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IS1621N on BCK-08 PCB

Published January 19, 2010

In other cheap Chinese device news here’s DealExtreme p/n 8422 with the case removed, powered by a benchtop supply, peered to my Nexus One, and playing audio. I’m hoping to redo the output circuitry on this and put it in another case to make a decent Bluetooth audio device for connecting to either a home or car stereo. It runs off of 3.7 VDC and has an on-PCB antenna, so it should be pretty easy to work with.

The PCB contains an I.S.S.C. IS1621N and FM24C08B EEPROM, which likely contains the IS1621N’s config. I’ve requested the data sheet for the chip from I.S.S.C., so hopefully I’ll have that soon and can work on it. I’d also like to change the identifier string in the EEPROM, but I probably won’t touch that until I know what the IS1621N expects to find in other parts of it. I also hope to find an example implementation, as it should be easy to build off of that to get line level output.

Here’s a few more pictures of the board:

· Detail of the FM24C08B EEPROM which likely houses the config for the IS1621N on the BCK-08.
· Top / button side of the BCK-08 PCB.
· Bottom / component side of the BCK-08 PCB showing the I.S.S.C. IS1621N Bluetooth IC and FM24C08B EEPROM.

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TFXTDOL

Published January 19, 2010

I guess this is what I get for buying discount ZIF sockets on eBay: one “genuine” TFXTDOL-brand DIP28 ZIF socket. It’ll probably be fine, even though I had to fight with pins which are too wide for sockets and almost too wide for the drill holes in one of the SDrive NUXX prototype boards.

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Kenda Small Block Eight

Published January 18, 2010

A rep from Kenda was set up at Ray’s MTB on Saturday displaying all manner of tires, tubes, and such. Conveniently all tires were also available for sale, at US$20/each, which is quite a bit below retail. I’ve been wanting to try out the Small Block Eight (SB8), a small knob smooth-rolling tire good for hard pack surfaces, so I picked up a pair of them in 29″ x 2.1″, the only 29er size made.

The Nevegals (which came stock on the bike, front and rear) don’t roll particularly smoothly but supposedly offer great control. Following some online recommendations I fitted the SB8 on the rear of the bike, leaving the nice, big knobs up front for better control. We’ll see how this shakes out once I actually start riding the bike, but at least I’ve now got a few options to play with. If nothing else I’m sure I can sell the Nevegals and SB8s for a reasonable price to fund some other tires.

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Popcorn!

Published January 18, 2010

I am currently eating the popcorn pictured above, which was popped in in a pot on the stove, in a bit of veggie oil. It was then tossed with Penzy’s Brady Street Cheese Sprinkle and a bit of freshly ground chipotle. Yes, real chipotle, first cut up with scissors, then broken down in a blade mill, and finally finished in a mortar and pestle with a bit of salt.

I have also been strongly advised to substitute bacon grease for the veggie oil in the next batch. This seems like wise advise.

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CrankBrothers Shoe Shields

Published January 18, 2010

After hearing about CrankBrothers Shoe Shields from my friend Erik I decided to give them a try. There is a fair bit of wear on my shoes (photo) from the Eggbeater pedals that I use and these thin metal plates should head this off and keep the shoes functional for even longer. Priced at $10.99/pair (at the local ACF) it wasn’t worth trying to make my own, as I don’t have a ready source of stainless steel nor an easy way to make similar cuts.

When the replacement pedals (Eggbeater SLs – photo) for my failed Eggbeater MXRs arrived today I decided that while fitting them to the bike I’d also replace the cleats and fit the Shoe Shields. While new pedals and cleats will normally feel a bit nicer, the addition of the Shoe Shields and their smoothing out the bottom of the shoe to better-than-new condition made clipping and unclipping during a test ride feel wonderful. While I imagine they’ll stand up to wear, it’ll be interesting to see just how long they last.

If you’d like to see more photos of them, including the packaging, install directions, thickness, and detail of the materials used, check out my CrankBrothers Shoe Shields album.

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Ride Until Failure

Published January 17, 2010

Today I met up with Rob and some friends of his at the intersection of 22 Mile and Shelby, heading out for ride intended to go to Metro Beach and back. As the weather was forecasted to be a partly cloudy 38°F surprise in the middle of January we figured it’d be a good day for a long ride. We proceeded to ride at a decent clip up to Nick and Marty’s place in Mt. Clemens, stopped to fit chemical toe warmers, picked up Nick, Marty, Jon, and Bob, then continued on to Metro Beach. One guy who was with us since Shelby Township dropped off here, as he lived in Mt. Clemens and had brought his single speed set up at 32:18 and the sustained ~16 MPH ride out almost wore out his legs.

