raspberry pi – grouchyfarmer

Catching Up

Covid For Christmas – The Great Pi Famine -Lettuce In December – Weather – Dreams

Covid

So on Dec. 23 MrsGF got an unwelcome Christmas present, Covid. Don’t worry, she’s doing fine. She still has a nasty cough but she’s feeling much better and has been testing negative for two days now so we’re hoping it’s all over. Somehow I avoided coming down with it. I took precautions, staying in the basement most of the time, eating our meals separately, wearing N-95 mask whenever I was upstairs, etc. But even so I figured I’d come down with it too. Well, I still might. She’s been testing negative for 2 days now. They say that the incubation time for the current strain is about 2 – 4 days, so I’m not going to be able to relax much for another couple of days.

And me… I’m a hypochondriac. All through the pandemic, every time I coughed or sneezed or my head got stuffed up, I was convinced I had Covid myself. And I have some pretty nasty upper respiratory allergies on top of it, so I pretty much have mild symptoms that could be mistaken for the early stages of Covid all the time.

The Great Pi Famine

RaspberryPi 4. I’m still amazed that they can squeeze a complete quad core computer with 8 gig of RAM, hdmi video, sound, 4 usb ports and WiFi into a package this small. Storage on this one is a 128 gig micro-SD card.

If you’ve been following this blog for a while you know I like to fiddle around with electronic gadgets and gizmos and tinker and build stuff. One of the mainstays of the electronic tinkerers out there as a controller of electronic equipment of all types has been a tiny little single board computer called a Raspberry Pi. They’re available in a variety of types ranging from tiny little units that are used as controllers for a variety of gizmos, to a full blown Linux computer that’s smaller than a deck of cards, the Raspberry Pi 4 and now the new, more powerful Pi 5. There are four things that make them attractive. They’re small. Very small. They are designed to make it easy to interface them to the outside world in order to use them to control robots, motors, actuators of various types, collect data from sensors, etc. And three, they’re relatively easy to use, easy to program and enormously powerful for their size.

And the fourth thing, they were cheap. Like really cheap. The Pi 4 which is basically a full blown Linux (using a variation of Debian) computer with up to 8 gig of RAM, built in WiFi, HDMI video, USB 2 and USB3 ports sold for about $40 or even less. If you ever wanted to play around with Linux to see if it could be a viable replacement for the ever increasing horror that is Microsoft Windows, a Pi 4 is an easy and cheap way to do it. Just plug in a monitor, keyboard and mouse, get yourself a good introductory book on the Pi computers, and away you go.

Sidenote: I was just reading an article the other day that illustrated just how much computing technology had advanced in the last few decades. Someone pointed out that the Raspberry Pi 4 is six times more powerful than the original Cray 1 “super computer”.

Note that I used the past tense there. They were cheap. Then the pandemic hit, supply chain problems hit, demand for Pis increased because people were stuck at home and were looking for things to do, and, perhaps most importantly, the profiteers struck. Scalpers, profiteers, scammers and the like snapped up every Pi they could get their hands on, and then turned around and re-sold them for three, four times their original cost. I saw Pi 4s, a computer that sold for about $35 – $40 originally, being sold for $250 or more.

Pre pandemic I had a half dozen or more of the things laying around the house. But I gave them to a friend who was an electronics experimenter and solar power experimenter before the drought hit. Get them back from him? Yeah, well, he lives in Barcelona half the year so that ain’t gonna happen.

After the pandemic, when I couldn’t get them for a reasonable price any more, I switched to using Arduinos for the fiddling around I was doing. But while they and other microcontrollers are extremely useful and fun to play with, they aren’t computers.

But now prices have finally started to settle down. They’re still over priced when compared to what they were before the pandemic, about $75. But that’s cheap enough that I’m willing to get one and start playing around with it.

To make a long story short the nice fellow from UPS dropped one off here (two, actually) and I spent a couple of hours setting it up, updating the software and fiddling around with it last night. So you might be seeing some more stuff pop up here concerning Linux and the Pi in the future.

