Week 4 - Board Initial Build, Sensor Tests & BLE Setup

Accomplishments

1. In the forth week of class, four of us (Yilun Bai, Jiawei Zhang, Zhouyang Jin, Zuyan He) finished setting up the circuit.

2. After building the circuits, all of our team members finished testing the color sensors. We analyzed the data from color sensors and got the specific data for comparison.

3. We also finished the settings of bluetooth. We could get the data from light sensors on our android application at this time.

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Drawbacks

1. The bluetooth is working on the CMD mode currently. However, we want it work on data mode.

2. Color Sensors are not stable.

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Plans on Next Week

1. PCB schematic design.

2. Multiplexer for multiple color sensors.

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Division of Labor

Yilun Bai:

1. Sensor and bluetooth Test.

2. Code. for sensor and bluetooth.

3. Build up circuits.

Jiawei Zhang:

1. Sensor and bluetooth Test.

2. Code for bluetooth.

3. Build up circuits.

4. Weekly updates.

Zhouyang Jin:

1. Sensor and bluetooth Test.

2. Code for sensor.

3. Build up circuits.

Zuyan He:

1. Sensor and bluetooth Test.

2. Code.

3. Build up circuits.

4. Weekly updates and photo taken.

Weekly Photo Log:

We received our first development kit in the middle of this week. Since then, we soldered all the pins on all color sensors, infrared sensor, Bluetooth module, and the Arduino board.

A more detailed look on our color sensor (TCS34725). The sensor we picked has a built-in LED and a color sensor, the sensor detects color by reading the RGB values from the LED light reflection on the target object.

Sensors we used in our initial design of the project: 3 x Color Sensor, and 1 x Infrared Sensor.

A test on the baby diaper indicator. Upon getting wet, the diaper indicator will change its color from yellow to blue in very short time (couple seconds).

Overview of our circuit design with one color sensor.

We established the Bluetooth connection to the cellphone, the read and write operation seems working nicely (tested via Bluefruit LE Application).

Working on the battery cap.

Video log on the Bluetooth connection displaying color sensor values on phone.