LD1117v33 (3.3V - 3 pin Voltage Regulator) WiFi Module Logic Type: NOT

Logic Type: NOT

SparkFun 16 Output I/O Expander Breakout - SX1509 can also act as a level shifter to connect a microcontroller running at one voltage level to a component running at a different voltage level

The less water in the soil means poor conductivity and will result in a higher resistance

A5:  Analog output

As it is based on light reflection

LD1117v33 (3.3V - 3 pin Voltage Regulator) WiFi Module Logic Type: NOTIntroduction : LD1117v33 (3. 3V 3 pin Voltage Regulator) is a low drop Voltage Regulator able to provide up to 800mA of Output Current. Features : Output Voltage: 3. 3V. Output Current: 800mA. Dropout Voltage: 1V. Input Voltage (Max) : 15V.