retrolefty:
Now I have a gadget were the arduino is located and would like to upload sketches using the Uno board. Am I wrong or shouldn't this be possible by just removing the atmega from the uno board and connecting reset, tx,rx,+5,GND to the chip that is on the gadget.
I think this would be a pretty easy way to get the code into the gadget.
Yes, it is that simple and should work fine. Even simpler is to just plug a jumper wire between ground and the reset pin on your UNO. That will hold the chip in reset mode, but still leave the tx,rx,+5, and ground pins free to wire to your standalone UNO chip.
Lefty
From my experience you also need a jumper wire from the Uno board reset to the reset pin of the stand alone chip. So leaving the chip in with a jumper from between GND and reset wouldn't work. I take the chip off the board. But like I say ....... that's my experience! Maybe I'm just about to learn a simper way of doing this?
giantsfan3:
I'm thinking what you guys are describing is, e.g., the breadboard circuit in this tutorial (with arduino pin 10 to reset, and pins 11, 12, and 13 the serial programming pins) am I right?:
http://arduino.cc/en/Tutorial/ArduinoISP
No it's not.
It's more like this http://arduino.cc/en/Tutorial/ArduinoToBreadboard Look at the Uploading Using an Arduino Board section.
You take the Arduino as ISP to put the bootloader on the chip.
After the chip as a bootloader on it you don't need an ISP anymore (that's why you can put stuff on the chip on the Uno board without needing another board.)
So when you have an external chip with a bootloader. You put your sketch on it the same way you put it on your board. Except it's not ON the board, it's off the board with a couple of jumpers....so the Arduino IDE doesn't know it's off the board.......and it doesn't care!