WORK ACCOMPLISHED:
This week I focused on researching components for the hardware aspect of our device. I focused on exploring parts for the vibration motor, different sensors for detecting objects, how the wristband will receive information from the Raspberry Pi wirelessly, and how the wristband will be held together for the user. Also, I spent the beginning of this week preparing and presenting our proposal.
My decision making for parts was based around price, accuracy, and integration capabilities. We’re planning on using a simple Eccentric Rotating Mass (ERM) vibration motor because of size and shape. We’ll need a transistor that connects this motor to the Arduino so we have enough voltage to activate motor but it doesn’t need much We’re going to be leveraging HC-05 RF Wireless Bluetooth Transceiver that will send and receive data from the Raspberry Pi to the Arduino that will be in the wristband. Between our proposal and now we decided to make switch from the VL53L0X ToF Sensors because their field of view for object detection is minimal. We plan on moving to A02YYUW Waterproof Ultrasonic Distance Sensors or JSN-SR04T.
I spent a lot of time envisioning how the different parts will connect on the wrist band. We plan on using a mini bread board and encasing the system (breadboard, Arduino, and transceiver) in a 3D printed case while have the ERM motor embedded in a strap that will secure the case to the user’s wrist. Although the connections should be minimal I’m concerned about pin space on the breadboard and ensuring the vibrations don’t disrupt the circuit.
PROGRESS:
I’m currently on schedule with my tasks. We planned to have a finalized parts list by Monday (02/09).
NEXT WEEK’S DELIVERABLES:
Next week, I plan to focus on outlining the software stack for the sensors and motors, along with having a more detailed design for the wristband pin out. A physical design for the band would also be ideal. Lastly, I also want to put in a purchase request for parts .