Attiny402 MiniSerialMonitor

Pocket-sized serial monitor

jyujyun

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Description

This is a serial monitor using an Attiny402 with 256 bytes of RAM and 4 kilobytes of ROM.
What I didn't expect was that it works just by connecting the signal wires, no batteries required.

Details

How to Use

After selecting the appropriate baud rate with the switch, connect the signal line to PA7/DAT and then connect GND.

Schematic

Files

miniSerial.zip Manufacturer files x-zip-compressed - 28.90 kB - 02/28/2026 at 18:31		Download
miniSerialOLED.ino Arduino sketch ino - 6.09 kB - 02/28/2026 at 18:08		Download

Components

1 × Attiny402
1 × SSD1306
2 × Switch
1 × PCB

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Attiny402 MiniSerialMonitor

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Description

Details

How to Use

Schematic

Files

miniSerial.zip

miniSerialOLED.ino

Components

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