Cloud Tic ⏰

ESP8266 NTP Clock v1.0

A Wi-Fi connected desk or bedroom clock built on the ESP8266 (Wemos D1 Mini / NodeMCU) with a TM1637 4-digit display, active buzzer alarms, live weather temperature, and a clean Minimal web UI — all configurable over your local network with no app required.

Features

• 🕐 NTP time sync — always accurate, no RTC chip needed
• 🌡️ Live weather — fetches temperature from OpenWeatherMap and cycles it on the display
• ⏰ 3 independent alarms — per-day scheduling, 4 tone patterns, auto-stop (after 60 sec. you can customize it in portal)
• 🌙 Night mode — auto-dims the display between set hours
• 📡 Web UI — full settings panel at http://192.168.x.xxx.
• 🔄 OTA firmware update — flash new firmware from the browser, no USB cable needed
• 💾 EEPROM persistence — all settings survive power cuts
• 📶 WiFiManager — first-boot captive portal for Wi-Fi setup, no hardcoded credentials
• 💡 Status LED — solid during AP mode, fast blink when Wi-Fi is lost
• 📟 IP scroll on boot — scrolls IP 192 168 x xxx across the display after connecting

UI

Hardware

Component	Details
Microcontroller	ESP8266 — Wemos D1 Mini or NodeMCU
Display	TM1637 4-digit 7-segment
Buzzer	Active buzzer (active LOW)
Status LED	Built-in LED on D4 (active LOW)
Power	USB 5V

Wiring

Component	ESP8266 Pin	GPIO
TM1637 CLK	D5	GPIO14
TM1637 DIO	D6	GPIO12
TM1637 VCC	3.3V or 5V	—
TM1637 GND	GND	—
Buzzer (+)	D7	GPIO13
Buzzer (−)	GND	—

Note: The buzzer are active LOW — they activate when the pin is driven LOW. If your buzzer draws more than ~12 mA, add an NPN transistor (BC547 / 2N2222) between D7 and the buzzer with a 1 kΩ base resistor.

Circuit

Flashing the Firmware

1. Download cloud_tic.bin from the Releases page
2. Install bin Flash Tool
3. Select the file and flash it

First Boot Setup

1. Power on the device — display shows AP
2. The status LED turns solid ON
3. On your phone or laptop, connect to Wi-Fi: Clock_Setup / password: 12345678
4. A captive portal will open automatically. If it doesn't, open a browser and go tohttp://192.168.4.1. — select your home Wi-Fi and enter the password
5. Device restarts, connects, and scrolls the IP address across the display
6. Status LED turns OFF — device is ready

Web Interface

Open a browser and go to:

• http://cloudtic.local — if your router supports mDNS
• http://192.168.x.x — the IP shown on the display at boot

Settings sections

Section	Controls
Time	Live clock, sync status, weather badge, Sync Now button
Display	Brightness (0–7), 12H/24H format, blink colon, night mode with start/end hour
Time Zone	UTC offset slider (−12 to +14, step 0.5)
Alarms	3 alarms — time picker, enable toggle, day selector (Sun–Sat)
Sound	Tone pattern, auto-stop duration, Stop button
Weather	Enable toggle, API key, City ID, Celsius/Fahrenheit, Refresh button
Firmware	OTA update (upload .bin), Restart button

Weather Setup

1. Sign up at openweathermap.org (free tier is enough)
2. Copy your API key
3. Find your city ID at openweathermap.org/find — search your city and note the number in the URL (e.g. 1263659 for Mannargudi)
4. In the web UI → Weather section:
   • Paste your API key
   • Enter the city ID
   • Choose Celsius or Fahrenheit
   • Enable the toggle
   • Press Refresh to test

When enabled, the display cycles: time for 10 seconds → temperature for 3 seconds → repeat.

Temperature format on display:

24°C  →  [2][4][°][C]
 7°F  →  [ ][7][°][F]
-5°C  →  [-][5][°][C]

Alarm Tones

ID	Name	Pattern
0	Classic Beep	500 ms on / 500 ms off
1	Fast Beep	100 ms on / 100 ms off
2	Double Beep	beep-beep, 700 ms pause
3	Siren	50 ms rapid on/off

During any alarm tone, the display blinks at a fixed 500 ms rate regardless of which tone is selected. The alarm auto-stops after the configured duration (default 60 seconds). You can also stop it instantly from the web UI or by Reseting the device.

OTA Firmware Update

No USB cable needed after the first flash:

1. In the web UI → Firmware → click Update
2. Select your compiled .bin file
3. Click Upload & Flash
4. Device flashes and reboots automatically

Status LED Behaviour

State	LED
Connecting / AP mode	Solid ON
Normal operation	OFF
Wi-Fi lost	Fast blink (150 ms)

License

MIT — free to use, modify, and distribute.

Credits

• tzapu/WiFiManager
• arduino-libraries/NTPClient
• bblanchon/ArduinoJson
• avishorp/TM1637
• OpenWeatherMap API