If you want to fiddle around with one of these yourself and you’re new to the Pi I’d recommend you get something like this from a company like CannaKit in the photo below.

No, I don’t get a kickback from CanaKit or anything like that. There are a lot of disreputable vendors out there, but I’ve bought stuff from CanaKit several times now and they provide exactly what they advertise, ship quickly and their prices, while a bit high, aren’t horrible.

It includes everything needed to get the thing up and running. The Pi 4, a power supply for it, HDMI cables to connect a monitor, a case for it along with a tiny cooling fan, heat sinks for the CPU and two other chips on the board, and a micro-SD card with the operating system pre-installed. It’s more expensive than buying a bare bones Pi but it has everything needed to get it operational. Just plug in a keyboard and mouse, and a monitor.

Lettuce In December

From about the end of may through September we had fresh greens whenever we wanted them out in the garden. All we had to do was go outside, clip off some of the lettuce mix we’d planted, and graze to our heart’s content. I really missed that. And then I was in the basement doing stuff and saw the little portable green house we used to start seedlings in the early spring with the grow lights and heater and thought why the hell aren’t we using that to grow some fresh greens? So we did. And this is what we ended up with.

We didn’t put in a lot because we weren’t sure it was going to work, but as you can see it worked very well indeed. We got more than enough for a couple of good sized salads plus a bit more. And yes, it tasted very, very good. 😊

Other Stuff

The PreciseRF magloop antenna continues to work surprisingly well for me. I was concerned about it’s survivability when set up out in the weather but it’s been holding up well despite the rain, snow and colder weather we’ve had. But the real test is yet to come when it gets really cold here. It’s been abnormally warm here all through December. Even now, on Jan. 3 at 4:30 AM, it’s 35 degrees out there. We’ll see what happens when it’s -30 and blizzard like conditions.

Weather

If we ever get cold weather, that is. Temperatures have been running well above normal here. I vividly remember one New Year’s Eve before MrsGF and I got married. When we got out of the pub where we’d spent the evening it was -34F with a stiff wind and everything, including the car, was frozen solid. We spent the night at a friend’s house and managed to get the car started the next morning, somehow.

It was brutally cold for weeks that January. On Jan 1 after I got back to the farm I had to put a new alternator on one of the tractors. It was so cold that the insulation on the wires the old alternator shattered when I bent them. I managed to get the tractor running well enough to pull it into the heifer barn and then close everything up. 30 or so young heifers put out a lot of heat and it was warm enough in there that I could get the job done. The heifers thought it was great fun. They were all crowded around watching me.

What’s Coming Up

I got a woodworking project going. This is a joint project by ES (Eldest Son) and myself. One of his hobbies is doing stained glass so I’m making a backlighted frame for a piece he did. That promises to turn out to be pretty interesting. More about that when it gets closer to completion. That’s still in the planning stage.

One thing, though, dear sweet lord has good quality lumber gotten expensive! I’ve been spoiled. Years and years ago I bought a whole pickup truck load of very good quality, kiln dried, white oak about 1 1/4 inches thick, 6 feet long and of various widths that ranged from 6″ up to 13″. That’s pretty much run out now so I had to actually go out and buy wood and prices of good quality, furniture grade hardwood are absolutely nuts.

I don’t really have plans for the Raspberry Pi. It’s something I wanted just to be able to play around with Linux and mess around with. If something develops from that I’ll let you know.

Dreams

Dreams are weird. At least mine are. I was up at 3 AM this morning and just couldn’t get back to sleep so I came out here dealt with my email and then started writing this up. I do vividly remember the dream I was having when I woke up. I rarely remember my dreams, but when I do they are often extremely vivid and detailed. This one was like that.

MrsGF and I were having dinner at a rather fancy restaurant with a very nice young couple from India. I have absolutely no idea who they were or why they were in this dream. Nice people, though.

When MrsGF and I left we went out into the parking lot and the car, my Buick, was gone. We thought we mis-remembered where we’d parked it so I pulled out my phone to use the app that tracks my car. And my phone didn’t work. It had been infected with some kind of malware that just kept cycling through obnoxious ads over and over again.

