 #include "base_device.h"
 #include "analog_float_switch.h"
 #include "relay_switch.h"
-#include "dht22_sensor.h"
-#include "ds18b20_sensor.h"
+#include "dht22_sensor.h"   // DHT-22 temp/humidity sensor
+#include "ds18b20_sensor.h" // one-wire temperature probe
+#include "hcsr04_sensor.h"  // HC-SR04 ultrasonic distance sensor
 
 #define DELAY 500
 

                                  // pin 7: bottom right outlet
#define START_PIN_DS18B20_SNSRS 8
#define START_PIN_DHT22_SNSRS   9

#define NUM_RELAY_SWTCHS  6 // 4 general purpose relays + 'kill switch' + grow bed valve
#define NUM_DS18B20_SNSRS 2

    Serial.println(g_ds18b20_sensor.get_status_str());  
}

void report_sr04_sensor_states()
{
    Serial.println(g_sr04_sensor.get_status_str());
}


