/elClock

Display made with four 7-segment electroluminescent display units

Primary LanguageC++MIT LicenseMIT

elClock

Display made with four 7-Segment electroluminescent display units

Works with Alien Font Display driver board

Running in timer mode EL Timer

TBD

IEL-O-VI C63.396.208-01

  • Green, 7-segment electroluminescent display with dot on the bottom right
  • same number of segments and same pinout as the -02 version
  • pinout
    • 1: common
    • 2: bottom horizontal (M)
    • 3: bottom right dot (XS)
    • 5: n/c
    • 7: right bottom vertical (M)
    • 8: left bottom vertical (M)
    • 11: middle horizontal (M)
    • 14: left top vertical (M)
    • 17: right top vertical (M)
    • 20: top horizontal (M)
  • per-segment capacitance (estimates)
    • XS (1x): ? pFd
    • M (8x): ?? pFd

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  • Driver (bit number) to Segment (display pin #) map

    • 0: bottom horizontal (2)
    • 1: decimal point (3)
    • 2: right bottom vertical (7)
    • 3: left bottom vertical (8)
    • 4: middle horizontal (11)
    • 5: left top vertical (14)
    • 6: right top vertical (17)
    • 7: top horizontal (20)

  • DS3231 AT24C32 Real Time Clock Module (Parallax)

    • 32K EEPROM
    • 3.3-5.5V
    • I2C @ 400KHz

  • TBD

    • instrument using SensorNet library
    • use SensorNet to subscribe to time set broadcast
      • create a cron job that publishes time periodically
        • send multiple samples in a burst
      • update RTC if delta exists between it and majority of samples
    • consider muxing display units to extend lifetime of units
    • build SWMP to drive the segments at 225VAC @ 400Hz
      • 4mA per segment, max of 28 segments on: <120mA @ 225VAC (<30W)

  • Notes

    • run driver on 5V, but can use 3V3 GPIOs from ESP12F to drive the I2C bus to all the port exapanders and the RTC

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