https://github.com/devel0/iot-atmega8a-as-rtc

use of atmega8a as dummy rtc clock through i2c
https://github.com/devel0/iot-atmega8a-as-rtc

atmega8 i2c platformio rtc

Last synced: about 1 month ago
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use of atmega8a as dummy rtc clock through i2c

• Host: GitHub
• URL: https://github.com/devel0/iot-atmega8a-as-rtc
• Owner: devel0
• Created: 2021-12-25T03:12:19.000Z (over 4 years ago)
• Default Branch: main
• Last Pushed: 2021-12-25T03:27:10.000Z (over 4 years ago)
• Last Synced: 2025-04-02T00:37:35.804Z (about 1 year ago)
• Topics: atmega8, i2c, platformio, rtc
• Language: C++
• Homepage:
• Size: 4.88 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# iot-atmega8a-as-rtc

use of atmega8a as dummy rtc through i2c

## description

pins:

- gnd common to other master i2c

- PC5 "A5" ( SCL )

- PC4 "A4" ( SDA )

SCL and SDA need to be pulled using 4.7k resistor each line.

## i2c commands

### set time utc

```

/set YYYY-MM-DD HH:mm:ss

```

set current time

### get time utc

```

/get

```

retrieve current time in YYYY-MM-DD HH:mm:ss format ( length: 19 bytes )