There was a strip mall nearby and a T-Mobile store was there so we walked over there. They were about the close but a nice young woman kept the place open. She got me a replacement phone right away, restored all my stuff and got the phone working. We went back to the parking lot and activated the tracking app and yeah, the car was gone. We called the police and they found it, and the thief, rather quickly.

Elon Musk had stolen it. He’d been at the table behind us and had overheard me making disparaging comments about how utterly hideous his “cybertruck” looked so he’d gotten huffy, hacked the electronic systems in my car and took it.

Still, it’s better than the vivid, realistic dream I had about painting the garage. That was the entire dream, painting the garage. That was it. It was so boring that I bored myself awake.

Cheap Amateur Radio. The FT-450D and holy s**t it’s cold! And some flowers and stuff

Okay, can we stop with this nonsense already? It’s only Nov 8, for pete’s sake! Normally we don’t get really cold weather and snow until mid to late December. Usually it’s in the mid 30s to low 40s this time of year and you can still go outside without freezing your bits off. Last night it was 10 degrees. Night before that it was 11 degrees. And snow? Really? A lot of years we’re lucky if we have snow by Christmas. In the last two weeks we’ve had a total of about 12 inches here. Most of that melted off, thank goodness, but now that the temperatures have plummeted it’s sticking around.

There’s so much we didn’t get done outside this fall. Between MrsGF’s knee surgery and everything else that’s been going on, I just didn’t have time to get everything done. I didn’t get some of the dahlias dug up, so those are probably going to be a total loss. Didn’t get any of the leaves raked because I was waiting for both the pear tree and the maple in the backyard to shed their leaves. Only they didn’t this year for some reason. It’s been a strange, strange autumn.

On the plus side, MrsGF’s Christmas cactus is in full bloom and it’s gorgeous. I know a lot of people who just can’t get these things to blossom no matter what they do, but MrsGF has a real knack with plants. I’m not sure what it is. I suspect she could take an old, half rotted twig, shove it in the ground, and in a few weeks it would turn into a healthy tree. This thing just keeps going and going. Some years it blooms twice.

And she has a rose bush in the living room this year, also in full blossom, in November. I don’t know how she does that, either. But it does make me grin like an idiot to have a rose in full bloom while it’s 10 degrees and snowy outside.

But I was really going to talk about amateur radio stuff when I started all of this so let’s get on with this…

Yaesu FT-450D hooked to the SCU-17 interface. It’s been in production for a while but it’s still one heck of a nice little radio for the money

Oh, before that, though, I thought I’d just throw this in even though it has nothing to do with the headline starting this off. This is what it looked like here on Oct 31 a little after 6 AM.

Now I know this is Wisconsin and the weather here is a bit, well, odd, but still, really? Ick.

Now, finally, the amateur radio stuff!

The Dilemma

Whenever I start talking to someone about amateur radio, whether they’re other amateur radio operators or people who know nothing at all about it, invariably the topic turns to cost, and it becomes clear immediately that a lot of people, including a lot of hams, think that amateur radio is way too expensive. A lot of people I know who would otherwise be interested in getting into the hobby think it’s so expensive they could never be able to afford it. And that simply isn’t true.

I can’t really blame them for thinking that because some of this equipment is indeed expensive. The top of the line transceivers that the manufacturers and owners love to show off can quickly push up into the $5,000+ range or more. The Kenwood TS-990 sells new for just under $8,000 and iCom makes one that sells for more than $12K, for heaven’s sake. Once you add in other things that you may think you need, if you believe the ads, like amplifiers, computers, morse code keys, etc. you can quickly end up sinking $15,000 or more in a top of the line set up.

But here’s something the manufacturers don’t want you to know:

You don’t need any of that high priced junk.

Seriously. You don’t. If you want to get on the air on the HF bands (shortwave) you don’t have to spend a fortune. That little Yaesu in that photo up there costs literally less than one tenth of what my TS-990 costs new, and to be perfectly honest, does everything you need. Granted, it doesn’t have all the bells and whistles the 990 has, doesn’t have the fancy displays and all that, but when it comes down to actually communicating, those bells and whistles aren’t really necessary and the 450 will do everything you need.

