Testing the Tiny Opensource Underwater Vehicle (TOUV-1) and Makertube

I acknowledge the irony of posting about Makertube on this old (est 2007) blogspot (google hosted)... I'd love to move everything towards the fediverse and away from the capitalist monoliths but this blogspot is almost like a listed historic building... one day I may migrate it. 

That aside, above is a circa 1 minute video of the TOUV-1, a small brushed DC motor powered tiny underwater vehicle. I'm writing an article about the design/build for Raspberry Pi magazine (I'm using a Pico plugged into my StoRPer board for a controller!) and will get the source released in the next week or so. It's been a fun first foray into underwater stuff and I'd love to create more. 

And yes, it's my first video posted to Makertube a maker themed peertube instance. It's pretty straightforward to join and use and it's a PLEASURE that there are no adverts! I don't plan to take down my Youtube account (hell somewhere out there there is a Vimeo account as well!) but in the future all my sporadic video stuff is heading to the fediverse. Do give me a follow over on Makertube!

DIY Bike Stem/Feed Bag With Bonus Tent Recycling

 

 

 

Spent a little time today knocking up a first attempt at a DIY Stem/Feed bag for on the bike. The idea is that you have a set of loops around the bag to shockcord or velcro onto the handlebars and then some more webbing loops across the bottom panel to connect to the fork crown so the bag stays snugly in place. The main grey material is some pretty thick vulcanised fabric I bought a while back specifically for bag making but the bag is lined with, well, my old tent!

A couple of weeks back I travelled up to Open Hardware Summit to both check out the talks and stuff, cover it for Raspberry Pi magazine, and to help run a panel on Opensource Rocketry. In a fit of cheapness and adventure I schlep'd up on the train with camping gear and camped a bit out of town. We own loads of tents but I decided to take this 25 yr old Coleman 2 person tent. It's not a very lightweight tent but it was a good balance of size and weight for carrying it but not walking long distance with it, versus having a reasonable bit of room. It hadn't been used for a while so I re-waterproofed it the week before the trip. Sadly... whilst I spray treated it, I failed to generally inspect the seams and they'd failed in numerous places. I'd already patched and fixed numerous parts of it, so on return home, I decided to end of life the tent and use it for parts!

 

 The bag is lined and I've used a part of the tent outer for the liner, and also for the small drawstring lid. I also used some of the binding from the tent for the binding around the upper edge of the bags main section.

 

I love my sewing machine! It's a Brother FS60 which I was given by a family member. It's really good, but projects like this definitely show that it's a machine mostly for fancy stitches in fine materials as opposed to stitching through multiple thick layers of fabric and webbing.  I spent a lot of time struggling with the machine and I'm definitely up for picking up something a little more industrial at some point.

 

 

The bag works well, I'm obsessed with these super handy ranger bead knots which work well to cinch up the top section of the bag.  There's plenty of space in it for even the largest water bottle. I'll use this one a little, but I'd like to make a matching pair eventually, but will probably try a few different designs. I've seen someone using using a rectangle as 3 sides of a square body and then an L shape rectangle to make the base and final side, seems like it would be simpler to produce. Also lots of people add pockets and other features which I'm keen to explore. There's also stuff to think about with the webbing mounts. I could make machine stitching easier by not making the webbing run through the bag seams, but also could potentially make bags that could be used not only mounted to bike handlebars, but potentially front fork bottle cages and also to other objects/rucksacks/packs etc.

Tiny DIY Knife from Hacksaw Blade

A lifetime ago I was really into Locksport and in particular into making manual tools and picks, I'd often use hacksaw blades as a cheap stock of very hard decent steel. I've also always wanted to tinker with knife making and today the synapses all fired at once and I made this.

 

 Starting with a small length of hacksaw blade I made a crude drawing on some card, cut it out and glued it to the stock. Ages ago I bought one of those tiny, cheap, yet surprisingly useful 12V belt grinders. I could do with making some jigs/holding to make my bevels absolutely correct but for half an hour of off hand grinding it's not the worst for a first attempt.

 

I ground out the original hole to accomodate the little piece of brass tubing I'd found and I also ground a hole (this steel is incredibly hard to drill unless you temper it and re harden) and throughout the grinding I kept cooling the blade in water so it didn't lose it's hardness. 

 

Then a super quick little bit of design work in FreeCAD and some 3D printing it was time to assemble. The scales are printed in PETG and I've used some epoxy resin to hold it all together. Despite my grinding it's wicked sharp so I deffo need to come up with a small sheath. Finished off with a small lanyard it's been a good fun little project and it's possibly inspired me to look for a larger piece of steel for further attempts! 

 

SOURCE Issue 1 out now! Computational Fluid Dynamics

 I've been tinkering on two things a lot for the last couple of months. One has been an odyssey into learning Computational Fluid Dynamics using the amazing CfdOF FreeCAD add on workbench. The second is I've been wanting to, for a long time, learn some kind of opensource tool for page layout/design.

 In an effort to create a commitment to this learning I've decided to launch something called "SOURCE". SOURCE is a little home for me to place longer tutorial content that's beyond what my amazing paying clients would want. I'm aiming to bring one out every quarter (the observant will note issue one is marked as June 2025 so I've given myself and extra few weeks for Issue 2)!

