growdammit

Garden thing, logs temperature, humidity, soil moisture, and ambient light.

Prototype:

Prototype graph from logging overnight:

Design

Circuit

Analog Multiplexer

• E (6) connected to GND
• GND (8) connected to GND
• S1 (9) connected to GND
• S0 (10) connected to ESP D3 (GPIO0)
• A0 (12) connected to ambient light SIG
• AN (13) connected to ESP AD0
• A1 (14) connected to soil moisture SIG
• VCC (16) connected to 3.3v

Soil Moisture Sensor

• SIG pin connected to mux 14 (A1)
• GND pin connected to GND
• VCC pin connected to D2 (GPIO4)

Ambient Light Sensor

• SIG pin connected to mux 12 (A0)
• GND pin connected to GND
• VCC pin connected to D1 (GPIO5)

Temperature and Humidity Sensor

• GND pin connected to GND
• 3.3V pin connected to 3.3V
• DA pin connected to D6 (GPIO12)
• CL pin connected to D5 (GPIO14)

Parts list

• ESP8266 12E Dev Board
• Soil Moisture Sensor
• Temperature and Humidity Sensor
• Ambient Light Sensor
• Analog Multiplexer
• Solar Buddy
• Solar Panel
• Lipo
• Transistors

Datasheets

ESP8266 Dev Board

• Development Docs: https://arduino-esp8266.readthedocs.io/en/latest/index.html
• Product link: https://www.banggood.com/Geekcreit-Doit-NodeMcu-Lua-ESP8266-ESP-12E-WIFI-Development-Board-p-985891.html
• Getting started with Arduino IDE guide: http://www.instructables.com/id/Programming-the-ESP8266-12E-using-Arduino-software/
• USB Driver: http://www.chinstruments.com/downloads.shtml
• Pinout: http://www.kloppenborg.net/images/blog/esp8266/esp8266-node-mcu-pinout.png

Soil Moisture Sensor

• Product link: https://www.sparkfun.com/products/13322
• Schematic: https://cdn.sparkfun.com/datasheets/Sensors/Biometric/SparkFun_Soil_Moisture_Sensor.pdf
• Hookup guide: https://learn.sparkfun.com/tutorials/soil-moisture-sensor-hookup-guide

Temperature and Humidity Sensor

• Product link: https://www.sparkfun.com/products/13763
• Schematic: https://cdn.sparkfun.com/datasheets/Sensors/Weather/SparkFun_Si7021_Breakout.pdf
• Datasheet: https://cdn.sparkfun.com/datasheets/Sensors/Weather/Si7021.pdf
• Hookup guide: https://learn.sparkfun.com/tutorials/si7021-humidity-and-temperature-sensor-hookup-guide
• Libraries: https://github.com/sparkfun/Si7021_Breakout/tree/master/Libraries

Ambient Light Sensor

• Product link: https://www.sparkfun.com/products/8688
• Datasheet: https://www.sparkfun.com/datasheets/Sensors/Imaging/TEMT6000.pdf
• Hookup guide: https://learn.sparkfun.com/tutorials/temt6000-ambient-light-sensor-hookup-guide

Analog Multiplexer

• CD74HC4052E
• Product ink: https://www.digikey.ca/product-detail/en/texas-instruments/CD74HC4052E/296-9217-5-ND/376770
• Datasheet: https://www.ti.com/lit/ds/symlink/cd74hc4051.pdf

Solar Buddy

• Product link: https://www.sparkfun.com/products/12885
• Schematic: https://cdn.sparkfun.com/datasheets/Prototyping/SunnyBuddy-v13a.pdf
• Datasheet: https://cdn.sparkfun.com/datasheets/Prototyping/LT3652.pdf
• Hookup guide: https://learn.sparkfun.com/tutorials/sunny-buddy-solar-charger-v13-hookup-guide-

2W Solar Panel

• Product link: https://www.sparkfun.com/products/13781

Lipo

Transistors

• Datasheet: https://cdn.sparkfun.com/datasheets/Components/General/BC337.pdf