Archive for February, 2010

Make: Electronics

Wednesday, February 24th, 2010

For about two months now, I’ve been spending most of my spare time reading and doing experiments out of Make: Electronics. My spare time has dwindled now that I’m back to teaching and taking classes. It’ll dwindle even more as I get into semester projects.

I’m now up to Experiment #16 in Make: Electronics; about half way through. I’ve learned a good bit, even though the book is definitely aimed at newbies. I have skipped a couple of experiments that didn’t seem like they offered enough new experience for the amount of effort they would require.

I would recommend the book to anyone with one disclaimer: be prepared to spend a lot on tools and supplies. I’m also not terribly fond of the author’s recurring intruder alarm example. I feel like he could have come up with a better project. On the other hand, I don’t know of a better hands-on, beginner’s guide to electronics.

For now, I’m suspending my efforts on the book to finish up my DDS-60 card. More on that soon.

Backpacking at Big Hill Pond State Park

Wednesday, February 10th, 2010

Back in late October, I went backpacking at Big Hill Pond State Park near Pocahontas, Tennessee, about two hours or so from Oxford. Yes, I’m a little late getting around to posting this. James Church, a fellow Computer Science geek and Eagle scout went with me. Here’s a map of the park (large PDF).

You can see all of my pictures here. I was pretty happy with my pictures, especially considering all these were taken with my Fuji point and shoot. You can view an enlarged version of any photo on this page by clicking on it.

Trees changing color across the lake, under a blue sky.

I did a lot of backpacking in my high school days, but this trip was my first in over ten years. I’ve done two 10 day treks in New Mexico and two multi-day trips on the Appalachian Trail, but that was all back when I was in shape from playing three sports.

Just before we left I weighed my pack and found it was just over 50 pounds. Never again. I made it, but there’s no reason to carry that much stuff. Next time my pack will be at or under 45lbs. Some people go a lot lighter, but I’m realistic enough to know 45lbs. is a pretty lofty goal for me.

One of the trail markers that guided the way.

One of the trail markers that guided the way.

We arrived at Big Hill Pond State Park on Friday around 5pm or so, with just enough daylight to make it the mile or so to our first campsite. Each campsite has a small cabin, which we were happy to use. For supper we had some homemade chili I had cooked the previous day. We played a rather lengthy game of chess which James eventually won.

Cabin

The cabin we stayed in the first night.

We got a late start Saturday morning, which was not good because we planned to walk about seven miles that day. Before lunch we walked through two different swamps. The second one had a mile long boardwalk that allowed us to walk right over the swamp. We ate lunch at the base of a 70′ observation tower that was formerly used as a fire tower. From there it was a quick three mile walk along some ridges to our campsite.

A view of Travis McNatt Lake, not far from our cabin on the second night.

A view of Travis McNatt Lake, not far from our cabin on the second night.

My MSR Dragonfly Stove setup to cook supper Saturday night.

My MSR Dragonfly Stove setup to cook supper Saturday night.

Several trees were completely orange or red, but there were some trees that were still completely green. I suspect another week or two would have been the peak of fall foliage there. Temperatures ranged from the sixties during the day to low thirties the second night. The forecast was so devoid of precipitation that I actually left my rain pants and gaiters at home. I did bring my rain jacket and pack cover, just in case.

Green and orange tree canopy.

Sunday morning we had a four mile walk around Travis McNatt Lake to get back to the car. We got a much earlier start than the previous day and made it back to the car by 11am.

One of the neat features of Big Hill Pond State Park is the train track that runs through it. It passes through in one of the more remote parts of the park. It’s a little surreal to see a modern train passing through what passes for wilderness in the eastern US. Big Hill Pond was actually “built” in 1853 when dirt was excavated to build a levee across the creek bottoms for the Memphis to Charleston Railroad. Today the track still goes to Memphis and actually parallels Poplar Avenue for quite a ways in east Memphis. Trains seem to pass through every couple of hours, day and night.

A train passing through the Big Hill Pond State Park wilderness.

A train passing through the Big Hill Pond State Park wilderness.

For a couple of desk jockeys we handled the physical exertion pretty well. Of course there weren’t many big elevation changes, which helped a lot. James was dragging a little at lunch time on Saturday. Lunch seemed to perk him up a bit and he made the rest of the hike fine, though he was pretty exhausted once we made it to the campsite. It didn’t hit me hard until Sunday morning. James had a skip in his step, but I was very happy to make it back to the car.

I had a great time and will definitely be planning another trip soon. However, I won’t go until I’m in better shape. I haven’t done much in that regard since the trip, but I just bought some new running shoes and I’m ready to get going.

I would definitely recommend Big Hill Pond State Park as a first backpacking trip or for someone like me who is doing their first trip in a long time. The cabins are great because you don’t have to worry about buying or carrying a tent. There isn’t much elevation change, it’s relatively remote, and the the scenery isn’t half bad.

PanaVise Junior

Thursday, February 4th, 2010

The other day I forgot to mention a very important part of my soldering gear: the PanaVise Junior. It’s a miniature vise. Its jaws have grooves that make it perfect for holding small circuit boards. The best part is that it’s only $16, with free shipping from Amazon. I wouldn’t solder without it.

PanaVise Junior in action

PanaVise Junior in action

PanaVise makes a whole series of vise bases and heads, and I’ll probably end up with several of their products, but Junior model is absolutely perfect for working on small circuit boards.

A similar product is the ubiquitous “third hand,” as seen here. I have one of those too, but I don’t use it nearly as often as the PanaVise Junior. Some people actually use them to hold to hold small circuit boards while working on them, but either their third hands are much sturdier than mine or they’re crazy. It’s nice for attaching connectors to wires and that sort of thing, but I wouldn’t say it’s essential. I got mine for $4-5 from an electronics supplier. For that price, it’s not a bad deal for occasional use.

Along the same lines, I have a pair of medical hemostats that I use for holding things. For instance, a lot of projects will require you to solder headers onto a circuit board. It’s virtually impossible to get the headers to stay where you want them. I use the hemostats to hold the headers while I solder one pin. Remove them, check for alignment, reclamp, and solder the far pin, then remove and solder all the other pins. It makes dealing with headers much easier. It got mine from SparkFun for a few dollars.