Bodgers – Traffic Light with Buzzer

This week we continued working with GPIO Zero, at the end of last week’s session we had started working on a simple LED traffic light, we finished of that this week and we added a buzzer to it.

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I had hoped to work on the HC-SR04 distance sensor but there seems to be an issue with them on the Raspberry Pi at the Moment.

Here is a video that demonstrates what we covered on Saturday.

See you all next Saturday (08-Dec) for our Christmas party.

Declan, Dave and Alaidh

 

Bodgers – Introducing Gpio Zero

Hi again everyone.

This week we started looking at physical computing and the Raspberry Pi. This involves attaching various components such as sensors, motors or controllers to the GPIO pins on our Pi. This week we connected a LED and two buttons, and we used the GPIO Zero module for Python to control them. I’ve made a video, it’s a little bit long, that covers everything from Saturday’s session.

 

At the end of the session the group started working on a traffic light idea and we will combine this with HC-SR04 ultrasonic distance sensor next week to create a measuring device.

I don’t have any slides this week as we worked directly from the GPIO Zero Documentation available at https://gpiozero.readthedocs.io. This is also available on Dropbox, along with this week’s code and a sheet that contains a drawing of our circuit and drawing of the GPIO pin layout, here: https://www.dropbox.com/sh/k26mbrfmdvq9tro/AAB5jfjkIlBqLhfnUAVVUvtJa?dl=0.

See you all next Saturday.

Declan, Dave and Alaidh.

Bodgers – Finishing Our Game

Hi again everyone.

This week we put the final touches to our game.

uwin

We added some code to increase the speed of the alien sprite as the score increased to make the game a little more difficult.

We then added some code to control what happens when the game is over.

You can find our code on Dropbox here: https://www.dropbox.com/sh/ccfaycpa1zluh8l/AAAA4dQH8EPNJicsQj7RwGgsa?dl=0

Next week we will do a quick recap of this game and then we will start looking at hardware on the Raspberry Pi.

See you all then.

Declan, Dave and Alaidh.

Bodgers – Making a better game

Hello again everyone.

We continued working with Pygame Zero this week, we began by getting everyone up to date with where we were with the game. I forgot to mention we were following the tutorial at https://pygame-zero.readthedocs.io/en/stable/introduction.html. We then changed the screen size and added a score to make our game more fun.

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Next week we will add some elements to make our game more difficult and even more fun.

I don’t have any slides this week but the code for both versions of the game are available here: https://www.dropbox.com/sh/ccfaycpa1zluh8l/AAAA4dQH8EPNJicsQj7RwGgsa?dl=0

See you all next week.

Declan, dave and Alaidh.

 

Bodgers – Making Pictures With LEDs

Hello again everyone.

We started of this week’s session by looking at the recent Soyuz rocket launch which was to send two people to the ISS. During the launch one of the booster rockets failed and the launch had to be aborted. Both crew members, astronaut Nick Hague and cosmonaut Aleksey Ovchinin, escaped without injuries.

We then continued to work on our pictures and messages for the Mission Zero Challenge. I made a video of some of the work we did, but it’s very hard to film LEDs so the quality is very poor.

If you want to find out more about the Soyuz incident and have another look at how to make pictures and messages with the Sense-hat LEDs my notes are here day 4.

Next Saturday we’ll start looking at Pygame Zero. See you all then.

Declan, Dave and Alaidh

Bodgers – Making With Trinket.io

Hello again everyone.

In the Bodgers group,  we’ve been working on code for the International Space Station. To do this we are using on online Sense Hat emulator, the Sense Hat is a special piece of hardware designed to be deployed with a Raspberry Pi on the ISS.

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The online emulator is available at https://trinket.io/sense-hat and there’s a good tutorial on the Raspberr Pi website here https://projects.raspberrypi.org/en/projects/astro-pi-mission-zero.

Here is our Trinket https://trinket.io/python/04b90b70cf.

You can play around with these and we will probably finish up with the Mission Zero Challenge for while after Saturday. My slides from last Saturday are here day 3.

See you all on Saturday.

Declan, Dave and Alaidh

Bodgers – Making a start

making

This week we got things off to a flying start with Bodgers Bingo where the Bodgers had to look out for various phrases as I went through a very long slideshow that introduced them to what we do in the Bodgers group, it went very well with lots of Starburst and Chewits for everyone. My slides are here Day 1 (PDF).

We are going to start of the year by working on the Astro Pi Mission Zero Challenge in which the Bodgers will use a Raspberry Pi Sense Hat to write a greeting and display the temperature inside the International Space Station to the astronauts on the ISS. Here are the guidelines for Mission Zero Astro_Pi_Mission_Zero_Guidelines_2018_19 (PDF).

