Project

# Title Team Members TA Documents Sponsor
44 Electronic Sound Generator
Jeremy Hutnak
Kedong Shao
Parikshit Kapadia
Kexin Hui final_paper
presentation
proposal
Teammates: Kedong Shao (kshao5)
Jeremy Hutnak (hutnak2)
Parikshit Kapadia (pkapadi2)
We discussed it and we decided that we would like to build a relatively inexpensive, they can range from $200 to $4000, analog synthesizer that is simple to use for those that would like to make interesting effects with their music. Analog synthesizers can become very large and complex in how to work with them to create the sounds wanted. We would like to create one that would be more intuitive on how to use it as well by using a simple manual switch and dial control scheme.
We would need to build a power supply for the system, which we are thinking of using battery power to allow it to be easily transported and used, but we may have to build a power convert to use the standard wall power. We would need to design and build two oscillator circuits one voltage controlled oscillator and a low frequency oscillator. We will need one low pass filter circuit and a envelope generator circuit to modulate and filter the signal. We will need to build two amplifier circuits, one voltage controlled amplifier to boost the signals amplitude and another for the audio output. For the audio output we would also need to allow for an external amplifier,typical amplifier used for musical instruments, to be plugged in and bypass the built in output. We will also need to design and build a white noise generator to produce the white noise sound used to make sounds like wind.
The bulk of the work on the project will be designing, building, and interconnecting the circuits all together. We will also have to layout a PCB design and make some kind of container to hold the analog synthesizer.
Some challenges we will face are figuring out how to map voltages to different notes as well as making sure the circuits will all work together properly. Some of the group also has no experience working with music or analog signal processing, so we will have to work together to research and understand how each circuit will work and how they will effect each other to produce different effects.

Low Cost Myoelectric Prosthetic Hand

Michael Fatina, Jonathan Pan-Doh, Edward Wu

Low Cost Myoelectric Prosthetic Hand

Featured Project

According to the WHO, 80% of amputees are in developing nations, and less than 3% of that 80% have access to rehabilitative care. In a study by Heidi Witteveen, “the lack of sensory feedback was indicated as one of the major factors of prosthesis abandonment.” A low cost myoelectric prosthetic hand interfaced with a sensory substitution system returns functionality, increases the availability to amputees, and provides users with sensory feedback.

We will work with Aadeel Akhtar to develop a new iteration of his open source, low cost, myoelectric prosthetic hand. The current revision uses eight EMG channels, with sensors placed on the residual limb. A microcontroller communicates with an ADC, runs a classifier to determine the user’s type of grip, and controls motors in the hand achieving desired grips at predetermined velocities.

As requested by Aadeel, the socket and hand will operate independently using separate microcontrollers and interface with each other, providing modularity and customizability. The microcontroller in the socket will interface with the ADC and run the grip classifier, which will be expanded so finger velocities correspond to the amplitude of the user’s muscle activity. The hand microcontroller controls the motors and receives grip and velocity commands. Contact reflexes will be added via pressure sensors in fingertips, adjusting grip strength and velocity. The hand microcontroller will interface with existing sensory substitution systems using the pressure sensors. A PCB with a custom motor controller will fit inside the palm of the hand, and interface with the hand microcontroller.

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