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Weekly Updates

February 26, 2021

• Developed idea with potential addition of two to three ultrasonic sensors and use of stereo sound for directional distance sensing.
  • Ordered addional ultrasonic sensors:
• Refined sound delivery method to use DAC, I2C, and I2S with onboard stereo jack rather than bluetooth.
• Updated parts list and block diagram to reflect above changes.
• Imported initial work with ultrasonic sensor and onboard gyroscope.

March 5, 2021

• Got toggling functionality working using gyroscope and one ultrasonic sensor.
  • In the process of reading distance on multiple channels
• Some work done regarding initialization of audio jack.
• Made plans to acquire hat which will house components.

March 12, 2021

• Achieved dual channel distance reading using two ultrasonic sensors.
  • Added a low-power state by disabling clocks when no reading is desired.
• Output some static noise by interfacing with audio jack.
• Acquired hat and LED strip for plans to add an active/inactive indicator.

March 17, 2021 (Final Submission):

• Added third ultrasonic sensor to measure distance directly in front of the user.
  • The other two sensors are placed at 45 degree angles to the left and right.
• Changed trigger to be the same for all ultrasonic sensors.
• Moved ultrasonic sensors off of PB6 and PB7 because they are used for I2C.
  • Echo pins now connected to PA0, PA1, and PA2.
• Got quick beeps to play through the audio jack using I2C and I2S.
• Added LED strip to indicate when the device is in “active” mode, connecting the data line via PWM.