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46 Cat Selective Automated Food Dispenser
Advika Battini
Ali Yaqoob
Vibhu Vanjari
Yuchen He TA design_review
People with two or more cats often have one cat eating way too much food leaving the other pet starved. The chubby cat tends to eat all the food before the other one gets to it. It is also tedious to control how much food each cat gets.

Solution and features:
We aim to solve these problems by designing an automated system which controls how much food is given to each cat. The system stops the cats from eating each others food and controls how much food and at what time the cats are being fed.

A desired quantity (weight) for food can be entered. The dispenser, will have a flap door that opens/closes based on feedback from a weight sensor placed under the area/bowl the food is dispensed. Times the food is dispensed when a cat approaches can also be controlled to control when the cat eats.
The food container will have IR sensors/LEDs to indicate to the person if the level of food.

Cat Detector:
Methods to detect which cat is approaching:
RFID detection: most existing dispensers / gates use RFID concerned about IP
Cat collar color detection: The part of the collar on the cats back will be distinctly colored and will be detected by a downward facing camera.The camera will take a picture as the cat approaches the device. A motion sensor can be used to activate the camera.
A sliding door to close the access to the food bowl if the wrong cat tries to eat the food.

All the above functionality can additionally be controlled by the owner of the cats using an attached screen.

Power Considerations:
The device will be powered through the wall socket and we will implement a voltage regulator to appropriately power our PCB.

Electronic Automatic Transmission for Bicycle

Tianqi Liu, Ruijie Qi, Xingkai Zhou

Featured Project

Tianqi Liu(tliu51)

Ruijie Qi(rqi2)

Xingkai Zhou(xzhou40)

Sometimes bikers might not which gear is the optimal one to select. Bicycle changes gears by pulling or releasing a steel cable mechanically. We could potentially automate gear changing by hooking up a servo motor to the gear cable. We could calculate the optimal gear under current condition by using several sensors: two hall effect sensors, one sensing cadence from the paddle and the other one sensing the overall speed from the wheel, we could also use pressure sensors on the paddle to determine how hard the biker is paddling. With these sensors, it would be sufficient enough for use detect different terrains since the biker tend to go slower and pedal slower for uphill or go faster and pedal faster for downhill. With all these information from the sensors, we could definitely find out the optimal gear electronically. We plan to take care of the shifting of rear derailleur, if we have more time we may consider modifying the front as well.

Besides shifting automatically, we plan to add a manual mode to our project as well. With manual mode activated, the rider could override the automatic system and select the gear on its own.

We found out another group did electronic bicycle shifting in Spring 2016, but they didn't have a automatic function and didn't have the sensor set-up like ours. Commercially, both SRAM and SHIMANO have electronic shifting products, but these products integrate the servo motor inside the derailleurs, and they have a price tag over $1000. Only professionals or rich enthusiasts can have a hand on them. As our system could potentially serve as an add-on device to all bicycles with gears, it would be much cheaper.

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