Bodgers – Introduction to Arduino

Hello again everyone.

I was away this week so Dave led the group, they did a couple of Arduino projects. They  revisited the traffic lights from December but this time used the Arduino to control them and then moved on to  a temperature and humidity sensor called the DHT11.

 

Here is the wiring diagram for  the traffic lights and you can find the code here.

arduino lights

 

Here is the wiring diagram for the DHT11 and the code is also on Dropbox here.

dht

We will be doing more with the Arduino particularly for some of our projects.

See you All again on Saturday

Declan, Dave and Alaidh

Bodgers – FreeCAD and Fritzing

Hello again everyone

This week we continued working on our Astro Pi entries and we also looked at FreeCAD and Fritzing which are tools that will help us with building our projects.

fritzing_freecad

FreeCAD, available for download from here, is used for 3D modelling and allows us design very complicated things from simple 3D shapes such as cubes and cylinders. Here are a couple of quick videos to get you started.

Then we looked at Fritzing, download from here, an application for drawing very easy to understand circuits, here’s how to draw a simple circuit using it.

 

Dave will be leading next Saturday’s session and I will see you again on the ninth of Feb.

Declan, Dave and Alaidh.

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.

circuit2

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 – 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.

Capture15

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 For The International Space Station

Hello again everybody.
This week in the Bodgers group we started working on our code for the Mission Zero Challenge.

mission-zero-logo

We began by writing a simple text message on the 8×8 full-colour LED display, then we changed the text and background colours. We then coded a picture by assigning a colour to each of the 64 LEDs on the display. We finished the session by taking a quick look at using the temperature sensor to read the temperature. Here are my slides from this week day 2.
Next week we will recap what we covered this week and we will start to personalise our code for the challenge.

In the meantime, here’s a couple of fun videos on how the Astro Pi computers got to the ISS.

See you all next 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 – 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