PROJECT 13 · CAPSTONE

Capstone: Build Your Own IoT Device

Combine the week into one device that senses, acts, and connects to the cloud, then demo it.

⬇ Download the starter sketch The starter already connects to Wi-Fi and Ubidots. Follow the TODO 1/2/3 markers to make it yours.

1 · The brief

In a team, build a device that does all three:

Senses with at least one sensor (DHT11, PIR, LDR, potentiometer)
Acts with at least one output (LED, RGB LED, buzzer, relay, OLED)
Connects to the cloud: a Ubidots dashboard (Project 11) and/or a Telegram bot (Project 12)

Keep the scope small and make it work end to end. A simple thing that fully works beats an ambitious thing that does not.

Idea	Sense	Act	Cloud
Smart room monitor	DHT11 + LDR	OLED readout	Ubidots charts
Motion security node	PIR	Buzzer	Telegram alert
Greenhouse minder	DHT11 + LDR	LED warning	Ubidots gauge + event
Cloud appliance	button	relay	Ubidots switch + Telegram
Comfort meter	DHT11	RGB LED green/yellow/red	Ubidots dashboard

Criteria	Points
Sensor reads real, sensible values	2
Actuator responds correctly	2
Data reaches the cloud	3
Full loop works live at the demo	2
Clear explanation of the idea	1

Bonus (up to 2): a cloud alert/event, a clean OLED display, or a genuinely creative idea.

Wire and test one part at a time, confirm good Serial values before adding the cloud.
Use millis(), not delay(), so Wi-Fi and MQTT stay responsive.
Keep a known-working version before adding the next feature.