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Topic: Burning Code in a DIY Arduino (Read 2 times) previous topic - next topic

Nick Gammon

Let's not get bogged down here. Possibly that line could be omitted, but if you make a stand-alone version (without the USB chip) then you would need it.

Vincent19


Xenobius

Yes this only makes sense when using USBtinyISP.
I need to learn more on SPI... Actually I have difficulty making a distinction from

UART - This is a Tx -> Rx & Rx -> Tx single device connection right?
I2C - As for as I know, this is a 2 wire protocol which can accept a maximum of 255 channels and any device connected to the same channel gets the message sent
SPI - As for SPI, I will try to see the link but so far I have no clue ! :)

Cheers

Xenobius

I am too asking questions to learn. I do have a small project (a 16 relay board with 2 pots connected to ADC and 4 buttons) and am trying to design the board from scratch without the usb connection and without the usb-to-serial-ftd-chip.


Nick Gammon


I2C - As for as I know, this is a 2 wire protocol which can accept a maximum of 255 channels and any device connected to the same channel gets the message sent


No. Better read this:

http://www.gammon.com.au/i2c
http://www.gammon.com.au/spi

http://www.gammon.com.au/forum/?id=10918

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