool and all I thought the next step would be a step sequencer where I control the volume of each step (with pots). What I need help with is... How can I control the volume? I looked at digital potentiometers with SPI interfaces but potentiometers in passive guitars are normally 250-500k and I couldn't find any digital pots like that. Any suggestions?
Also, is it bad to ground the teensy and guitar/amp together?

Thanks smiley
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