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Dubbie Dubbie's Blog

28 posts
I have a problem with the Element14 web site. Whenever I try to view my emails and messages the number next to the bell turns to a dash and no matter what I do I cannot view any of the messages. Additionally, I cannot create a Blog or look at my actions until after I have selected another process from the drop down menus - at which point the number of messages re-appears and everything works again, except for accessing messages. I'm sure I saw some similar problem to this in another Blog somewhe ...
For my TinyMobot  project ( Tiny24hourMoBot #5 : Post Script - Making it even Tinier ) I have been looking for some smaller motors to replace the continuous rotation micro servo motors I currently use. I have ordered a selection of various types, including some small stepper motors and the first of these have arrived.   There are micro DC motors approximately 8 mm long and 4 mm in diameter. They are designed to be vibrators in mobile phones so come with an off-centre weight attached. ...
eI have now re-assembled the robot arm more correctly and connected all the wiring together and it is all working, sort of!   I downloaded the correct software now as I think the software I was looking at in Blog4 was the right one. LewanSoul make all their software downloads available in the same place so you have to look for the right one rather than just download what shows on the robot you are looking at. Anyway, once downloaded and everything plugged in it started to work. I wasn't su ...
Having completed the mechanical assembly I moved onto the electrical assembly, which is essentially just the connecting of the servo motors inserial format to the controller and then adding power. However, when trying to wire up the servo motors I discovered that I had made a small mistake right at the beginning when assembling the base where I had turned one of the plates the wrong way up. What this meant was that two holes did not align and therefore the small three wire cables used to connect ...
I have now completed the mechanical build of the LewanSoul xArm Robotic Arm. Apart from a few quirky bits in the video (only) construction guide I was able to put the whole arm without too much difficulty. There are still a few aspects that I am not sure about but I assume these will be sorted out during the wiring and calibration processes, which are the next steps.       So far it has all been good and seems well worth the money that I spent on it.   Dubbie ...
There directions for building the xArm are only available on the internet as a sequence of YouTube videos, 15 in all. It is the first time I have used this approach for assembling a robot. The videos seem to be animations of the 3D CAD design and seem pretty good. Regretfully there are no written or audio instructions to go along with the video so you have to follow the video very closely. There is quite a nice piano accompaniment to the videos but after several rewinds and replays it does get o ...
Eventually managed to connect to my old Raspberry Pi 1B. Not entirely sure which thing fixed the problem but I created a ssh file with no file extension, as a text file, as Shabaz described (who knew you could do such a thing? And why would you want to? I've never needed to do it before in 37 years of computing) which didn't resolve the problem by itself. But I then went to my local WiFi hub/router thingy and noticed that there was nothing listed as being plugged into the Ethernet. I then realis ...
As it seems possible to setup the old Raspberry Pi 1B that I have borrowed I set about doing everything necessary.   I inserted the SD card into my newly discovered SD card slot in my laptop and low and behold, it was recognised and mounted. Unfortunately it then said the SD card had to be reformatted. As I had been given permission to wipe this card I did so and that seemed to work OK   Then I had to download an image of the Raspberry Pi operating system, which I think is called Deb ...
Although mobile robots are the bees knees when it comes to robotics I do also like robot arms. I have played with a MeArm of the type featured in a coming MeArm Maker RoadTest due to start sometime in March I think. I had a redesign of the MeArm done to use fewer servo motors so that it could be assembled by my students at the University for a first year engineering laboratory which was fun, where I ended up with hundreds of the mostly partially completed arms. I might even have a go at 3D print ...
As I am thinking of taking part in the Picasso Design Challenge that uses a Raspberry Pi 3 B+ and not knowing very much about any Raspberry Pi I thought I would borrow one and see what I could do. I obtained an old one from my son which I am now attempting to get going.   I have searched some of the Element14 older material and managed to find out that I have a Raspberry Pi Model B (but not a B+). But so far I have not been able to find out how to connect it up so that I can at least turn ...
I am still working on my Tiny24hourMobot, which as the Question of Scale Project14 has finished I will now call TinyMoBot. As I do not yet have the smaller parts needed to make TinyMoBot fit inside the spray can lid I thought I would look at slightly larger alternatives. For Christmas decorations (the Merry Boxes and LEDs Challenge) I purchased some small glass cloches, although I never used them. I came upon one recently and realised that it was about the same size as the spray can lid I have b ...
I have now connected both of the motors within Tobbie to the Arduino that I have used to replace the provided control PCB, The DRV8833 PCB that I am using has two H bridge drivers so I just connected the second motor for rotating the head, to the second channel. No other additional connections ere necessary. I then set it to walk for one second, rotate clockwise for one second and then repeat this process. This was just an initial trial programme to ensure that everything was working correctly b ...
The fourth and final week of the FutureLearn Beginning Robotics MOOC has now come.  This week the emphasis is much more on control strategies for the mobile robot and on self-learning. The same types of mobile robots are discussed but with slightly different characteristics. So there are light seekers and light avoiders and those inhibited by light. These are classed as Braitenburg robots. I had not heard of these robots before and this section was very interesting as they use a form of art ...
Now that the existing control PCB has been removed from Tobbie I can replace it an Arduino. I have decided to use an Arduino Nano, mainly because it is small and I have one. It might even be possible to fit it all inside the available head cavity in Tobbie. So far all I have done is to use a low cost dual H bridge driver PCB (DRV8833) which is widely available and just use one channel to drive the motor for walking. This initial programme just turns the motor on for one second and then turns it ...
Now that Tobbie has been successfully assembled it is time to take him apart again so that I can replace the existing control PCB with an Arduino Nano. Despite having only recently assembled Tobbie for disassembly I thought I would have to remove the legs again in order to split the body to get inside the head. After a careful period spent removing the legs, which was much more difficult than I expected, I realised that it was only necessary to remove two screws and the head would come apart!. I ...