Grove - Moisture Sensor

int sensorPin = A0;    // select the input pin for the potentiometer
int sensorValue = 0;  // variable to store the value coming from the sensor
 
void setup() {
  // declare the ledPin as an OUTPUT:
   Serial.begin(9600);  
}
 
void loop() {
  // read the value from the sensor:
  sensorValue = analogRead(sensorPin);    
  delay(1000);          
  Serial.print("sensor = " );                       
  Serial.println(sensorValue);                   
}

/*
  Moisture-Sensor
 The following sketch demonstrates a simple application of sensing 
 the moisture of the soil. You can know whether a plant needs water 
 or not by observing the results that the sensor outputs.
 
  The circuit:
 * Moisture-Sensor attached to pin 24 (J6 plug on Grove Base BoosterPack)
 * one side pin (either one) to ground
 * the other side pin to +VCC
 * LED anode (long leg) attached to RED_LED
 * LED cathode (short leg) attached to ground
 
 * Note:  
 
 
 This example code is in the public domain.
 
 http://seeedstudio.com/wiki/Grove_-_Moisture_Sensor
 
*/
#include "TM1637.h"
 
/* Macro Define */
#define CLK               39                  /* clock pin */
#define DIO               38                 /* data pin */
#define BLINK_LED         RED_LED            /* LED to blink */
#define MOISTURE_PIN      24                /* pin for moisture sensor */
#define THRESHOLD_VALUE   300                /* threshold for watering the flowers */
 
#define ON                 HIGH                          /* led on */
#define OFF                LOW                           /* led off */
#define _handle_led(x)     digitalWrite(BLINK_LED, x)    /* handle led */
 
/* Global Varibles */
TM1637 tm1637(CLK, DIO);                  /* create a displaying object */
int analog_value = 0;                     /* a varible to store the value coming from rotary angle sensor */
int8_t bits[4] = {0};                     /* array to store the single bits */
 
/* the setup() method runs once when the sketch starts */
void setup() {
 
    /* Initialize 4-digital display */
    tm1637.init();
    tm1637.set(BRIGHT_TYPICAL);
 
    /* declare the red_led pin as an OUTPUT */
    pinMode(BLINK_LED, OUTPUT);
 
}
 
/* the loop() method runs over and over again */
void loop() {
 
    analog_value = analogRead(MOISTURE_PIN);      /* read the value from the sensor */
 
    /* if the value is smaller than threshold, turn on led */
    if(analog_value < THRESHOLD_VALUE) {
        _handle_led(ON);       
    } else {
        _handle_led(OFF);
    }
 
    memset(bits, 0, 4);                             /* reset array when we use it */
    for(int i = 3; i >= 0; i--) {
        /* get single bits of the analog value */
        bits[i] = analog_value % 10;
        analog_value = analog_value / 10;  
        tm1637.display(i, bits[i]);                 /* display by 4-digital display */
    }
    delay(200);
}

    cd yourpath/GrovePi/Software/Python/

    nano grove_moisture_sensor.py  # "Ctrl+x" to exit #

import time
import grovepi
 
# Connect the Grove Moisture Sensor to analog port A0
# SIG,NC,VCC,GND
sensor = 0
 
while True:
    try:
        print grovepi.analogRead(sensor)
        time.sleep(.5)
 
    except KeyboardInterrupt:
        break
    except IOError:
        print "Error"

  sudo python grove_moisture_sensor.py