The Doing a Raspberry! team's Pi Wars journey

 I found Virtual Pi Wars 2021 to be more challenging than the previous Pi Wars. This was partly because we couldn't meet up at Leicester Hackspace as we usually would, but it was also having my GCSEs in the same year. This meant we couldn't spend as long on the robot as we would have liked and the week that the videos had to be submitted Steve got a notification saying he had been in contact with someone who had COVID-19 meaning we couldn't meet as we had planned. We partially managed to achieve our main aim of getting the line following to work. The line following did work although it seemed to struggle on my course, as I have mentioned before. Another way that would have made my entry easier would have bean having two identical robots so both me and Steve could simultaneously work on the same problem. I have definitely learnt a lot from my experience in Virtual Pi Wars 2021.  I want to thank Steve Gale and Bill von Anrep for all their invaluable help throughout my Virtual...

 I found this to be one of easiest challenges as the attachment I used had been been made previously. We decided not to do this challenge Autonomously as it would have taken a lot more time which we didn't have because I had my GCSEs and having to do everything over zoom and email slowed everything down. However, I think doing it by remote control, whilst meaning we get fewer points, I do still think it was a very effective way of doing it. Video - https://youtu.be/GuJnDeJ1pFw (James)

One of the team's main goals for Virtual Pi Wars 2021 was to successfully get our robot line following. We managed to get the code working, although getting the robot to consistently follow the line, especially on an uneven course (as mentioned in the Feed the Fish Challenge post). We used a raspberry Pi camera and  code based on several tutorials, from  https://www.pyimagesearch.com and the algorithm presented by Brian Starkey - computer vision from scratch, presented at the piwars mini conference 2019. An encoder would have helped with this challenge as it would have allowed us to better control the robot. The code and some comments can be found on GitHub under  https://github.com/ windy54/webLineFollower . (Steve). Video -  https://youtu.be/i83fyuJIeoo (James)

I found this challenge very difficult as I wasn't sure how to get the nerf bullets in the top, because they would always either go straight over or hit the container.  I decided to try and raise my nerf gun attachment up so I could just point the gun into the top and drop the bullet in, however when I did this I hadn't read the rules well enough to realise there was a height limit. This resulted in me realising that the attachment was 170mm too high, although it did work very effectively (video of the mechanism in action - https://youtu.be/7mnbfLNHEIY)! Another problem was that it was slightly too wide. Although I did find a solution to this it didn't matter because we couldn't get the attachment below the height limit. I then tried to modify my original design to allow the nerf gun to fire straight up. However, this didn't give me enough accuracy and I couldn't find any other way to fire into the top within the rules. This meant I ended up just pushing golf bal...

We created the Obstacle course on a Doing A Raspberry (our team name) and a DYI theme. We used all sorts of items that we found around our house, here is the video https://youtu.be/_G9JDnGe1sU (James)