By the time we got to gazebo at Metro Beach (the end of the path) I realized that I hadn’t eaten enough this morning and I’d run out of glycogen. Despite having food (gels and good granola) available. this coupled with a bit of wearyness from yesterday’s trip to Ray’s had me questioning if I’d be able to make it all the way back home, including the last four miles before my house which are very rough, frozen sidewalks. Since Bob had parked at Nick and Marty’s he offered to drive me back to my place, which was a really wonderful favor, as making it all the way back home would have otherwise proved quite complicated. I guess the partial avocado (it was kinda rotted), bowl of oatmeal, cup of coffee, and pretzel bread / cheddar sandwich that I had for breakfast wasn’t quite enough calories for this ride.

All said, the total distance for today’s ride was 42.18 miles, averaging 13.3 MPH (peak 24 MPH) over 3:09:28 of moving time. With yesterday’s 15.7 miles, that puts this weekend up along a somewhat exceptional summer weekend. My legs are only slightly sore and I didn’t collapse, so I guess I’m doing all right.

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Ray’s MTB

Published January 17, 2010

I just got home from a trip down to Ray’s MTB in Cleveland, a really nice bike facility built into some old factories. We spent most of our time riding the the XC course, with stops in both the beginner and intermediate rooms, staying away from (but watching) the expert things, including some of the stuff that appears to be straight out of video games.

The trip worked out well, as I drove down Friday after work and split a room with Erik and Kristi. Lots of good food was had, and the weather was just about as nice as one could hope for in late January. Being above freezing put Ray’s building itself somewhere perfectly comfortable in shorts and light gloves/shirts.

At one point I let my front wheel slide while coming down a ramp and fell, but it only scuffed up my knee. The only other real problems were caused by other people, most notably kids on BMX/street bikes who can’t ride up hills but insist on riding the XC course. If they planned right it wouldn’t be a problem, but instead they’d stop part-way up hills, walk to the top, and stop. With the course being almost completely plywood it made stopping very difficult and restarting almost impossible. Then there were the collections of people who’d stop on any available mid-course platform, backing things up terribly…

That all said, this is definitely a place I’d like to visit again. Despite the few irritations riding there was a whole bunch of fun and quite a nice way to do some technical riding in the middle of winter. If you’d like to know more about it, head over to the Ray’s MTB website and check out the videos, maps, and things like that. There’s also a bunch of videos from there on YouTube. This video in particular shows a lot of the XC trail, even though it’s last year’s layout, which I’m told did not have nearly the number of lines (different route options) available now.

A few photos were taken today, but of those most ended up being crap. Here’s the few passable ones, including the one up top of the beginner room looking down from the place where one rides up a steep ramp into the ceiling/rafters:

· Erik’s bike, Kristi’s bike, and my bike in the hotel room when we went to Ray’s MTB in Cleveland.
· 24oz can of Colt 45 in my bike, in the hotel room. Works every time.
· Looking down from the ceiling in the beginner room of Ray’s MTB.

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Broken Specialized Water Bottle Cage

Published January 14, 2010

Last night while looking over my hard tail bike I noticed that the Specialized water bottle cage on the bike, purchased roughly two years ago, has broken. While the weld was cracked it didn’t completely let go until I gave it a gentle squeeze, splitting it open, as can be seen here and here.

It’s a good thing that the King Cage bottle cages arrived Tuesday, as I was able to drop one of those on the bike. While silver, which doesn’t match the bike very well, it should work well and not break. Finding the crack at home is also much better than having it come apart while riding, as this tends to cause water bottles to fall and be lost.

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Pretty, Pretty Metal

Published January 12, 2010

With today’s arrival of a Thomson X4 stem the handle bar on my new bike is now secured properly with a really wonderful looking stem. Well-machined parts are really beautiful. The stem also feels to be the right length and the black stem cap looks really good. And it’s made in the US! (Here’s a photo of the stem itself, just sitting on the workbench.)

The order that I’d placed with King Cage for some friends and I also arrived today (photo). In this order is a Iris cage, which is of a slightly different design than the standard water bottle cage. I’d purchased it for use with the previously mentioned Klean Kanteen, but it appears that the side loops don’t reach up to the shoulder of the bottle, so it’s only held in with friction (photo). I hope this isn’t a problem, but if it is I can always fall back on using a normal-ish bottle, which the Iris does hold quite securely around the indentation (photo). Or, worst case, I’ve got a spare regular King Cage-brand cage.

Now to wait for the pedals (should have shipped Monday) and the bike should be complete. I’ve also ordered a rather unique handlebar (Ragley Carnegie’s Bar) to try, but I’m not sure if I’ll fit that prior to the first single track ride this spring or not.

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Would You Like To Play A Game?

Published January 12, 2010

I remember reading articles like this (The Effects of a Global Thermonuclear War; 4th edition: escalation in 1988) when I was much younger, leading to lots of thinking about nuclear war and the inevitable, terrifying future. I can’t help but wonder how I would have ended up if I didn’t grow up with knowledge of the awesome power the world’s nations held and my awareness of completely helplessness in the face of it. At the time all I could do was hope that such a war never came to pass.

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