Tuesday, October 15, 2019

Projects

Features

  • Mains powered
  • Software control of 4 outlets:
    • On/Off override
    • C14 socket for a C13 plug - relatively common and small "rewirable" connector
    • All connected appliances must be pluggable - no screw terminals
  • One additional 'always on' outlet
  • Overall power metering
  • WiFi connectivity
  • IoT integration (MQTT?)

Power Requirements

CPU: Minimum current delivered by power supply 3.3V 500mA 0.45W
Relays: Four activated relays 12V ?  
Indicators: Five fully-illuminated LEDs @ 60mA each? 5V 300mA 1W

Components

Part Component Provides Datasheet Vendor Qty Cost Subtotal
U1 ESP32 WROVER CPU, WiFi, OTA, GPIO Datasheet Mouser 1 £3.18 £3.18
V1 Recom RAC01-12SGB AC-DC Power Supply Datasheet Mouser 1 £4.81  £4.81
RV1 B72214P2511K101 Varistor needed for RAC01 Datasheet Mouser 1 £1.02 £1.02

Power Supply

The Recom RAC01-12SGB is a 240V AC-DC power supply, with the following characteristics:

  • 1W output at 12V
  • 83mA nominal output
  • Internal 1W

Notes: For operation at 230VAC, an external MOV is recommended. The Varistor should comply with IEC-61051-2. e.g. EPCOS S14 series.

 

Components - Rejected

Power Supply

The VCE05US12 is a 240V AC-DC power supply, with the following characteristics:

  • 5W output power at 12V
  • 410mA nominal output current (541mA peak)
  • Internal T1.0 A/250 VAC fuse fitted in line

Cons: Not available from Mouser.