VFD Clock
Sep 21st, 2020 | by: Mikael JanssonCategory: Electronics Clocks
Clock with vacuum florecent display, wifi based and NTP sync.
Based on ESP8266 and MAXIM6921.
And three home designed PCB's.
Powered by a 5v usb Charger, the first board creates 3 voltages:
- 3v3 för the ESP
- 5v for ATTiny85
- 20v for the VFD through the driver.
The second board is the main board for the ESP and the VFD-driver.This board also has a button to GPIO0 for boot loader mode that also is used for UTC hour offset. UTC offset is stored in flash in case of power loss. (Currently software only supports full hour offset)
The third board is the riser cardwhere the tube is soldered to.
The board design is modular to support several type of functions, the board interlinks with all needed connections:
- GND
- 3v3
- 5v
- voltages set by dc-boost circuit
- esp8266 rx and tx
- I2C
The software connects to wifi and if unsuccessful it opens a wi-fi access point so you can set the corrrect wifi credientials. It also supports OTA.
There is no RTC so the ESP keeps track of time and frequently makes a NTP update to not drift.
PHOTO GALLERY
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Good one
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Thanks. 😀
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