The Franzininho DIY is a DIY board developed in 2017 to encourage people to assemble their own Arduino boards and have the first contact with electronics. The board is based on Arduino Gemma and Digispark hardware and can be programmed in the Arduino IDE after assembled.

Hardware

Based on the ATtiny85 microcontroller, the Franininho DIY has simple hardware designed in a way that allows people to assemble and even make their own boards at home.

The following is the Franzininho DIY circuit:

As shown in the schematic above the Franzininho DIY has lean hardware. To facilitate the hand made production, the board was developed in the single face layout and the components are all PTHs.

The following is the PCB layout of the current version:

The first version of the board was made with the USB connector drawn on the board. But due some fabrication problems, I decided to change for a PTH USB connector.

The following is the 3D model of the current version:

The board has two LEDs, one to indicate power (ON) and one for general use, connected to the PB1 pin of the ATtiny85 (this LED that is generally used for the blink).

There is also a RESET button to make it easier to enter in bootloader mode.

Pinout

All ATtiny85 pins are available in the I/ s header. The following figure shows the pins and table, their respective functions:

Several Franzininho DIY have already been assembled in Brazil, impacting thousands of people. We encourage people to build their own projects and share with others:

The project was published in CC-BY-SA 4.0 license and is available on GitHub for anyone making their own.

We have extensive documentation (only in Portuguese) available and done in a collaborative way by the community.