Schedule sensor readings on Greenhouse project

greenhouse.ino

#include <Arduino.h>
#include "Timer.h"

int moistureSensorPin = A0;
const int SENSOR_EN_PIN = 13;

#define SAMPLE_PERIOD 10000               // Spacing between sample extraction in miliseconds

Timer timer;

void setup() {

  pinMode(SENSOR_EN_PIN, OUTPUT);
  digitalWrite(IRRIGATION_VALVE_PIN, LOW);

  // Set up timer
  int sensorReadEvent = timer.every(SAMPLE_PERIOD, readSensorsCallback, 0);
}

void loop() {
  timer.update();
}

void readSensorsCallback(void* context) {
  //Sensor reading
  digitalWrite(SENSOR_EN_PIN, HIGH);
  delay(500);  // Just to make sure the sensor is enabled when reading from it
  uint8_t moistureVal = analogRead(moistureSensorPin);
  bleHumidityC.notify8(moistureVal);
  digitalWrite(SENSOR_EN_PIN, LOW);
}