4LAMP2 (aka flamp2)

An actually-smart lighting controller for ESP32, rewritten from scratch and upgraded to behave like a grown-up system.

4LAMP2 turns your light on only when two conditions are met:

1. Your home has working internet access
2. You are physically present (your phone responds to local network pings)

No apps. No buttons. No rituals.
Just logic.

🔧 What It Does

4LAMP2 continuously monitors three things:

• Wi-Fi state — connects, reconnects, and survives drops
• Internet reachability — via ICMP ping to a public DNS server
• Phone presence — via ICMP ping to your phone’s local IP

The external lamp is turned ON only when:

• Internet is reachable
• Your phone is reachable

If either condition fails — the light turns OFF.

Hardware

• ESP32
• External load via GPIO (relay or N-channel MOSFET)
• Onboard LED used for boot indication

Default pins:

• External lamp: GPIO 7
• Onboard LED: GPIO 8

Presence Detection (No Cloud, No Tracking)

Your phone is detected purely by:

• Local network ICMP ping
• No apps
• No Bluetooth
• No vendor lock-in

If your phone stops responding for 45 minutes, it is considered gone.

⚠️ iOS devices usually stop responding to pings when the screen is off.
Android may work better, but hasn’t been tested.

Internet-Aware Auto Shutoff

If internet connectivity disappears for longer than ~90 seconds:

• The lamp shuts off automatically

This is intentional.

Some houses become unlivable at night when the internet is down and a bright light stays on forever.
4LAMP2 respects sleep.

⚙️ Smart Ping Management

To avoid unnecessary network spam:

• Phone pings run aggressively when presence matters
• After 15 minutes of continuous presence, phone pings are reduced
• Pings resume automatically when needed again

This keeps the system responsive without being noisy.

Architecture Highlights

• Event-driven design using FreeRTOS Event Groups
• Separate logic for:
  • Wi-Fi state
  • Internet reachability
  • Phone presence
• Infinite ping sessions with timeout-based validation
• Safe recovery from Wi-Fi disconnects and IP loss
• really really "hope it works" logic.

"Smart" Devices

If a light:

• needs an app
• needs you to press a button
• needs cloud servers to exist

…it’s not smart.
It’s just remote-controlled.

4LAMP2 is automated.
It observes reality and reacts.

That’s the whole point.

4LAMP2 doesn’t ask you what to do.
It already knows.