PCB Design
Arduino UNO with integrated Heartbeat & Temperature Sensors
Project Objective:
I took the class on PCB Design to understand the electrical hardware design perspective in consumer electronics. The objective of this project was to "Design and build a 4-layer Arduino Uno with on-board Heartbeat and Temperature Sensors". The additional requirements were to have minimal ground-bounce and cross-talk noises compared to a commercial Arduino Uno.
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Results:
The newly designed board did not have any considerable noise at switching because of continuous ground plane in the middle layers, providing short return paths for all the signal traces. The whole board was built in $30.
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Project Contributors:
Team Member: Chinmay Patil
Project Mentor: Dr. Eric Bogatin
My Role:
As a PCB Design Engineer, I worked towards generating the board schematics and layout on the Altium Designer Tool. A FTDI-USB to UART chip was used to communicate effectively between the Arduino IDE tool and Atmega328. A Temperature sensor and a Heartbeat sensor were implemented, as additional board features, by interfacing through the I2C bus using a 16-bit ADC. The board was fabricated from PCBWay and all the SMT components were hand-soldered. A standard pin-layout similar to a commercial Arduino was followed to install an external shield whenever required. I also got experience in performing circuit analysis, selecting components from Digikey, carrying out "To the Specs" testing using an oscilloscope and hardware debugging.