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Saturday, January 9th, 2016

Subject:Attack of the really quite pleasant bees
Time:3:59 pm.

We’ve had a bee swarm come past once before, but this one settled.

So we rang Tricia and Martin from the Wellington Beekeepers Assocation and set about collecting the swarm.

Andrea in a borrowed suit:

Terrorist? Or Burning Man? Or makeshift bee photographer?

Of course, the swarm was up a tree on the steepest and densest part of our place.

The bees were pretty relaxed, given that we’d just cut down the branch they’d chosen.

Tricia said this was the biggest swarm she’d seen – twenty-five to thirty thousand bees.

Success. They are off to frolic in the kanuka above Karori.

Originally published at Happyinmotion. Please leave any comments there.


Friday, January 1st, 2016

Subject:2016 so far
Time:11:48 am.

Nominal.

Originally published at Happyinmotion. Please leave any comments there.


Monday, December 7th, 2015

Subject:Mitochondrion Mark 5.3 further progress
Time:9:12 pm.

My new countersinking technique is unstoppable.

Originally published at Happyinmotion. Please leave any comments there.


Sunday, November 8th, 2015

Subject:Mitochondrion 5.3 progress
Time:9:17 pm.

Hmm… twenty one boards into a twenty five mm tube, with quarter mm clearances? I think I might mock that up with paper and cardboard, just to check nothing clashes.

So old school.

And then I’ll get all the circuit boards made and bits 3D printed and it’ll all just fit together, right? RIGHT?

[EDIT, eight hours later – Yeah, I’m really glad I did this before ordering the boards… ]

Originally published at Happyinmotion. Please leave any comments there.


Sunday, October 18th, 2015

Subject:Mitochondrion M5.2 pictures
Time:9:59 pm.

I finally got together with Grist for some pictures of the Mitochondrion Mark 5.2, my 800 LED glowstaff. After mending it after Burning Man, that is.

Images from the NZ flag competition. And of course, had to do Laser Kiwi – it’s the people’s choice!

Originally published at Happyinmotion. Please leave any comments there.


Tuesday, October 13th, 2015

Subject:New job
Time:8:56 pm.

I was helping someone to unload the dishwasher at work…

Her: “Thanks for helping.”
Me: “No problem, I like easily achieved tasks with clear outcomes.”
Her: “So why do you work in policy then?”
Me: “umm… I’ll get my coat.”

Which is a long-winded way of saying, for those who don’t know yet, I’ve left MPI and I’m now working for MBIE, managing their investments in materials and manufacturing research.

Originally published at Happyinmotion. Please leave any comments there.


Sunday, September 20th, 2015

Subject:Topp Country
Time:9:54 pm.

Andrea’s sister & niece, Johanna’s book on foraging, and the flowers in our garden were featured in this week’s episode of Topp Country, streamable from the TVNZ site (ours is the middle section, not the lavender or the roses).

For those of you outside of NZ, the Topp twins are country singers, activists, and comedians. They’re NZ icons.

And I’m going to try nasturtiums and fuschias in an omelette, once summer comes around again.

Originally published at Happyinmotion. Please leave any comments there.


Tuesday, September 15th, 2015

Subject:Bombproof battery-powered LED strip drivers (but not playa-proof)
Time:9:31 pm.

Goal

I wanted to give my Burning Man camp-mates LED strips for their bikes/clothes, running unique patterns, so I could find them in the dark. I wanted these to be bomb-proof and to last all night.

Results

They were bomb-proof. You could kick these across the room and you’re more likely to hurt your foot than the drivers. There were not, however, sufficiently dust-proof. The two that were used in people’s pockets or bags worked fine; the three that were on bikes all died due to dust in the switch.

Design specs

  • Power a metre of LED strip, 30 LEDs on the strip, at low brightness for eight hours, so about 10 Watt-hours of battery.
  • Simple battery management, so protected Li-ion cells, Nitecore 16340 cells, three off.
  • Display FastLED noise8 patterns from a physically small microcontroller, so a Teensy 3.1.
  • Run strips reliably, so power the strips with a steady 5 Volts from a dinky UBEC and feed data to the strips at 5 Volts so a 74LVC245 level shifter.
  • Bomb-proof, so a metal case and locking mini-XLR connectors with cable clamps.


