def main():
if app_config['restapi']:
restapi = RestApi()
restapi.run()
# Retrieve previously stored baselines, if any (helps the compensation algorithm).
has_baseline = False
try:
f_co2 = open('co2eq_baseline.txt', 'r')
f_tvoc = open('tvoc_baseline.txt', 'r')
co2_baseline = int(f_co2.read())
tvoc_baseline = int(f_tvoc.read())
#Use them to calibrate the sensor
sgp30.set_indoor_air_quality_baseline(co2_baseline, tvoc_baseline)
f_co2.close()
f_tvoc.close()
has_baseline = True
except:
print('Impossible to read SGP30 baselines!')
#Store the time at which last baseline has been saved
baseline_time = utime.time()
if app_config['gcp']:
# cloud connection
jwt = create_jwt(google_cloud_config['project_id'],
jwt_config['private_key'], jwt_config['algorithm'],
jwt_config['token_ttl'])
client = get_mqtt_client(google_cloud_config['project_id'],
google_cloud_config['cloud_region'],
google_cloud_config['registry_id'],
config.google_cloud_config['device_id'], jwt)
gc.collect()
ts_send_gcp = 0
ts_send_restapi = 0
# acquiring and sending data
while True:
# acquiring data
tvoc, eco2 = sgp30.indoor_air_quality
timestamp = utime.time() + epoch_offset
if tvoc > app_config['danger']:
np[0] = (255, 0, 0)
np.write()
if app_config['audio']:
warning_sound()
elif tvoc > app_config['warning']:
np[0] = (255, 255, 0)
np.write()
if app_config['audio']:
warning_sound()
else:
np[0] = (0, 255, 0)
np.write()
#sending data to restapi
if app_config['restapi']:
if utime.time() - ts_send_restapi > app_config['ts_restapi']:
restapi.tvoc = tvoc
restapi.eco2 = eco2
restapi.timestamp = timestamp
ts_send_restapi = utime.time()
#sending data to gcp
if app_config['gcp']:
if utime.time() - ts_send_gcp > app_config['ts_gcp']:
message = {
"device_id": google_cloud_config['device_id'],
"tvoc": tvoc,
"eco2": eco2,
"timestamp": timestamp
}
print("Publishing message " + str(ujson.dumps(message)))
mqtt_topic = '/devices/{}/{}'.format(
google_cloud_config['device_id'], 'events')
client.publish(mqtt_topic.encode('utf-8'),
ujson.dumps(message).encode('utf-8'))
gc.collect()
client.check_msg()
ts_send_gcp = utime.time()
gc.collect()
# Baselines should be saved after 12 hour the first
# timen then every hour according to the doc.
if (has_baseline and (utime.time() - baseline_time >= 3600)) \
or ((not has_baseline) and (utime.time() - baseline_time >= 43200)):
print('Saving baseline!')
baseline_time = utime.time()
try:
f_co2 = open('co2eq_baseline.txt', 'w')
f_tvoc = open('tvoc_baseline.txt', 'w')
bl_co2, bl_tvoc = sgp30.indoor_air_quality_baseline
f_co2.write(str(bl_co2))
f_tvoc.write(str(bl_tvoc))
f_co2.close()
f_tvoc.close()
has_baseline = True
except:
print('Impossible to write SGP30 baselines!')
gc.collect()
print("Going to sleep for about %s milliseconds!" %
app_config["deepsleepms"])
if app_config['restapi']:
utime.sleep_ms(app_config["deepsleepms"])
else:
deepsleep(app_config["deepsleepms"])
