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Architecture

Balcony Module

Implemented Features

• Subscribe to and unsubscribe from user notifications and developer notifications
• Get notifications when it's going to rain

Cost Breakdown

Hardware

Category	Device	Quantity	Unit Price (SGD)	Remarks
Sensor	BME280	1	$3.82	temperature air pressure relative humidity
Micro-controller Unit	ESP8266 D1 Mini	1	$2.94
Enclosure	Cuboid Box	1	$2.18
Battery	AAA	4	$2.29

AWS

• User facing

  No cost involved.

• Developer facing

  Service	Purpose	Always Free Tier	Monthly Cost (SGD)
  S3	infrastructure as code	❌	< $0.005
  CloudFormation	infrastructure as code	✅	0
  CloudWatch	performance monitoring	✅	0

Telegram

No cost involved.