I am trying to implement a tracker device in my car. I am using A9G board to develop the tracker. The GPS and GPRS works individually very fine. But when I try to push real gps data to mqtt over gprs gps package provides 0 tracked satellites. Is there any problem with power or code ? Do I need to customize any hardware?
I am using XL4015 DC-DC converter. The output of XL4015 is 5V-2A
import machine
import time
import cellular
import gps
import ujson
from umqtt import simple
import utime
# Constants
LED_PIN = 27
CONNECT_RETRY_DELAY = 5
TOPIC = "username/feeds/mycar"
MQTT_NAME = "a9g-micropython-board"
MQTT_SERVER = "io.adafruit.com"
MQTT_PORT = 1883
MQTT_USERNAME = "username"
MQTT_PASSWORD = "pass"
SECONDS_IN_DAY = 24 * 60 * 60
SECONDS_MICROPYTHON_TO_UNIX = 946684800
led = machine.Pin(LED_PIN, machine.Pin.OUT, 1)
green_led = machine.Pin(30, machine.Pin.OUT, 0)
red_led = machine.Pin(26, machine.Pin.OUT, 0)
blue_led = machine.Pin(25, machine.Pin.OUT, 0)
isFirstTime = True
last_published_time = 0
client = simple.MQTTClient(MQTT_NAME, MQTT_SERVER, MQTT_PORT, MQTT_USERNAME, MQTT_PASSWORD)
def allOutLed():
green_led.value(0)
red_led.value(0)
blue_led.value(0)
def publish_gps_data(client, satellites, location, formatted_datetime):
data_array = [
satellites[0],
satellites[1],
formatted_datetime,
location[0],
location[1],
]
json_data = ujson.dumps(data_array)
client.publish(topic=TOPIC, msg=json_data, retain=False, qos=1)
led.value(1)
def get_current_time():
return utime.time()
def connect_to_cellular():
global isFirstTime
while True:
print("I am in cellular Loop")
allOutLed()
red_led.value(1)
if not isFirstTime:
if cellular.gprs():
break
try:
cellular.gprs("apn_name", "", "")
break
except Exception as e:
print("Error connecting to cellular:", e)
time.sleep(CONNECT_RETRY_DELAY)
isFirstTime = False
return
def connect_to_mqtt():
while True:
allOutLed()
blue_led.value(1)
try:
client = simple.MQTTClient(MQTT_NAME, MQTT_SERVER, MQTT_PORT, MQTT_USERNAME, MQTT_PASSWORD)
client.connect()
break
except Exception as e:
print(e)
continue
return
def main():
allOutLed()
while True:
connect_to_cellular()
try:
connect_to_mqtt()
except Exception as e:
print("Error:", e)
continue
gps.on()
allOutLed()
green_led.value(1)
publish_gps_data(client, gps.get_satellites(), gps.get_location(), gps.time())
time.sleep(20)
if __name__ == "__main__":
main()
I am trying to implement a tracker device in my car. I am using A9G board to develop the tracker. The GPS and GPRS works individually very fine. But when I try to push real gps data to mqtt over gprs gps package provides 0 tracked satellites. Is there any problem with power or code ? Do I need to customize any hardware?
I am using XL4015 DC-DC converter. The output of XL4015 is 5V-2A