ESP8266-based Watering System

What is this repository for?

It's a authomatic watering system based on ESP8266 and Arduino IDE.

Main sysem is based on NodeMCU v2 board, so other ESPs may need any adaption (i.e.: analog input adaptor, as NodeMCU has normalized 3.3V analog input meanwhile other ESPs have 1v input).

Also all libraries used are Arduino-copatible, so should be possible to adapt this program to any kind of Arduino-IDE supported platform, as Arduino Uno + Ethernet shield (not tested, maybe there're resource problems)

How do I get set up?

• Get the ZIP.
• Get my uRTCLib library: You can look at Arduino IDE library manager or download it from https://github.com/Naguissa/uRTCLib
• If you want to use MQTT, get Nick O'Leary PubSub Library (MQTT functionality). It's available on Arduino IDE's Library Manager. Also see http://pubsubclient.knolleary.net/
• If you want to use DHT sensor, get DHT sensor library by Adafruit and its dependencies. All are available on Arduino IDE's Library Manager:

• Adafruit Unified Sensor by Adafruit: https://github.com/adafruit/Adafruit_Sensor
• DHT Sensor Library by Adafruit: https://github.com/adafruit/DHT-sensor-library

• You can edit .h file to configure watering system with your options (filesystem, connection pins, negate logic devices, etc)
• Upload sketch to microcontroller
• Prepare extra data:
• If you want to use SD-card, format SD-card as FAT and copy files in data/ folder to SD-card.
• If you want to use SPIFFS instead an SD-card, upload extra data at Arduino IDE -> Tools -> ESP8266 Sketch Data Upload
• If no logs and extras, simply do nothing (except enable that option in .h file).

Recommendations

As internal data is small, use as small SPIFFS size as possible. On nodeMCU, it's preferred 1Mb SPIFFS / 3Mb code against 1Mb code / 3Mb SPIFFS

You can upload programs using OTA on same minor versions but you will need to update DATA folder when changing among major versions.

Connections on NodeMCU v3

(piece pin -- NodeMCU v3 pin)

Common

RTC:

• SDA -- D3
• SCL -- D4
• VCC -- 3V
• GND -- G

Relay:

• GND and COM joined with a jumper
• IN -- D1
• GND -- G
• VCC -- 3V

Water level switch (with VCC and GND):

• VCC - 3V
• GND - G
• NO or NC connected to D2, depending wanted logic

Water level switch (mechanical). Pin uses PULLUP mode:

• COM - G
• NO -- D2

Water pump:

• VCC -- relay NO
• GND -- G

Eletrovalve:

• Can be done as Water pump or connect as the relay, if it is low power one.

With SD-card, not compatible with low power mode or DHT11, DHT21 or DHT22

https://github.com/Naguissa/watering/blob/master/doc/watering%20-%20sdcard.svg

SD-Card reader, optional:

• MISO -- D6
• SCK -- D5
• MOSI -- D7
• CS -- D8
• 5V -- Not connected
• 3.3V -- 3V
• GND -- G

Soil Sensor:

• AO -- A0 (remember using a voltage divissor if your oard doesn't have it built-in)
• DO -- Not connected
• GND -- G
• VCC - D0 (digital pin here to connect/disconnect sensor as needed)

Without SD-card, compatible with low power mode and/or DHT11, DHT21 or DHT22

https://github.com/Naguissa/watering/blob/master/doc/watering%20-%20spiffs.svg

• Note: You can use SPIFFS for storage or directly nothing.

Soil Sensor:

• AO -- A0 (remember using a voltage divissor if your board doesn't have it built-in)
• DO -- Not connected
• GND -- G
• VCC -- D5 (digital pin to connect/disconnect sensor as needed)

DHT11/21/22:

• Pin1, VCC -- D7 (Could be D5, shared with Soil Sensor, as follow same opperation pattern)

• Pin2, DATA -- D6

• Pin4, GND -- G

• Remember 10K resistor between DHT pin1 and pin2.

Deep Sleep activation

• Remember you NEED to connect GPIO16 (D0 on NodeMCUv3) and RST pins on ESP8266 devicein order to be able to wake-up.

Who do I talk to?

• Naguissa
• Spanish site: http://www.foroelectro.net/proyectos-personales-f23/proyecto-de-riego-automatico-t103.html
• http://www.naguissa.com