Weekend as the word comes to our mind, we are like lot of fun and time to relax. Same I did this weekend, infact lot more than this. As I attended two meetups Pyladies and Python Pune, and it was more fun as they were organised at Reserved Bit, which I personally love to visit.
Pyladies
Saturday(25th March 17) We had our Pyladies meetup, and for this meet up we had planned to have a discussion among us, so that we can share our experience and discuss about our projects ideas. This meet up was basically organised so that we can get ideas about different projects we can work on. So we all were there by 11 am. When I reached and look around, I realized few known faces were missing from the meetup, later came to know they were having some work in college. But the good part was that we were having lot of new members this time who were working in different organisation. Also we had people who were familiar with embedded( electronics). As this was a discussion session we discussed about Pycon-Pune, which I was not able to attend :(. But most of them attended it and shared their experience. I shared my experience how I stared my journey with Python and so on..
Lot of ideas were discussed, also I got to know some of them were interested in automation, so I decided to take a session on it as I am currently working on automation using different framework like Robot Framework, Behave. Anwesha discussed about her project "Bunny Uncle" upon which she worked in Pycon-Pune. So we ended up discussing about the projects which we can work upon in our next meetup.
Python-Pune
Sunday(26th March 17) As it was Sunday I want to sleep a little more, but the topic of the meetup made me to wake up that day. Raspberry-Pi as till now I have only heard of it from many people but didn't got a chance to work with it. So this meetup was a platform to start with it. It was also at Reserved Bit. After we all were set Girish and Chandan started with the session. They introduced us to Raspberry-Pi and shared a doc how we can get started with it. So we started with installing raspbian/ubuntu on memory card.
Here are the steps shared by Girish. which we followed:
install raspbian/ubuntu on memory card.
$ df
after this you will get the mmcblock file.
then unmount the memorycard partition using umount.
$ umount /media/<user>/<partition>
format the memorycard with Fat32 filesystem.
$ sudo mkdosfs -F 32 -v /dev/mmcblk0
now copy the raspbian/ubuntu on memorycard using dd.
$ sudo dd bs=1M if="osImage.img" of=/dev/mmcblk0
to connect to the wifi network
$ vim etc/network/interfaces
auto wlan0
allow-hotplug wlan0
iface wlan0 inet manual
wpa-ssid "reserved-bit"
wpa-psk "8tn6r23eskasm"
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
to enable ssh
$ touch /etc/SSHFLAG
$ vim /etc/rc.local
if [ -e /etc/SSHFLAG ]; then
/usr/sbin/update-rc.d -f ssh defaults
/bin/rm /etc/SSHFLAG
/sbin/shutdown -r now
fi
sudo /etc/init.d/ssh start
exit 0
to start vnc session
$ sudo apt-get install tightvncserver
$ vncserver :1 -geometry 1024x768 -depth 24 -dpi 96
You will require a password to access your desktops.
Password:
Warning: password truncated to the length of 8.
Verify:
Would you like to enter a view-only password (y/n)? n
first get update.
sudo apt-get update
then install python-dev
sudo apt-get install python-dev
try if RPi.GPIO is there in python packages.
import RPi.GPIO as gpio
check the version of GPIO
After this we were able to ssh to our pi and were ready to play with it. Upto this it was the time for lunch which was already there from Rajdhani arranged by Python Pune group only.
After this came the electronics part for which Nikhil took over the session. We started with very simple program to glow a led. Then we added a switch to control the led. So it was fun modifying our code and have different pattern in which led was glowing. A simple program for led and button is as below:
from RPi import GPIO as io
import time
io.setmode(io.BOARD)
io.setup(18, io.IN, pull_up_down=io.PUD_DOWN)
io.setup(16, io.OUT)
def check_button_state():
while True:
if io.input(18) == 1:
print("pressed")
io.output(16, io.LOW)
time.sleep(1)
io.output(16, io.HIGH)
else:
pass
try:
check_button_state()
except:
print 'except'
io.cleanup()