What worked

  • Mechanically, these were solid. Metal boxes rule.
  • The cables survived unscathed. The REAN mini-XLR connectors have the best cable clamps that I have found. If you want, you can use these drivers as poi, the connection is that good.
  • The strips survived unscathed. For the joints between cable and strip, two things work for me. Firstly, cover the solder joints in flexible, rubbery adhesive. I used silicone bathroom sealant, other people use E6000. Secondly, cover the glue in lots of heat-shrink. Preferrably the adhesive-lined stuff. I like to build up the diameter of the cable to match the strip, so the outer heatshrink can grip both cable and strip. And do this before the sealant sets, so the shrinking squeezes around the solder joints.

What needs to be improved in the next version

(Of course there will be a next version.)

  • Dust-proofing: I’ll put them in a zip-loc plastic bag.
  • Better charging: These require the cells to be removed for charging. That’s a pain with one driver and I made five. I’ll be exploring charging in place via USB (e.g. using Onehorse’s high power Teensy add-on charger should allow for charging in three hours). This would also allow the use of power from an external USB battery.

  • Better power architecture: UBECs are good if you want to run the 5 Volt strips at full whack, but for anything wearable or battery powered, I’m always dropping the brightness down. Hence putting all the cells in parallel and driving the strips directly is the way to go.
  • Making sure the microcontroller is always controlling the LED strip: A frequent failure mode for me in other projects runs like this: on startup, the microcontroller takes 100 milliseconds to power on, set up all the software objects in sequence, and start issuing commands to the LED strip. The LED strip starts instantly on power up and flashes to fully power, drawing enough power to damage the UBEC or sag the battery to the power where the microcontroller browns out. This is more of a problem with longer strips than this application, but I find myself holding my breath each time I turn one of. The solution is a MOSFET between battery and strip, controlled by the microcontroller. That way, the strip is not powered up until the microcontroller is ready to control it.
  • A better switch: Dust-proof, of course, but also less prominent. These large switches were easy to find with your fingers if they were deep in a pocket. They were also far too easy to switch accidentally, just by random jostling.
  • A better indicator LED: Using an indicator LED in the switch has an unexpected failure mode – the indicator LED can come on when power is reaching the switch but not getting past it. Thus the switch lights on when everything but the switch off. Also, illuminated switches are annoyingly large. I’m thinking that the indicator LED should be separate from the switch and controlled by the Teensy. If I use a red & green combined LED, then that could also report battery status.

  • Better sockets: I’m in two minds about this. I love the mini-XLR form factor. It’s small, the connectors are grabbable, and they lock, meaning you can’t pull them out accidentally. However, they lock, meaning if you do catch the cable on something, they won’t release and something else will break. And the female sockets are huge. I’ve yet to find the perfect connector here.
  • Easier manufacturing: Separate sockets and switches are a pain. Making up the flying leads and fitting those into screw terminals is far more effort and time than just mounting the sockets directly on to the PCBs. Mounting the switch and status LED to the PCB should be easy. However, I’ve yet to find a mini-XLR socket that is board-mounted. And there’s a few other spots where tolerances are to tight for easy assembly. This was fiddly.

What would be nice to have

  • Wirelessly synchronising patterns between drivers when the people wearing them are close. We kept in synch by just turning them on at the same time. The patterns run a random sequence that’s actually the same each time. Clock drift was negligible over a night, but it did mean that if one driver accidentally got turned off, that one ended up out of synch.
  • Audio responsive. Onehorse’s digital microphone shield looks worth a try.

Building your own

I wouldn’t use this design again. Or rather, I’ve learnt enough from building these that I can see all the better ways to do it. But the info here may provide some inspiration and guideance.

Diptrace schematic and board

Order this board from OSH Park, if you must. It’s all through-hole, for easy assembly.

Bill of Materials
The case and switch came from Jaycar; the 16340 PCB-mount cell holders from Mr Positive; the UBEC from Hobby King; the rest was E14.

Drilling the case

  • Use the PCB as a template for locating where to drill the PCB mounting holes. Fix the mounting screws in place with nylon nuts between the PCB and the metal case. There isn’t room to turn the nuts to hold the PCB in place where the screws are next to the cell holders. I used spacers on the mounting screws so that the nuts where above the cell holders. This does mean you’ll need 25 mm long mounting screws. I used counter-sunk heads so the bottom of the box could be flat.
  • Mounting the socket needs careful alignment if the screw holding the socket isn’t to clash with the screw holding down the lid. I made up a quick drilling guide but it was still tight. And the lip of the lid needs filing to clear the retaining ring on the switch.

