Connectors

You can use the PCB without connectors and solder the wires directly to the PCB.

However the connectors make installation, testing and repair much easier.

Mains

5pin 5.08mm grid spacing.

Neutral filtered for measurements, Neutral for triac switching, Line 1, Line 2, Line 3

Triacs

2x8pin double row = 16pin 2.54mm spacing

5V

4pin 5.08mm grid spacing

5V, GND, 5V backup, GND

Keypad

8 pin 2.54mm spacing, pin strip

Display 2.2" ili9341

14 pin 2.54mm spacing female socket and 4pin 2.54mm spacing female socket

Optional connectors:

USB programming

6pin 2.54mm spacing serial0, female pin strip

ICSP in circuit serial programming for bootloader update

2x3 pin = 6pin 2.54mm spacing, pin box

Ethernet W5500 module

2x5pin = 10pin 2.54mm spacing

You can decide wether to plug the module in directly, or connect it with a ribbon cable

GSM adafruit fona module

2x5pin = 10 pin 2.54mm spacing, for flat ribbon cable

WLAN ESP8266 programming

6pin 2.54mm spacing, female socket

I2C, e.g. for RTC real time clock

6pin 2.54mm spacing, female socket

Auxiliary mechanical relays board

2x7pin = 14 pin 2.54mm spacing, for flat ribbon cable

SSRs

2x5pin = 10 pin 2.54mm spacing, for flat ribbon cable

Additional analog inputs

2x7pin = 14 pin 2.54mm spacing, for flat ribbon cable

All connectors (sockets and plugs) are available e.g. from reichelt.de

Mains 5pin plug 5pin socket 0.58 EUR 0.31 EUR

5V 4pin plug 4pin socket 0.46 EUR 0.25 EUR

Triacs 16pin plug 16pin socket 0.16 EUR, 0.26 EUR

keypad 8pin strip 0.19 EUR

Display 14pin female socket 4pin female socket 0.75 EUR 0.21 EUR

USB serial adapter 6pin female socket strip 0.21 EUR

ICSP 2x3pin box 2x3pin plug 0.16 EUR 0.24 EUR

Ethernet module 2x5pin female socket 2x5pin box 2x5pin plug 0.29 EUR, 0,20 EUR, 0,09 EUR

GSM 2x3pin box 2x3pin plug 0.16 EUR 0.24 EUR

WLAN serial adapter 6pin female socket strip 0.21 EUR

I2C 6pin female socket strip 0.21 EUR

relays 2x7pin socket 2x7pin plug 0.22 EUR 0.14 EUR

SSRs 2x5pin box 2x5pin plug 0,20 EUR, 0,09 EUR

analog inputs 2x7pin socket 2x7pin plug 0.22 EUR 0.14 EUR

Total price: 6.19 EUR as of Dec. 2017