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Grading Criteria

Smart Alarm Clock for the Stubborn Sleeper

Abstract

This smart alarm clock encapsulates a variety of features that are intended to wake up a stubborn sleeper who cannot get up in the mornings. As opposed to your average alarm clock, this alarm clock has the ability to wake up the user using dynamic lighting combined with customizable sounds. An external unit, which is placed beneath the mattress, has a bass shaker built in to vibrate the mattress to aid in helping the user get out of bed. The external mattress unit also has a flex sensor that can detect whether the user is in bed or not, and is used to turn off the alarm once the user gets out of bed.

Objectives & Introduction

The alarm is made up of two modules, one being the alarm clock unit and an external mattress unit which is placed underneath the user's mattress. The heart of the main alarm unit starts with the SJOneBoard (LPC1758) microcontroller. From there, we branch out to the following peripherals:

• Nordic wireless communication with the external mattress unit
• Four 8X8 blue LED matrix displays (HT16K33) with RAM mapping controller drivers interfaced over I2C
• Audio module (VS1053 Codec) with two 2W 8 OHM speakers interfaced using a Teensy Development Board which is communicating with the SJOneBoard over UART.
• RGB LED strips (144 LEDs/m) interfaced over SPI
• A capacitive snooze button interfaced over GPIO

The external mattress unit is driven by another SJOneBoard (LPC1758) microcontroller which drives the following peripherals:

• Nordic wireless communication with the main alarm unit
• Bass Shaker with a 50W amplifier interfaced over PWM
• Flex sensor interfaced using ADC

Show list of your objectives. This section includes the high level details of your project. You can write about the various sensors or peripherals you used to get your project completed.

Team Members & Responsibilities

• Sara Sepasian
• Michael Jaradah
• Rabeel Elahi
• Farhan Naeem

Schedule

Show a simple table or figures that show your scheduled as planned before you started working on the project. Then in another table column, write down the actual schedule so that readers can see the planned vs. actual goals. The point of the schedule is for readers to assess how to pace themselves if they are doing a similar project.

Parts List & Cost

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Design & Implementation

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Hardware Design

System Block Diagram

Our alarm clock contained many different components that needed to be wired together. In order to keep things packaged and wired efficiently, we decided to create a custom PCB that would fit directly on top of the SJOne board, and act as a breakout board.

To design our custom PCB board, we used Eagle version 7.5.0, which is a free tool available for download online. The application allows users to create their own PCB's for free up to a certain dimension, so we made sure to keep our board within the free space allowed. Before starting the PCB work, we made sure to download all additional libraries from outside sources such as Sparkfun and Adafruit, to avoid using hard-to-find components. Their libraries have been tested and used by many PCB's before, so we went ahead with theirs and avoided others.

The bulk of our breakout board was filled with headers, which allowed different devices such as: an amplifier, audio decoder, LED matrix displays, SPI LED strips, a Teensy Header, and the SJOne board. In addition to housing these components, the board contained a level shifter for the LED's. an RC filter designed for a transducer shaker, a power jack, a power supply for the SJOne board, a header for a capacitive switch, as well as a BLE pad and BLE Programmer header. In order to minimize noise, a power copper layer as well as a ground copper layer were added to the top and back of the board. This cleaned up the wiring a lot, since every component contained these wires.

After the schematic and board files were completed, we went with a US-based PCB fab company called OshPark. This company is known for their purple PCB's, being very reliable, and having quick turn around time. In addition to this, their website is very user friendly and designed to be for hobbyist. They do not require any gerber files, and generate every file they need by uploading the .sch and .brd files. From there, they automatically generate the files and go through the design checking process. In total, the PCB took 11 days from submission of payment to receiving the board.

Hardware Interface

In this section, you can describe how your hardware communicates, such as which BUSes used. You can discuss your driver implementation here, such that the Software Design section is isolated to talk about high level workings rather than inner working of your project.

Software Design

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Implementation

This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.

Testing & Technical Challenges

Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.

Include sub-sections that list out a problem and solution, such as:

My Issue #1

Discuss the issue and resolution.

Conclusion

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Project Video

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Project Source Code

• Sourceforge Source Code Link

References

Acknowledgement

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References Used

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Appendix

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