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Raspberry Pi Sensors

Raspberry Pi Sensors

By : Rushi Gajjar
4.4 (9)
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Raspberry Pi Sensors

Raspberry Pi Sensors

4.4 (9)
By: Rushi Gajjar

Overview of this book

This book is perfect for hardware enthusiasts who want to develop amazing projects using Raspberry Pi. Some knowledge and experience working with Linux, C, and Python is a plus, but once you're set up to go, you'll be ready to push the creative capabilities of your Raspberry Pi even further.
Table of Contents (10 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Meeting Your Buddy – the Raspberry Pi
1. Meeting Your Buddy – the Raspberry Pi
A glance at the Raspberry Pi board
Setting up for the first time
Connecting the Raspberry Pi to the Internet
A crash course on Linux
Installing useful libraries
python-gpio
Be ready with Python and C
Practice makes you perfect
Summary
2
2. Meeting the World of Electronics
2. Meeting the World of Electronics
Basic terminologies of electronics
Communication protocols
Useful tips and precautions
Understanding the GPIO port
It's time to glow LEDs!
Summary
3
3. Measuring Distance Using Ultrasonic Sensors
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3. Measuring Distance Using Ultrasonic Sensors
The mysterious ultrasonic sensor
Building the project!
Fixing common problems
A wearable device for the visually impaired
Summary
4
4. Monitoring the Atmosphere Using Sensors
4. Monitoring the Atmosphere Using Sensors
Sensor selection process
InsideDHT – temperature and humidity sensors
Introducing the photoresistor (photocell)
Building the project
Putting all the parts together
Troubleshooting common problems
Summary
5
5. Using an ADC to Interface any Analog Sensor with the Raspberry Pi
5. Using an ADC to Interface any Analog Sensor with the Raspberry Pi
Analog-to-digital convertors
MCP3008 for analog-to-digital conversion
Making your own sensor station
Generic software preparation
Using your sensor station – make a temperature logger
Summary
6
6. Uploading Data Online – Spreadsheets, Mobile, and E-mails
6. Uploading Data Online – Spreadsheets, Mobile, and E-mails
Internet of Things
Hardware setup
Synchronizing the clock with the Internet
Uploading data on Google spreadsheets
Getting notified by e-mails
Integrating everything
Common problems faced
Summary
7
7. Creating an Image Sensor Using a Camera and OpenCV
7. Creating an Image Sensor Using a Camera and OpenCV
Image processing
OpenCV
Camera interfacing with the RasPi
Live streaming using a network camera
Porting OpenCV
Create a motion detector
Amazing projects for you
Summary
8
A. Shopping List
Basic requirements
Sensors
Integrated chips
Components
Others
9
Index
Index

Fixing common problems

While building the project, many of us will not get the output the first time. Let's solve the common problems collaboratively. There are some frequently occurring problems while building the projects with the RasPi and the ultrasonic sensors.

Is it showing the distance incorrectly?

You are so enthusiastic to write the code by yourselves, and you might have been mistaken. Check the timings of turning the trigger pin for the perfect amount of time, and check whether you have read the echo pin correctly.

Some of the device response may be slow. I recommend that you add a delay of 60 ms after making the trigger pin low, as shown in the following code:

GPIO.output(23, False)
time.sleep(0.06)

If you are still not getting the result, try playing around with these values of delay. Also, check for the correct indentation of the code, which might be the major reason that you are facing the problem.

There is a high chance that you may be having so many things on your table that...

End of Section 4
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