Project

# Title Team Members TA Documents Sponsor
39 Auto-Tuner with LCD Display
 John Driscoll
Lee Susara
Nicholas Chan
**Auto-Tuner with LCD Display**

**Team:** Nicholas Chan, John Driscoll, Lee Susara

**Problem:** In order for guitars to be properly used, each string needs to be tuned to the right frequency to play the right note. This can either be done manually, or with assistance from a tuner. We would like to make this process easier though, so we would like to implement an auto-tuning device that attaches to the pegs of the guitar. While these are exist, most of these devices on the market are over $100, so we would like to make it more affordable.

**Solution:** Our solution to this would be to create an auto-tuning device using a servo motor and a feedback loop. This solves the problem because this would make the tuner much more affordable while still maintaining its main functionality. Our design would be to attach a servo motor to each peg of the guitar and, while the user plucks the string, our device would use a microphone to take in the frequency and turn the peg as need be. The note being played will also be shown on an LCD display.

**Subsystem 1:** One of the subsystems we will be the device that attaches to the head of the guitar. This device will have 6 servo motors (HS-318), one for each peg. Each motor will have a clamp that will attach to the pegs of the guitar. The device will also have an electret microphone amplifier that is picking up sound from the guitar to know what note is being played. A clamp will be used to keep the whole subsytem in place.

**Subsystem 2:** Another subsystem we will need to implement is the control subsystem, which will house our PCB (QFN-16) and logic. We will use a breadboard (103-1100) , wires, and various logic chips to implement the correct logic.

**Subsystem 3:** The last subsystem we will need is the power and user interface. This will include our battery (EN-22), power switch button (1489), and LCD display , as well as any buttons, should we need to tune the guitar to non-standard tuning. We can use the 2x16 LCD display with controller for this.

**Criterion for Success:** For our project to be effective, it must be able to pick up and filter out the frequency being played, properly take in the sound as input to determine how the guitar should be tuned, and ensure the motors are being powered and are functioning as desired. It must also fit on the head of the guitar without being too clunky, and our LCD display must display the correct notes being played. The project as a whole must also be more affordable than the current auto-tuners on the market as of right now.

GYMplement

Srinija Kakumanu, Justin Naal, Danny Rymut

Featured Project

**Problem:** When working out at home, without a trainer, it’s hard to maintain good form. Working out without good form over time can lead to injury and strain.

**Solution:** A mat to use during at-home workouts that will give feedback on your form while you're performing a variety of bodyweight exercises (multiple pushup variations, squats, lunges,) by analyzing pressure distributions and placement.

**Solution Components:**

**Subsystem 1: Mat**

- This will be built using Velostat.

- The mat will receive pressure inputs from the user.

- Velostat is able to measure pressure because it is a piezoresistive material and the more it is compressed the lower the resistance becomes. By tracking pressure distribution it will be able to analyze certain aspects of the form and provide feedback.

- Additionally, it can assist in tracking reps for certain exercises.

- The mat would also use an ultrasonic range sensor. This would be used to track reps for exercises, such as pushups and squats, where the pressure placement on the mat may not change making it difficult for the pressure sensors to track.

- The mat will not be big enough to put both feet and hands on it. Instead when you are doing pushups you would just be putting your hands on it

**Subsystem 2: Power**

- Use a portable battery back to power the mat and data transmitter subsystems.

**Subsystem 3: Data transmitter**

- Information collected from the pressure sensors in the mat will be sent to the mobile app via Bluetooth. The data will be sent to the user’s phone so that we can help the user see if the exercise is being performed safely and correctly.

**Subsystem 4: Mobile App**

- When the user first gets the mat they will be asked to perform all the supported exercises and put it their height and weight in order to calibrate the mat.

- This is where the user would build their circuit of exercises and see feedback on their performance.

- How pressure will indicate good/bad form: in the case of squats, there would be two nonzero pressure readings and if the readings are not identical then we know the user is putting too much weight on one side. This indicates bad form. We will use similar comparisons for other moves

- The most important functions of this subsystem are to store the calibration data, give the user the ability to look at their performances, build out exercise circuits and set/get reminders to work out

**Criterion for Success**

- User Interface is clear and easy to use.

- Be able to accurately and consistently track the repetitions of each exercise.

- Sensors provide data that is detailed/accurate enough to create beneficial feedback for the user

**Challenges**

- Designing a circuit using velostat will be challenging because there are limited resources available that provide instruction on how to use it.

- We must also design a custom PCB that is able to store the sensor readings and transmit the data to the phone.