Four cards

BooyahDev·Silica-Custom·four_cards/cad/four_cards/four_cards.kicad_pcb

About the Four cards PCB

Four cards is an open source AVR/Arduino PCB design by BooyahDev, published on GitHub under the Unlicense license. It is a 2-layer board measuring 80 × 50 mm, with 18 components from 18 distinct parts.

Its main chip is the ATTINY1616-MNR, from the AVR/Arduino family. Other key parts include the 24AA08T-I/SN. By type, the board carries 5 capacitors, 5 resistors, 4 switches, 2 ICs and 2 diodes.

From the project

ATtiny1616を1個使い、4枚分のIDm・PMm・サービスコード・システムコード・12データブロックを、外付け24AA08に独立して保存する構成です。

- SW1〜SW4のうち1つを押している間だけ、そのカードが応答します。 - 未押下・複数同時押しでは応答しません。送信直前にも再確認します。 - カードを切り替えた最初の受信フレームは破棄して、選択カードの情報をRAMへ読み込みます。次のリーダのポーリングから応答します。読み込みには数十msを見込みますが実測は必要です。 - 4枚の保存先は256バイトずつの別バンクです。エラーログ32バイトはRAM内のみで、選択変更・電源断で消えます。 - ボタンは通信フレーム間と送信直前に判定します。通信フレームの送信を開始した後のリリースでは、そのフレームは完了します。

Main components on the Four cards

ATTINY1616-MNR24AA08T-I/SN

Four cards bill of materials (BOM)

18 components, 18 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	ATTINY1616-MNR	U1	U1
1	24AA08T-I/SN	U2	U2
1	TS-1187A-B-A-B	SW1	SW1
1	TS-1187A-B-A-B	SW2	SW2
1	TS-1187A-B-A-B	SW3	SW3
1	TS-1187A-B-A-B	SW4	SW4
1	BAT54ST	D1	D1
1	BAT54ST	D2	D2
1	47p	C1	C1
1	10n	C2	C2
1	1n	C3	C3
1	1n	C4	C4
1	100N 100n	C5	C5
1	1k	R1	R1
1	1k	R2	R2
1	510	R3	R3
1	10K 10k	R4	R4
1	10K 10k	R5	R5

Four cards design files

The KiCad project lives in the BooyahDev/Silica-Custom repository on GitHub; these links point at the commit this page was built from.

Four cards: common questions

What microcontroller does the Four cards use?

The Four cards is built around the ATTINY1616-MNR, from the AVR/Arduino family.

How big is the Four cards PCB?

The Four cards measures 80 × 50 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Four cards?

18 components, from 18 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Four cards design files?

From the BooyahDev/Silica-Custom repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Four cards design in my own project?

Yes, under the terms of its Unlicense license, which BooyahDev chose for the repository.

Can I test firmware for the Four cards without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

More boards in Silica-Custom

AVR/Arduino
1 1
BooyahDev
80 × 50 mm12 parts2LUnlicense0