"Saiko(u)" (さいこう) is an ESP32-based NTP clock using a GC9A01A round TFT LCD (240x240 pixels).
The analog dial design is drawn mostly in real time by code and is based on/inspired by the Seiko 5 Sports SRPK33K1 38mm diver watch, with the second hand moves 6 times a second as in the 4R36 mechanical movement. The dates do not rotate like the real movement though.
The project is not meant for commerical use. You can read more about the more detailed story on my Hackster.io project page.
ESP32 | GC9A01A |
---|---|
GND | GND |
3.3V | VCC |
18 (SCK) | SCL |
23 (MOSI) | SDA |
22 | RES (RST) |
21 | DC |
5 | CS |
3.3V | BLK (backlight) |
Note: by default the NTP client will update time every 20 minutes and will check/force update every hour.
However, the
NTPClient
may cause several-second blocking delays during the updates (which makes the watch temporarily stopped moving) due to internet or NTP server issues. There is currently no good solution to get around this but to change a better NTP server and/or a better WiFi environment depending on where you are.
In the script
-
Change the
SECRET_SSID
andSECRET_PASS
to your WiFi ssid/password insecret.h
. -
Modify
NTP_SERVER
andNTP_HOUR_OFFSET
to a preferred setting.
If DEMO_MODE
in the script is set to true
, the watch will not connect to WiFi/NTP and displays a fixed time (10:08:42 SUN 31th
).
If BENCHMARK
in the script is set to true
, it will calculate and print the time of each cycle for drawing the dial in serial.
- Most specs and color on the dial can actually be adjusted, for example:
LOGO_NAME
is the name shown on the top half of watch, andDESCRIPTION
is the smaller text on the lower half.SECOND_HAND_VIBRATION
defines the the second hand vibrations (6
= 3 Hz). The code automatically calculates the drawing cycle time and the second hand moving angle.
- The script utilizes an offscreen canvas (a buffer) to update the screen smoothly. However, it appears that the buffer cannot be as large as the screen itself without causing memory issues. This is why I chose a diver style since the outer bezel ring can be drawn only once, and I only need to update the inner dial afterwards.
- The script uses a few Adafruit GFX fonts. The complete list can be found here.
- The parts of the hour and minute hands are labeled by alphabet codes, since I do not know how to name them:
The script utilizes an offscreen canvas (a screen buffer) to update the screen smoothly. However, it appears the buffer cannot be as large as the screen itself without causing memory issues. This is why I chose the diver dial style since the outer bezel ring can be drawn only once.