I fabricated an Arduino Uno clone with an ATMega328P-PU chip.
Once done, i tried to burn the bootloader with an Arduino Mega.
I had a lot of problems but I think that finally the bootloader was uploaded correctly.
I did that as the following instructions:
2.Board=Arduino Mega, Programmer=Arduino as ISP, Port(COM)=OK.
3.Upload the ArduinoISP inside Arduino Mega.
4.Make the following conections (Mega-UNO): 50-D12, 51-D11, 52-D13, 10-Pin 1 of the ATMega328P-PU, Vcc-Vcc, Gnd-Gnd.
6.Burn the Bootloader.
*Some tutorials said that I should conect Pin 53 with Pin 1 of the ATMega328P-PU but I tried it and it didn't worked.
After that I tried to upload the Blink program. I was exited so I forgot to change the conections but the blink uploaded and worked. I could change the frequency few times but after that I've could never change the program (it is blinking wiyh a 1000ms delay).
Is the bootloader installed? (I think it is, because it is blinking).
How can I upload a new program? (I tested different conections and never works).
I would guess that you have over-written the bootloader when you uploaded blink in ISP mode. Have another try at installing the bootloader and then try using serial to upload a different sketch.
If you managed to upload a sketch without changing the wiring, then you will have no bootloader on the chip. In simple terms, when using "Arduino as ISP" with the correct wiring, you can upload a bootloader or a sketch.
I have just started with arduino I have an Arduino Uno Rev 3. It took several attempts to get the computer to acknowledge the board it finally did and allocated it to COM3 but when I Try Burn Bootloader I get the error meassage
avrdude: usbdev_open(): did not find any USB device "usb"
I am sure there is a simple fix but I can't find it
Processor is AMD A6-3670 APU with Radeon(tm) HD Graphics 2.70 Ghz
RAM is 8.00GB
System Type 64 bit Operating System
Operating Platform is Windows 7
I have an Arduino Uno Rev 3. ... but when I Try Burn Bootloader
If you have an Uno, you do not need to do "Burn Bootloader" (and you haven't described having any equipment that would allow you to burn the bootloader.) Just use "upload" to upload your sketch via COM3.
Thank you Westfw it was in software and I scanned the forum looking for guidance I found some posts saying that they had overwritten the bootloader and should reburn it, I will try a straight upload and see if things improve again Many Thanks