Smart Environment (IoT)

Project Advisor: Preetpal KangTeam Members: Bhargava Sreekantappa Gayathri

Christopher Laurence

Ying Yuan Wu

Sensors• BMP 180 temperature sensor and Pressure– Uses I2C to read not calibrated Data

from EEPROM– Use calibrated parameter in EEPROM to

Calculate value for temperature and pressure

• HTU21D humidity sensor– Uses I2C to read calibrated data– Use formula to get relative percentage of

humidity• Si1145 Light, IR, UV sensor– Uses I2C protocol and light illumination

and IR to calculate approximate UVI value

C02 & GPS•K30 10000 ppm C02 sensor

–Uses UART to issue a command to start data collection and sends CO2 value back to microcontroller

–Uses Infrared to determine CO2 levels with self calibration after 7.5 days of activity to prevent drift

•GPS–L1 (1575.42 Mhz) capable gps module with standard NMEA protocol–Uses UART to communicate with microcontroller–1 hertz sample rate

Power management

Power management:• Operate on solar power during the day and

charge the battery.• Operate on battery during the night.• Device will be in power save mode for the

most part of the time.•Wake up every 10 minutes to post data.

Power management

• Sparkfun Sunnybuddy mppt charger is used to switch between solar and battery.

• MIC39101-3.3v is used to switch active circuitry on and off.• Enable pin of MIC39101 connects to Port2.7 to switch on and

off active circuitry(Sun tracker, sensors, wifi)

Sun tracking

• Increases available charge time to charge the battery.• Panel always operates at max capacity.

Communication with server

• Uses ESP8266 WIFI module.• Connects to pre-determined WiFi network.• Posts collected data to 3 endpoints.

– http://smartenvironmentsjsu.azurewebsites.net/info/deviceX - Device health info– http://smartenvironmentsjsu.azurewebsites.net/sensor/deviceX - Sensor data– http://smartenvironmentsjsu.azurewebsites.net/GPS/deviceX - GPS and altitude reading.

Software Flowchart

• Each sensor tasks have their own

queues and semaphores

• Tasks are scheduled in a round robin

fashion.

• Tx task puts the device to sleep for

10 minutes after all tasks have been

executed.

• After device wake-up, the tasks are

started again starting from pressure-

sensor task.

Web Portal Front-endJavascript

Bootstrap

Google Map API

amCharts

Web Portal Back-end

Express

Node.js

MongoDB