  • The lid has just enough space underneath that there’s room for the cells to pop out of their holders if you whack the box hard enough. Two layers of thin yoga mat foam glued under the lid prevent this from happening by keeping the cells in place.

Originally published at Happyinmotion. Please leave any comments there.


Sunday, September 13th, 2015

Subject:What we did on our holiday, now in pictures
Time:2:13 pm.

Originally published at Happyinmotion. Please leave any comments there.


Saturday, September 12th, 2015

Subject:Burning Man panoramas
Time:2:43 pm.

Deep playa, one morning before it got too hot and dusty:

Burn night, just inside the circle of art cars:

Sunrise the morning after, from the top of a Robot Heart art car in a heap of blankets and warm people:

Ambling home, complete with bonus Temple. They burned that one too though:

Originally published at Happyinmotion. Please leave any comments there.


Tuesday, September 8th, 2015

Subject:Burning Man: we survived
Time:2:52 pm.

In short, coz back in Vegas:

Burning Man – I was aiming to survive and I succeeded. I’m told this year was particularly hard. There was lots of this:

Highlights being camp mates, surprise tackle-hugging Kiwi, the Temple of Mazu burn, the deep playa, and all the pretties. Low points being the brutal dust storms, the heat, and the wind.

As for my LED projects:

  • The Mitochondrion lasted long enough for plenty of spinning and I didn’t see a better glow staff out there. Strips slowly failed, until only one of the four was working, at which point I put it away. Lesson: rebuild the power architecture to run strips direct from the batteries, no UBECs.
  • The Too Bright Hat was still working by the end, but the battery life slowly dropped from five hours to one. Playa dust is conductive enough that the isolation from the strip power supply to ground dropped from unmeasurably high to 30k Ohms. Lesson: lacquer the traces and seal the strips.
  • LED Strip Drivers: Bombproof, except for the switches. These were not dust proof. The two drivers that sat in people’s pockets were fine;the three on people’s bikes died. Lesson: Seal against dust, even if that’s just a ziploc bag.

When I get home, I’ll do detailed write-ups of the Hat and LED strip drivers. For now, we have to wash and then fly a fair chunk around the world.

Originally published at Happyinmotion. Please leave any comments there.


Monday, August 31st, 2015

Subject:Further into the heart of the American dream…
Time:6:07 pm.

…or something like that.

I got bad culture shock in SF (and still have more to write about that).

Then we went to Vegas. Oh Jesus.

So now we’re going to Burning Man…

Best part of Vegas was chilling with an old friend who works here. In her pool, in the ‘burbs.

Vegas pool party 20150830_184347

Totally chilled.

Oh, and if you need to contact me, it’ll have to wait.

Originally published at Happyinmotion. Please leave any comments there.


Sunday, August 30th, 2015

Subject:Birthday thoughts
Time:7:32 pm.

…after a Vegas birthday that took in two circus shows, one training session, and one visit to Walmart – it is connection that I value, not spectacle.

Also warmth.

Hence I am delighted by this present from Andrea, helped by Shyamtara, from a photo of me spinning the Mitochondrion Mark 4 at Kiwiburn in 2013 by Kellective.

image

I shall be wrapping myself in this at Burning Man.

Originally published at Happyinmotion. Please leave any comments there.


Thursday, August 27th, 2015

Subject:Random SF thoughts while I try to clarify how I feel about this place.
Time:2:05 pm.

SF Toast 20150826_104354

We caught up with a wonderful surfer/aerial friend at some cafe down by Ocean Beach. They had toast, apparently causing everyone to blame the techies. In their defense, it was very good toast.

It was like this:

As Andrea says, “you never see that the other way around – surfers carrying their skateboards”.

Saw sand dollars and a syringe on the beach.

Caught up with another lovely friend and went to the cafe at the de Young art gallery. It is entirely clad in bronze, because someone had too much money.

SF copper 20150823_155143

On the wall of the de Young was a huge copper slab ten foot tall listing their major donors. I could try to claim this as a piece of art that asks questions about the place of Art in America, but I have enough culture shock already.

