Attiny202-dev board

ATtiny202 Dev Board

A small development board for the ATtiny202 microcontroller and my first PCB!

Features

• Power-Only USB Type-C Receptacle
• 3.3V LDO Voltage Regulator
• Red Power On LED Indicator
• UPDI Interface

Programming

Programmable using SerialUPDI (recommended) or jtag2updi.

Install avrdude following these instructions on their GitHub. Don't install through your system's package manager, or you'll get an older version of avrdude that doesn't have SerialUPDI.

Before you can use avr-gcc to build the program, you must first download the device-pack files from Microchip's Packs Repository. Download the one that says Microchip ATtiny Series Device Support (3.1.260) and then unzip it to a directory of your choice.

mkdir atpack
mv Microchip.ATtiny_DFP.3.1.260.atpack atpack
cd atpack && unzip Microchip.ATtiny_DFP.3.1.260.atpack

You can now build specific projects using the Makefile

make build proj=blinky atpack=~/atpack/

Or build all projects

make

After you've built your project and connected the USB to TTL adapter to your PC and the UPDI interface, upload the build files using avrdude.

avrdude -vvv -c serialupdi -b 230400 -P /dev/ttyUSB0 -p t202 -U flash:w:your_build_file.hex:a

Breaking it down (better explanation at avrdude docs):

• -vvv Enables verbose output
• -c Specifies the programmer to be used
• -b Sets the baud rate
• -P Selects which port to use
• -p Says which microcontroller we're programming for (t202 stands for ATtiny202). You can view the list of parts supported at D. List of Parts
• -U Write the hex file to flash memory and auto-detect the file format (usually Intel Hex)

Alternatively, you can also use the Makefile:

make upload proj=blinky port=/dev/ttyUSB0

Schematic

Manufacturing/Assembly

JLCPCB formatted BOM, CPL, and Gerber files can be found in hardware.

Here's how the fully assembled PCB looks.

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