ESP-KVM is free, open-source firmware that turns an ESP32-P4 board into an IP-KVM: another computer's screen, keyboard and mouse in your browser, from the BIOS up. The M5Stack Unit RTC is an optional extra: a battery-backed clock that keeps the time across a power cut. What it does → Try the demo →
An RTC8563 (a PCF8563 twin) with its battery inside and a Grove connector.
| Status | Written from the datasheet, not run on one yet |
|---|---|
| Chip | RTC8563, at 0x51 |
| Connector | Grove (HY2.0-4P), cable in the box |
| Power | 5V; its own 3.3 V regulator, and the I2C pull-ups go to that |
| Battery | built in |
| Setting | found by itself; Settings → System → Clock |
On the M5Stack Unit PoE-P4 it goes into the Grove port: under Settings -> System → Clock pick "own pins" and name the same two pins as the display. On other boards it is four wires: 5V, GND, SDA and SCL. Its pull-ups go to its own 3.3 V, so 5V on VCC is safe for the ESP32-P4.
The driver is written from the PCF8563 datasheet. Nobody has run this unit with ESP-KVM yet.
