What is it?

This cable allows writing firmware to an AVR microcontroller that uses UPDI, such as the new 0-series and 1-series ATtiny, or 0-series ATmega chips. It uses a USB-UART chip, using the one-wire scheme, which connects RX directly to the target UPDI, and TX via a 4.7k resistor.

Note that the cable itself may be white or black, depending on available stock.

How to use it

In order to use this programmer you will need to use one of the following tools for actually writing firmware files to AVR chips:

• Device::AVR::UPDI
• pyupdi

For example, if you install the first one that will give you a new command, avr-updi. You can write an ATtiny814 chip from a file called firmware.hex with the command

$ avr-updi write-flash -p t814 firmware.hex

Why did you make it?

I needed a cable like this for developing on the ATtiny814, using my new development board.

What makes it special?

Besides this cable, there don't appear to be any maker-oriented UPDI programming products. This cable allows easy use of UPDI to write firmware onto AVR chips.

Related Products

• AVR UPDI Programmer with 12V A USB UPDI programmer with a second serial port and 12V pulse generator

• ATtiny3217 Development Board A development board using the ATtiny3217 microcontroller

• ATtiny814 Development Board A development board using the ATtiny814 microcontroller