ExpEYES GSoC-15 Update

Sensor Plug-ins, Add-on devices and GUI Improvements for ExpEYES: Project Update

Things done so far….

Accelerometer/Acceleration sensor:

  • GUI in python  for interfacing ADXL 335 analog acceleration sensor module with ExpEYES.                                                                       ADXL 335-GY-61 is a small, thin, low power, complete three-axis accelerometer voltage output through theGY-61-228x228 signal conditioning at a minimum of full scale ± 3 g measurement range acceleration. It can measure the  acceleration of gravity, and movement, shock or vibration due to dynamic acceleration.Started creating documents for experimental setups and procedures for mechanics experiments and a few sound experiments.
  • Wrote python code and conducted trials to obtain Lissajous Figures using accelerometer ADXL 335. This module is useful for pendulum and other mechanics experiments.

Humidity Measurements:DHT-11

  • Carried  out several tests with Humidity Sensors HS1101, DHT 11 and HS220. DHT11 is a digital sensor and found to give better accuracy. It also measures temperature.
  • Working on DHT11 and DHT22  as they are  most suitable for portable weather-station. GUI in python is almost ready.

Temperature Measurements:

  • Tested  LM35  temperature sensor, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. LM35 does not require any external calibration or trimming to provide typical accuracies of ±1⁄4̊ C  at room temperature and ±3⁄4̊C over a full −55 to +150 ̊C temperature range.
  • GUI to interface LM35 with ExpEYES and measure temperature in Celsius is ready.
  •  Another temperature sensor PT100 tested. It offers excellent accuracy over a wide temperature range (from –200 to +850 °C). Wrote GUI program for using PT100.

Pressure Sensor:pt100url

  • Tested BMP180 Digital Barometric Pressure Sensor Board Module :This precision sensor from Bosch is tbmp180he best low-cost sensing solution for measuring barometric pressure and temperature.  ( Need to re-write the program to read data accurately)

Magnetic Field Sensor:

  • Working on 3144 Magnetic Hall Effect Sensor. ( Not able to fetch data, but this will be useful for our home-made wind speed device)

Modifications in Existing GUI’s:hallsensor

  • GUI for using Motion sensor SRF-05, (ultrasonic position sensor) is modified  for plotting real-time position.
  • Made necessary changes in GUI for Lissajous Figures using ATTINY85.

Immediate Goals:

  1. Assembling all components of Weather Station. Almost all tools are ready except wind direction tool.
  2. Completing Single GUI for fetching Data for temperature, Humidity, Pressure, wind Velocity and Direction.
  3. Complete documentation for Sensor Plug-ins and Weather-station with images/videos
  4. Using DHT11/22 for measurement of both temperature and relative humidity. Facing difficulties in reading the output of DHT11. I could do it with aurdino but need to do it with ExpEYES.
  5. Auto tweet weather data fetched from sensors.


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