leon-anavi/rpi-examples

Raspberry Pi examples

rpi-examples

This repository provides various examples for using peripheral devices such as sensors, buzzers, relays and add-on boards on Raspberry Pi single board computers written in popular programming languages C, C++, Python, etc. All examples are available under MIT license.

These examples are appropriate for beginners. Hopefully, they will encourage more developers to join the Raspberry Pi community and to help them get started easily with various peripheral devices for both professional and hobby and DIY projects.

Videos

• Buzzer: https://www.youtube.com/watch?v=j8HnKM58QXk
• LM75A: https://www.youtube.com/watch?v=pyg27uj0Xns
• HTU21D: https://www.youtube.com/watch?v=A_yruJtYUwE

Notes

If you are interested in running any of the examples for I2C written in C/C++ as a regular user (not root) perform the following steps:

• Remove line "wiringPiSetup();" in "HTU21D_test.c"
• Add your user in "i2c" group

Buzzer

C

Beep

Simple application to test if a piezo buzzer attached to pin 11 is working.

Install wiringPi and after that execute the following command to build the application:

cd buzzer/c/
gcc beep.c -o beep -lwiringPi -std=c99

Execute the following command to run the application:

sudo ./beep

Star Wars

Implementation of the Imperial March from Star Wars.

Install wiringPi and after that execute the following command to build the application:

cd buzzer/c/
gcc starwars.c -o starwars -lwiringPi -std=c99

Execute the following command to play the Imperial March:

sudo ./starwars

TSL2561

Install i2c tools:

sudo apt-get install i2c-tools

Enable i2c on Raspberry Pi with Raspian GNU/Linux distribution:

sudo raspi-config

Go to Advanced Options > A7 I2C and reboot the board

Verify that TSL2561 is detected on i2c address 39 on bus 1:

pi@raspberrypi:~ $ i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- 39 -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

Build and run the source code

cd TSL2561/c/
make
./TSL2561_test

MAX44009 Ambient Light Sensor Module

Build and run the source code

cd MAX44009/c/
make
./MAX44009_test

The example written in the C programming language has been cotributed by Pixel_K.

PN532 NFC Module

• Install Adafruit Python PN532:

sudo apt-get update
sudo apt-get install build-essential python-dev git
cd ~
git clone https://github.com/adafruit/Adafruit_Python_PN532.git
cd Adafruit_Python_PN532
sudo python setup.py install

• Clone rpi-examples:

cd ~
git clone https://github.com/leon-anavi/rpi-examples.git

• Save data to RFID/NFC card

cd ~/rpi-examples/PN532/python
sudo python rfid-save.py

• Listen and scan for RFID/NFC cards

cd ~/rpi-examples/PN532/python
sudo python rfid-scan.py

rpi-examples's Issues

Issue with TSL2561 Code

Hello Leon!

First of all, thank you for your example code - I've gotten a fair amount of mileage out of what I've worked with so far, very much appreciated!

I am however having an issue with the TSL2561 Flora Lux Sensor. I have tried both the code in example and the code in example-wiringpi with similar results. When I first ran the software, I got large numbers (i.e., 65535) for my lux value along with an Input/output error. This was because I had to change the address to the LOW value (hard coded on the Flora Lux - verified with I2CDetect). Now, however, I always receive 0. This is the case in both examples - example and example-wiringpi.

To try and do some high level debugging, I edited TSL2561_test.c again and printed out the return code for each function;
OPEN
SETGAIN
SETINTEGRATIONTIME
SENSELIGHT

Everything returns 0, which appears to be normal based upon what I'm seeing in the lower level code. I also tried playing with the gain, integration time and library auto gain, just to see if anything I did gave me a different value, but 0 on all values all the time.

Before I dive headfirst into your lower level code, is there anything you might suggest I look into? I looked at a few other examples to use, but I really much prefer going with your C code at this point, especially after the HTU21D code has proven to be so helpful!

Alright, thank you so much in advance for any assistance you might be able to provide!

Respectfully,
Marshall

Asking for username and password

type the following commands to get the source code of the example for writing and reading data to the NFC cards and RFID tags:

cd ~
git clone https://github.com/leon-anavi/rpi-examples.git

after typing this it's asking me for username and password?
please help
thank you

I2C no need to be "root"

Hi,

In the sample for HTU21D, you can check I2C values without be root:

• remove line "wiringPiSetup();" in "HTU21D_test.c"
• add your user in "i2c" group

Enjoy ! :)