Whilst working on the Nerf Gun PCB, Keith hit some issues, here he explains how the trouble shootingRead More
Here Keith goes through our PCB’sRead More
One thing that has cropped up each year with our robot has been wiring issues. This comes about due to the modular nature of our bot.
We can swap modules based on the challenge we are doing. This has normally led to needing to swap wires around in a very cramped space.
This year the team have decided to replace as much of the wiering as possible with custom made Printed Circuit Boards (or PCB’s).
The boards needed some of the components surface Mounted! Keith worked his magic and with the small components mounted we are ready to test them out!Read More
The below clip shows another example of our colour detection script running on the Raspberry Pi.
We have used C++ and Open CV to detect the colour at a certain position in the frame.
The colour is then show in the top left corner of the video.
This will also be shown on a tiny OLED screen on the body of the robot.
Since our robot base is staying much the same as last years, we have been working on modules that can be switched for each competition.
We need our robot to hold and fire Nerf Darts.
Our excellent team engineer has been working his magic with a 3d printer and a lot of patience to create us just what we need!
Above you can see the 3d rendering of our robot and mount. Below you can see a time-lapse of the mount being printed
This will allow us to hold a standard Nerf Dart Cartridge and fire the darts on command.
The finished mount!
One of this years challenges is to detect some coloured balls from a distance and visit them.
The full details are here. http://piwars.org/2018-competition/challenges/somewhere-over-the-rainbow/
For our robot we are using a Raspberry Pi Camera and OpenCV to detect the colours and some code written in C++.
You can see a video of our robot doing some colour detection below.
Whilst testing this we have come unstuck with the detection when it is dark or when somebody (Vince) in a very red coat walks into the frame of the camera and it detects him and not the ball.
We are planning on using a 2 times lens to bring the balls into a better focus.Read More
Keith has been using Fusion360 for a while now, in fact, he first used it back in 2015 to design the second Ipswich Makerspace PiWars robot as shown below.
Along the way Keith has learned many lessons, some lessons have been fundamental, as an example the model the renders above were taken from are so broken that they are now unusable. Towards the end of production for this robot in 2015, Keith was struggling so much with the model that the physical robot only existing one week prior to the competition. These days Keith is far more competent with Fusion360, but he is still learning lessons.
Recently for the PiWars 4 (2018) competition Keith was designing a mount for a Nerf gun, which included a servo for the trigger mechanism. Because Servos are common on robots, Keith created a servo model which he could then insert into many different models, or the same model many times. This is what the model looks like.
So lovely in fact, that Keith printed it, it came out very nice. What do you think?
Yes, you’ve got it, there is no opening for the wires. Having done this one too many times now, Keith decided to do something about it. He updated is master servo model to include the wires and this is what it looks like now.Read More
Keith has been working with a tool called “Fusion360” to create the 3d models for our robot. This can then create the 3d printing file as well as laser cutter instructions. However – one other feature is that it allows you to create an animation of the 3d object!
This video shows our Nerf mount!
Whilst designing our mount for the Nerf gun one of our Twitter followers noticed that our mount looks just like a Troll!
Take a look and see if you agree?
Keith has been doing some more model work in Fusion360 (not on the cat walk!) So far he has the guts of the Nerf gun launch system and magazine modelled, and work has started on the mount system. Over the next few weeks hopefully he will get this finished and we can get the parts cut and printed and trial fit them to the bot.Read More