Originally published at Happyinmotion. Please leave any comments there.


Wednesday, August 26th, 2015

Subject:Achievements unlocked!
Time:5:54 am.

SF 20150824_174444

✔ Drive in the USA
✔ Get cut up by a BMW
✔ Get cut up by a Lexus
✔ Get cut up by a white van
✔ Get cut up by a pickup with a bed full of rusty engine parts
✔ Catch a bus in the USA
✔ Catch a bus going in the right direction in the USA
✔ Be mistaken for a Canadian

Originally published at Happyinmotion. Please leave any comments there.


Monday, August 24th, 2015

Subject:Last minute Burner soldering
Time:5:31 pm.

Jez 20150823_194737

With Kellective.

SF looks like it does in the movies. The cultural presence is such that, even from far away as NZ, you kind of know what to expect, or at least there’s a pre-existing set of stereotypes that mediate your experience here. For example, the vegan cafe in Berkeley that’s full of hippy attitudes, the eye-wateringly expensive art gallery in the park, the white homeless people ranting about spirituality, the black homeless people giving you the side-eye.

The trick is going to be getting past that. Or is that the reality and does SF just have a global cultural presence because that’s where so much global culture comes from?

Originally published at Happyinmotion. Please leave any comments there.


Subject:San Fran
Time:5:21 am.

Incoherent jetlagged thoughts from Oakland:

SF is biz jets and crappy public transport.
Time from getting off a plane to seeing a hand gun: less than two minutes.
Hipster mac and cheese?
Sunny parks as lounges.
Lots of homeless people, mostly black, mostly not begging but just hanging around.
Drivers stopping for pedestrians and lots of bike parking.
This American flag towel wasn’t American enough, so they added an extra American flag in the eye of the eagle:
20150823_101434

Originally published at Happyinmotion. Please leave any comments there.


Wednesday, August 12th, 2015

Subject:Namespace clash, or why are these energetic Germans using #happyinmotion?
Time:8:02 am.

My alert for “happyinmotion” has been going nuts, with numerous German women jumping up and down:

A photo posted by Carolin (@caroli_in) on

A photo posted by @thats.the.secret on

Seems a deodourant company in Germany is running a competition called Die Rexona motion challenges, as explained by this German blogger. Hence they’re all over Twitter and Instagram.

Clearly, this is unacceptable, so I’ll be changing the name of this blog to www.52DRph0vtJT9pjoqXzgs0kJAt6McQH6AZpuzH9Tt3aC448i0sk40ci9hna0SBl1V.com.

Originally published at Happyinmotion. Please leave any comments there.


Subject:Namespace clash, or WTF are these energetic Germans using #happyinmotion?
Time:8:02 am.

My alert for “happyinmotion” has been going nuts, with numerous German women jumping up and down:

A photo posted by Carolin (@caroli_in) on

A photo posted by @thats.the.secret on

Seems a deodourant company in Germany is running a competition called Die Rexona motion challenges, as explained by this German blogger. Hence they’re all over Twitter and Instagram.

Clearly, this is unacceptable, so I’ll be changing the name of this blog to www.52DRph0vtJT9pjoqXzgs0kJAt6McQH6AZpuzH9Tt3aC448i0sk40ci9hna0SBl1V.com.

Originally published at Happyinmotion. Please leave any comments there.


Subject:Namespace clash, or WTF are these energetic Germans using #happyinmotion?
Time:8:02 am.

My alert for “happyinmotion” has been going nuts, with numerous German women jumping up and down:

A photo posted by Carolin (@caroli_in) on

A photo posted by @thats.the.secret on

Seems a deodourant company in Germany is running a competition called Die Rexona motion challenges, as explained by this German blogger.

Clearly, this is unacceptable, so I’ll be changing the name of this blog to www.52DRph0vtJT9pjoqXzgs0kJAt6McQH6AZpuzH9Tt3aC448i0sk40ci9hna0SBl1V.com.

Originally published at Happyinmotion. Please leave any comments there.


LiveJournal for happyinmotion.

View:User Info.
View:Friends.
View:Calendar.
View:Website (happyinmotion).
View:Memories.
You're looking at the latest 20 entries. Missed some entries? Then simply jump back 20 entries.