 It's opensource, it's made in Scribus and the archive for this issue can be found on Github here under a CC-BY-NC v4.0 license. It's free... or it's pay what you feel! There are donation links in the PDF for Paypal or KoFi, it's a HUGE amount of work even for this first 11 page experimental issue so any donations will help me keep assigning hours to it. I plan to have larger and more varied content in upcoming issues. Finally... do share it! I'd love it to be decentralised and disseminated far and wide... send the PDF in email (compression may help), host it somewhere, seed it, whatever! Download SOURCE Issue 1 here.

Picocalc, Having fun with PicoMite!

 

So I am a sucker for portable tech. In fact as well as a heap of old Palm PDA's I own things like a Pocketchip and indeed every portable so far released by ClockworkPi. So the latest offering from them, Picocalc was always going to be on my desk too!

It's a fun platform and I think I can really see it getting some traction over the next few years as it's already been hacked around on a lot by the community and it's available for $75. AND, wonderfully, it arrived after a few weeks, much better than my pay now wait 18 months for my Uconsole! 

So what is it.. well, It's a Pico compatible handheld that ships with a Pico on board flashed with PicoMite which is essentially a port of MMBasic. Assembly is gorgeous with superb instructions and the build quality is high and typical of ClockworkPi products. It's got a nice screen and you can power it from one or two 18650 cells. 

The keyboard has a click but it's pretty nice to use and feels like a spacious thumb-board. You can do a stack on it and it doesn't get to wearing! Oh and the keyboard is back-lit with two brightness levels so it's pretty lovely to work on in low light. 

Over on the forum there is LOADS going on with this. There's already lots of different bits and bobs ported to it, Micropython, Lua, Lisp and more. And that's just with the onboard Pico. Tantalisingly (and I have one on my desk for when I get to it) it's possible to insert a Luckfox Lyra board which can run full Linux environments, there's a really active thread where this is being developed very quickly, loads of game emulators, people working on getting WiFi adaptors up and running and more. Amazing. 

For me in the week or so since I built mine I've just been tinkering with it in Basic mode, I'm mucking about relearning basic and slowly working on a little suite of calculator scripts for useful things for me (descent rate calculators, parachute design stuff etc). It's such a nice object to tinker on and feels cool to be working with older languages like Basic whilst having modern stuff like a vacuous SD card to save stuff too!

Lovely Friends make Lovely Things, Steam Engineers Spoonbot

I've met some lovely people in my time as a maker/tinkerer. None more so than the mighty Snoof and Chris who form Steam Engineers. They are constantly working on expanding STEAM activities and making inclusive exciting STEAM education available and accessible. So I was delighted when they sent me a new little item they had made, Spoonbot. 

Spoonbot has a few aspects, it can be a reasonably challenging soldering kit, features some microprocessor entinkerment so could be used for beginner and intermediate STEAM activities, which the team will happily talk to you about delivering. However, it can also be bought as a fully built object from their Tindie store and it's that I was gifted. 

The lovely full colour PCB has the robot design on it and it's flashed so that you have a small rotary dial on the side with which you can adjust your Spoonbot LED level. For those that perhaps run out of spoons socially and struggle to sometimes communicate that this is a really valuable tool to tell others in the world whether your social battery is full or somewhat depleted. 

I love it as a concept and if you know someone who'd appreciate it, go buy one, you're supporting lovely people doing brilliant work. Oh... and it's fully opensource and OSHWA certified. 

Building Beautiful Things, RC2014 Mini II Picasso Ltd Edition

 

As a prelude to this post, I've stopped working, after a long time, for Tindie. No big story and you should definitely still browse and buy there. Other work and other commitments have taken priority and something had to give. I mention this as the kit in this post is an RC2014 product, if you don't know they make a range of retro computing Z80 kits. Not only that they have also spawned a load of add ons by all manner of makers. I know Spencer at RC2014 and so whenever I wrote up either a RC2014 product, or a product linked to RC2014 I had to declare an interest to my Tindie editor! So writing this post will feel unencumbered!

So yep, it's a GORGEOUS kit. These Mini II Picasso are a limited edition run and each individual kit will indeed be individual with no 2 having the same combination of PCB colour, silkscreen, LED colour, header colours etc. The kit is electronically the same as  Mini II but obviously the layout and design is spectacular. It's really nicely designed, oh, and it isn't rectangular! It's kind of shaped like a pint glass but it's hard to photo as it just looks like weird perspective. In case you don't know once built this kit can be run in a few different ways. The easiest is to grab an FTDI USB cable, hook it up and connect to this using a serial monitor, putty/minicom etc. Then, with some judicial placing of headers, you can boot into numerous environments, Microsoft Basic, CPM, CamelForth and more!

Back to the build though. The peculiarity doesn't stop at the weird shaped board and colours. There's some interesting techniques in this fun kit, some I have never done before like the sunken chip which uses a weird underside surface mount approach that is pure Picasso! Everything is a jaunty angle and yes those radial resistor arrays do have a shared hole! It really is fun, and actually no more complex than any other kit. It's supplied with a lovely lasercut set of upper and lower panels and indeed the upper panel has two choices one with access to the header sockets. I think it would be a slight challenge as a first soldering attempt, but as a second or third kit for someone it's very doable, with great instructions and there's a superb community of users online. If you fancy joining in go have a peruse of https://z80kits.com/shop/rc2014-mini-ii-picasso/