import network
import time
from machine import Pin
import dht
import ujson
from umqtt.simple import MQTTClient
from hcsr04 import HCSR04
from time import sleep
MQTT_CLIENT_ID = ""
MQTT_BROKER = "mqtt-dashboard.com"
MQTT_USER = ""
MQTT_PASSWORD = ""
MQTT_TOPIC = "AMIRSAAHAL/Distance"
sensor = HCSR04(trigger_pin=5, echo_pin=18, echo_timeout_us=100000)
print("Connecting to WiFi", end="")
sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)
sta_if.connect('Wokwi-GUEST', '')
while not sta_if.isconnected():
print(".", end="")
time.sleep(0.1)
print(" Connected!")
print("Connecting to MQTT server... ", end="")
client = MQTTClient(MQTT_CLIENT_ID, MQTT_BROKER, user=MQTT_USER, password=MQTT_PASSWORD)
client.connect()
print("Connected!")
prev_distance = ""
while True:
distance = sensor.distance_cm()
print('Distance:', distance, 'cm')
sleep(1)
message = ujson.dumps(distance)
if message != prev_distance:
print("Updated!")
print("Reporting to MQTT topic {}:{} ".format(MQTT_TOPIC, message))
client.publish(MQTT_TOPIC, message)
prev_distance = message
else:
print("No change")
time.sleep(1)