orologio-eink

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README

Orologio E-Ink

E-ink desk clock with a 3.7" display, ESP32-C3 and LiFePO4 battery. Connects to WiFi, syncs time via NTP and runs for about 2 years on a single ~2-hour USB-C charge.

Philosophy: "Place it and it works. Recharge it every 2 years."

Features

3.7" e-ink display (240x416 px) — sunlight readable, zero power draw at rest
ESP32-C3 in deep sleep (~5 µA), wakes up every minute to update the display
External 32.768 kHz crystal for accurate deep-sleep timekeeping (~1.7 s/day drift)
Automatic nightly NTP sync to correct drift
2x LiFePO4 18650 cells in parallel (3600 mAh) — USB-C charging via TP5000
Multiple battery chemistry support: LiFePO4, Li-Po, 3x AA alkaline (configurable via firmware and jumpers)
WiFi setup via captive portal (WiFiManager) — no serial cable needed
Automatic DST handling with IP geolocation
Optional telemetry to Google Sheets (battery voltage, USB status, location)
Custom PCB designed in KiCad and manufactured on JLCPCB

Hardware

Component	Model
MCU	ESP32-C3-MINI-1
Display	WeAct Studio 3.7" e-Paper (GDEY037T03, driver UC8253)
Battery	2x LiFePO4 18650 1800 mAh in parallel
Charger IC	TP5000 (CC/CV, cutoff 3.6 V)
LDO	MCP1700-330
Connector	USB Type-C
Crystal	32.768 kHz SMD 3215

Full pinout and circuit details are in docs/specifiche.md.

Repository structure

firmware/
  orologio_secondi.ino      # Arduino firmware (ESP32-C3)
  setup.html                 # WiFi configuration page (captive portal)
  telemetria_apps_script.js  # Google Apps Script for telemetry
pcb/
  progetto.kicad_pro         # KiCad 8 project
  progetto.kicad_sch         # schematic
  progetto.kicad_pcb         # PCB layout
  libs/                      # custom libraries and LCSC components
  loghi/                     # SVG logos on the board (CE, RoHS)
  production/                # Gerber, BOM, pick & place for JLCPCB
docs/
  specifiche.md              # full technical specifications

Comments

Orologio E-Ink

E-ink desk clock with a 3.7" display, ESP32-C3 and LiFePO4 battery. Connects to WiFi, syncs time via NTP and runs for about 2 years on a single ~2-hour USB-C charge.

Philosophy: "Place it and it works. Recharge it every 2 years."

Features

3.7" e-ink display (240x416 px) — sunlight readable, zero power draw at rest

ESP32-C3 in deep sleep (~5 µA), wakes up every minute to update the display

External 32.768 kHz crystal for accurate deep-sleep timekeeping (~1.7 s/day drift)

Automatic nightly NTP sync to correct drift

2x LiFePO4 18650 cells in parallel (3600 mAh) — USB-C charging via TP5000

Multiple battery chemistry support: LiFePO4, Li-Po, 3x AA alkaline (configurable via firmware and jumpers)

WiFi setup via captive portal (WiFiManager) — no serial cable needed

Automatic DST handling with IP geolocation

Optional telemetry to Google Sheets (battery voltage, USB status, location)

Custom PCB designed in KiCad and manufactured on JLCPCB

Hardware

Component

Model

MCU

ESP32-C3-MINI-1

Display

WeAct Studio 3.7" e-Paper (GDEY037T03, driver UC8253)

Battery

2x LiFePO4 18650 1800 mAh in parallel

Charger IC

TP5000 (CC/CV, cutoff 3.6 V)

LDO

MCP1700-330

Connector

USB Type-C

Crystal

32.768 kHz SMD 3215

Full pinout and circuit details are in docs/specifiche.md.

Repository structure

firmware/ orologio_secondi.ino # Arduino firmware (ESP32-C3) setup.html # WiFi configuration page (captive portal) telemetria_apps_script.js # Google Apps Script for telemetry pcb/ progetto.kicad_pro # KiCad 8 project progetto.kicad_sch # schematic progetto.kicad_pcb # PCB layout libs/ # custom libraries and LCSC components loghi/ # SVG logos on the board (CE, RoHS) production/ # Gerber, BOM, pick & place for JLCPCB docs/ specifiche.md # full technical specifications

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Orologio E-Ink

Features

Hardware

Repository structure

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Orologio E-Ink

Features

Hardware

Repository structure

Firmware setup

Dependencies (Arduino IDE / PlatformIO)

Battery configuration

First boot

PCB

License