Tiny clock party – it’s not always about nanoseconds…

In my work role I’m regularly dealing with GNSS & atomic clock systems that deliver time, phase & frequency accurate to nanoseconds for those applications that require them e.g. Telecom (4G LTE-A & 5G), Power/Utility, Broadcast & Financial Services to name but a few.

Raspberry Pi Pico based EncroPi and ESP32 based M5Stick both doing RTC duty

But it’s not always about nanoseconds – here’s a selection of tiny clocks that are almost in sync to the nearest second 🙂

Pi 400 running “tty-clock” synced via chrony/NTP, M5Stick synced via SNTP over WiFi and EncroPi sync’d by hand/eye 😂

USB-RTC on the EncroPi synced by hand/eye to the laptop’s clock, M5Stick synced to (S)NTP over WiFi and the tty-clock display on a Raspberry Pi 400 synced to NTP using chrony. The NTP server used is a local stratum 1 instance (Raspberry Pi getting a 1PPS from a ublox NEO-M9T eval board).

The M5Stick features a built-in real-time clock (RTC) and also features a temperature/relative humidity sensor module but the temperature data is inaccurate as it suffers from self-heating; conducted via the connector pins from the main board 😦

The micropython used on the EncroPi stick takes about 4s from hitting “run” in Thonny before it actually sets the on-board RTC, lots of trial-and-error before getting it set close (by eye) to the other clocks’ displayed time.

LCD Clock based on a Raspberry Pi 2B
Tiny NTP LCD Clock based on a Raspberry Pi 2B with Adafruit LCD HAT (or “Pi Plate”?)

Retro clock party – some of Psion’s SIBO/EPOC16 1990s range get in on the act
Series 3 256k – Series 3a 2M – HC120

Published by zedstarr

Chilled out human being, doing techy stuff.

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