If you’re interested in buying a Raspberry Pi I’d recommend the following sites:

https://thepihut.com/

https://shop.pimoroni.com/

For electronics components and for breadboards etc. I’ve found https://www.bitsbox.co.uk/ are good value, they also do cheap Arduino clones.

That’s all for this week, we’re really looking forward to next week.

Declan, Dave & Alaidh

Bodgers – Coolest Projects UK

As you may remember from before Christmas Kevin, Zack and Barry won a prize in the Raspberry Pi Pioneers competition, part of that prize was an invitation to Coolest Projects UK which was held in London last Saturday.IMG_20180428_130215

The first thing that struck us when we got there was how small the event was, there was about forty projects there, compared to Coolest Projects in the RDS. However this is the first time that Coolest Projects has been run in the UK so it’s a very good start. We also noticed that at least half the projects were hardware based which reflects the fact that there are more Raspberry Jams etc. than CoderDojos in the UK.

The day started with us setting up our “Piggy In The Middle” project, followed by a very nice speech by Philip Colligan. The lads then demoed their project to the public while they were waiting for the Judges. After the judging was finished there were science shows by Greg Foot and Neil Monteiro as well as stands to keep the kids entertained, Zack and Kevin really enjoyed the huge version of Connect 4 that was there. In what has now become Coolest Projects tradition for Kevin and Zack they had their picture taken again with Philip Colligan CEO of the Raspberry Pi Foundation.

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Then it was time for the results, the Mobile category award went to Meriem Ait Ziane for her app of healthy eating recipes and advice as well as support for diabetic people and a personalized diet plan according to your health conditions.

The Games category was won by Hamdan Syed and Amiyan Ezdi. The game they coded is called Calorie Challenge, which challenges you to remember the amount of calories in each meal/snack.

The Website award went to George Hart for his project called “Educelevate”. He designed the website to educate children of all ages on various topics.

The Scratch category was won by to Gabriella Jenkins and Liya John for their game “Toad Ahoy”.

The Hardware category went to Avye Couloute for her project: Voice O’tronik Bot. We were all very impressed by both Avye and her project and were delighted to see her win.

We enjoyed our visit to Coolest Projects UK and we can’t wait for Coolest Projects in the RDS.

Back in Athenry Dave helped the rest of the Bodgers with their projects.

Bodgers – Pygame Zero

This week we took a break from hardware and we looked at Pygame Zero. Pygame Zero is for creating games quickly and with fewer lines of code than would be used with Pygame. It is intended for use in education, so we can learn basic programming without needing to understand the Pygame API or how to write an event loop.

Pygame Zero is designed for the Raspberry Pi but it can be installed on other systems, we used Windows without much hassle. It comes installed on the Raspberry Pi already if you have a recent version of Raspian. To install on windows open a command prompt and type:

pip install pgzero

You may need to install Pip if you didn’t install it when you installed Python. To do this go to Control Panel/Settings and then Add/Remove Programs, scroll down and click on Python then click on modify, tick the Pip check box and save your changes.

To run your code from Idle or any other IDE you need to add two lines to your code, at the beginning before any other code you need:

import pgzrun

and at the  end of your code put:

pgzrun.go()

We will be using Pygame Zero for graphical input/output in our projects but if you want to have a go at writing a game, CodeConjuring’s Froggit youtube tutorials are a good place to start.

 

See you all next week.

Declan, Dave and Alaidh.

Bodgers – RPM & KPH

Last Saturday we had a look at how we might figure out how far and how fast a bike is going using a Raspberry Pi. We used a very basic set up with just a micro-switch attached to a toy trike with a little nut taped to the front wheel, each time the wheel rotates the nut would “click” the micro-switch.IMG_20180214_122408

We would need to use a reed switch or a hall effect sensor and a magnet attached to the wheel if we were to use this on a real bike.

We started of our coding by looking at the time.time() function. This function returns the number of seconds, in decimal form, since 01 January 1970. If we want to time an event all we have to do is use time.time() to get the start time and use it again to get the end time and then subtract the the start time from the end time.

We used this to get the the amount time it takes to do one rotation. Now we want to find out how many rotations we have per minute or RPM (revolutions per minute). As our result is in seconds the easiest thing to do is calculate revs per second so we divide 1 by the time it takes to do 1 rotation and then multiply the answer by 60 to get RPM.

Now we wanted to get KPH(kilometres per hour) so first we measured the circumference of the wheel and found it was 50cm or 0.5 Metres. We then calculated metres per minute by multiplying our RPM by 0.5 and we then multiplied this by 1000 to get KPH.

Here’s a picture of what our results could look like when displayed using Pygame. We will look at Pygame later on as it’s an excellent way of displaying information.IMG_20180214_122722

See you all after the break.

Declan, Dave and Alaidh