xt-valve-timer

Arduino-based 24V solenoid valves control unit for home domotic

Hardware

NOKIA 8544 LCD monitor

Alternative device: Adafruit PCD8544

• Size: 83x48
• Power supply: 3.3V
• GPIO (fontal view, left-to-rigth)
  1. RES
  2. VOUT
  3. GND
  4. SCE
  5. D/C
  6. SDIN
  7. SCK
  8. VDD

Mega2560 + WiFi R3 ATmega2560 + Setup ESP8266

Action	1	2	3	4	5	6	7	8	RXD/TXD
USB <-> ESP8266 (Update firmare or sketch)	OFF	OFF	OFF	OFF	ON	ON	ON	OFF	RDX0
USB <-> ATmega2560 <-> ESP8266	ON	ON	ON	ON	OFF	OFF	OFF	OFF	RDX3

Usefull links:

• instructables
• medium

Software

State machine workflow

SD usage

/* SD card read/write

This example shows how to read and write data to and from an SD card file The circuit: SD card attached to SPI bus as follows: ** MOSI - pin 11 ** MISO - pin 12 ** CLK - pin 13 ** CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)

created Nov 2010 by David A. Mellis modified 9 Apr 2012 by Tom Igoe

This example code is in the public domain.

*/