I was looking for a fairly full featured, small, full power (100 watts output), 12V powered transceiver to lug out to field day and special events or whenever I feel like it, in situations where the little low powered 818 wouldn’t do the job. I love that little 818, but let’s face it, with a maximum of 6 watts output (3 watts or less running digital), any kind of communications using it is going to depend more on luck than anything else. I ran across someone talking about the 450 and it sounded like a nice little transceiver so I looked into it more and decided it was just what I needed. It sells new for about $750 – $800 which is, as I said before, one tenth of the cost of my TS-990. You can find them used for about $500 or even less if you look around.

And for that price what you get is not some stripped down little radio, either. This thing has a lot of features, including a built in antenna tuner, decent filtering, good noise reduction features, etc. In fact, just about everything you might need in an HF transceiver is packed into this little unit. True, it doesn’t have many of the goodies my 990 has, but I have to admit that in real life I don’t use a lot of those goodies anyway. If this were the only transceiver I had, I would be more than satisfied with its capabilities.

But for me the main question was how well was it going to work using digital modes like PSK, FT8 and JS8Call because those are pretty much the only modes I use. And it turned out it deals with digital very, very well indeed. It took me all of 10 minutes to get it up and running with the SCU-17 you see sitting on top of it in that photo. It was just a matter of plugging in the cables, setting the baud rate in the menu, firing up the computer and setting things up in the software there, and I was on the air. Now granted I had only just fairly recently set up the Yaesu 818 with the same interface, computer and software, so I already had experience working with Yaesu equipment which certainly made it easier. But still, for me, getting a rig up and running on digital modes in under 10 minutes is a bit of a miracle, really. It took me days to get my TS-2000 working properly with digital modes when I first started this years ago.

It’s currently set up in the basement, hooked to the Titan Gap vertical antenna, and it’s been doing a very, very nice job. I’ve made contacts all over the place with it using JS8 and FT8, putting out about 40 watts.

Sidenote: The 450 may be capable of putting out 100 watts, but you never run full power in the digital modes on any transceiver because the power ratings of all transceivers are seriously misleading. Those maximum power ratings they give you are for single side band, which does not stress the transmitter in the radio. With SSB you’re actually averaging far less power output than advertised. Your signal may peak at 100 watts, but you’re actually averaging 50 – 60 watts or so because of how SSB works. Unlike SSB, most digital modes are considered to be 100% duty cycle. A general rule of thumb is when using digital, always dial your power levels back to less than 50% of the radio’s maximum. Sometimes the recommendations are as low as 25%. Otherwise you risk overheating the radio and damaging it.

Anyway, I’m very pleased with this little radio. I didn’t really expect much from it when I got it, and it has certainly exceeded all of my expectations. I’ve been having a lot of fun with it, and I’ve been using it more than my TS-990 of late.

Lets see, what else? Oh, yeah. This showed up courtsey of our friendly UPS delivery person the other day.

I picked up a Raspberry Pi 4 to play with to join the RPi 3s I’ve already been playing with. I have a specific goal for this one. There are Linux versions of FT8 and JS8Call that, I’m told, run just fine and dandy on the RPi. I’ll find out this winter as I experiment. My eventual goal is to put together a compact QRP digital system that is backpackable that I can take along when I’m out on the trails with the bicycle. I’d thought about configuring the Rpi as a tablet computer with just a touch screen and no keyboard. I’ve done that before with the Rpi3s I’ve had, but I think that might be a bit awkward, so I’m looking at compact keyboards and maybe a small trackball or touchpad for mouse control. We’ll see. This is still very much a work in progress.

I know, I know… The used Lenovo laptop I picked up was supposed to serve that role, and it does, but while it works just fine it is also big, heavy and clumsy to lug around. I can squeeze a RPi into a package not much bigger than a small tablet computer and a fraction of the weight. We’ll see how it goes.

And that’s about it for now. I’ve been boring you long enough with this.