SeeedStudio Grove Series - Page 41

This example code is in the public domain.
http://seeedstudio.com/wiki/Grove_-_Moisture_Sensor
*/
#include "TM1637.h"
/* Macro Define */
#define CLK 39 /* 4-digital display clock pin */
#define DIO 38 /* 4-digiral display data pin */
#define BLINK_LED RED_LED /* blink led */
#define MOISTURE_PIN 24 /* pin of 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); /* 4-digital display object */
int analog_value = 0; /* varible to store the value coming from rotary angle sensor
*/
int8_t bits[4] = {0}; /* array to store the single bits of the value */
/* 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 */