ESP32 "Time from NPL" (MSF) Radio clock signal generator.
Requires an ESP32-S3.
"You give that here!" shouted Mrs Ogg, as Susan held it out of her reach. She could feel the power in the thing. It seemed to pulse in her hand.
"Have you any idea what this is, Mrs Ogg?" she said, opening her hand to reveal the little glass bulbs.
"Yes, it's an egg-timer that don't work!" Mrs Ogg sat down hard in her overstuffed chair, so that her little legs rose off the floor for a moment.
"It looks to be like a day, Mrs Ogg. A day's worth of time." Mrs Ogg glanced at Susan, and then at the little hourglass in her hand. ... Susan read the words etched on the metal base of the lifetimer: Tempus Redux. "Time Returned", she said.
Connect to a WiFi network that has one or more NTP servers advertised by the DHCP server and the "Time from NPL" (MSF) radio time signal will be output on GPIO1 when the time is synced from the network.
The current status is displayed on a LED connected to GPIO38.
| Colour | Time in sync | Transmitting |
|---|---|---|
| Green | Yes | Yes |
| Blue | No (2+ minutes) | Yes |
| Orange | No (3+ hours) | No |
| Red | Yes | No |
This project can be built with the ESP-IDF build system.
Configure:
idf.py set-target esp32s3 idf.py menuconfig
Under "Component config" you'll find "Tempus Redux" where you can configure the WiFi network and whether the output is active low or not.
Build:
idf.py build
Flash:
idf.py flash