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   Original URL : https://retrobrewcomputers.org/doku.php?id=builderpages:plasmo:z280rc:app_analog_clock
   Snapshot date: 2025-02-14
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*/

==== Table of Contents ====

[[#analog_clock_on_128x64_oled_display_over_i2c_bus|Analog clock on 128x64 OLED display over I2C bus]]

[[#introduction|Introduction]]

[[#i2c_interface|I2C Interface]]

[[#software|Software]]

====== Analog clock on 128x64 OLED display over I2C bus ======

===== Introduction =====

Z280RC has a real-time clock and I2C bus connector. This project display the RTC values on a 128×64 OLED display.

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=3649b2&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/z280rc/projects/dsc_61691130.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=422&tok=c53b6c&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fz280rc%2Fprojects%2Fdsc_61691130.jpg?600x422|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_z280rc_projects_dsc_61691130.jpg}}]]

===== I2C Interface =====

A small adapter converts pins on UEXT connector to a 4-pin connector suitable for 128×64 OLED display. The pin assignment are:

UEXT pin 1 to OLED pin 4 (VCC)

UEXT pin 2 to OLED pin 3 (Ground)

UEXT pin 5 to OLED pin 2 (SCL)

UEXT pin 6 to OLED pin 1 (SDA)

===== Software =====

Software driving the analog display.

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=fdbc2a&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/z280rc/projects/clock_oled128x64_z280rc_f.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=500&h=422&tok=4a246e&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fz280rc%2Fprojects%2Fclock_oled128x64_z280rc_f.jpg?500x422|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_z280rc_projects_clock_oled128x64_z280rc_f.jpg}}]]

YouTube video link: https://youtu.be/6nNLhokMJ5I

The [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:z280rc:projects:oled_clock_running_fast_using_lookup_tables.zip|software]] is under construction. Currently it displays the clock in accelerated time to check the graphical shape of second/minute/hour hand.