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Mechatronics Exercises
IoT Sensor Bundle
Aalto University
Professor: Panu Kiviluoma
Spring 2015
By:
Oriol Ala Puig
Bijan Bayat Mokhtari
Jonas Eklöf
Max Johansson
Hyunsoo Kim
Pontus Salminen
Table of Contents
IoT Sensor Bundle .......................................................................................................................... 3
Introduction ..................................................................................................................................... 3
Starting point ................................................................................................................................... 3
Realization ...................................................................................................................................... 4
Component selection ............................................................................................................... 4
Prototyping .............................................................................................................................. 4
Coding ..................................................................................................................................... 4
Building of electronics ............................................................................................................ 5
Testing..................................................................................................................................... 5
Schedule ...................................................................................................................................... 5
Documentation ................................................................................................................................ 6
Budget ............................................................................................................................................. 6
IoT Sensor Bundle
Introduction
The objective of the project is to develop a prototype of a sensor bundle user product that connects to the
internet and send/receive information, also known as Internet of Things. The bundle will consist of the most
common sensors suitable for daily use around the house that are Arduino compatible.
Starting point
As of now, the team finished concept generation and is in procurement phase. The desired components that
the team members deemed necessary for the project have been ordered online from a Finnish website. There
are however problems ahead of the team. The problems that can be predicted are:




No extensive experience in programming and electronics means a steep learning curve
Since the project is mostly centered about programming a single code, role definition of team
members is fuzzy and hence all team members, at least in the beginning, should work together at
the same time until more clearly defined tasks are created
A large team of 6 people with different schedules is hard to bring together and manage
…
The targets set for the project are as follows:
Primary target:

Develop a functioning sensor bundle prototype by the deadline, Mechatronics Circus.
o The prototype should be able to:
1. connect to the internet,
2. receive commands as to which sensor to initiate,
3. initiate the desired sensor, collect, filter/amplify/hold, and compute the collected
data and,
4. send the data over the internet to a webpage and/or smartphone app
Secondary target after the primary target is achieved before the hard deadline:




Streamline the code and make it more efficient
Develop a PCB with the desired sensors that is very compact
Package the device in a small ,user friendly, and attractive pack
Incorporate wireless charging capability
Realization
Component selection
The components (sensors and micro controllers) have been chosen based on these factors:
 Use of the sensor on a daily basis around the house and its application
 Compatibility of the sensor with Arduino micro controllers
 Availability
 Price
 Size
 …
The selected components have been ordered from a Finnish supplier, robomaa.com. The components are
as follows:
Table 1: Components ordered
Item
LSM9DS0 IMU Breakout - 9DoF
Carbon Monoxide & Flammable Gas Sensor MQ-9 + Sensor Carrier
Sound Detector
Si7021 Temperature and Humidity Sensor
Adafruit CC3000 WiFi Shield with Onboard Ceramic Antenna
Digital Distance Sensor with GP2Y0D810Z0F
PIR Motion Sensor Module
Vibration Motor
Quantity Price (€)
1
32.90
1
9.00
1
11.90
1
18.90
1
40.90
1
9.00
1
10.00
1
7.00
sum
139.60
Prototyping
The prototyping will be done crudely on a breadboard for proof of concept. Once the readings are mapped
and dialed down a second prototype consisting of a better arrangement of sensors, cleaner set up, and 3D
printed case will be created. Third prototype will be of the new sensor bundle that has been printed on a
circuit board. This prototype will be much smaller and will consist of better electronics with a much smaller
footprint.
Coding
The main task in this project is coding. This means that all of the team members have to learn and code at
some point during the project. As of now, Max Johansson is the member with most experience in
programming for Arduino. He will be the main programmer, assign coding responsibility to members, and
assist them whenever necessary.
Building of electronics
In the first prototype, the sensors and micro controllers will be attached together on a breadboard. Once the
connections are confirmed and functional, and if the project is ahead of schedule, a PCB will be designed
and printed with the sensors incorporated into it. The team might need some external help at this stage as
they have minimal experience with electronics.
Testing
Regular testing will be conducted throughout the project as it is necessary to see if the connections are right
and if the sensors are working correctly. Sensors will also have to be tested in specific environments and
situations to map the values to desired range.
Schedule
The team has decided on a rough schedule. Since the responsibilities and exact tasks are not yet known, the
dates can only be estimated. The existing schedule will be modified concurrently throughout the project to
reflect exact projections and estimates.
Figure 1: Project schedule Gantt chart
Figure 2: Project network diagram
Documentation
Meeting minutes are documented at each meeting. The team shares a Google Drive where the documents
are made available to all. Further documents will be collected and organized along the way.
Budget
Current estimate is only for the components that are needed to buy. The estimate so far is 139.60 €. Further
expenses will most likely occur along the way such as component replacement, extra sensors, material, and
service cost.
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