A couple of people have asked me about my presence-robot-in-a-lamp, libbybot – unsurprising at the moment maybe – so I’ve updated the code in github to use the most recent RTCMultiConnection (webRTC) library and done a general tidy up.
I gave a presentation at EMFCamp about it a couple of years ago – here are the slides:
I’ve been using MyNatureWatch setup on my bird table for ages now, and I really love it (you should try it). The standard setup is with a pi zero (though it works fine with other versions of the Pi too). I’ve used the recommended, very cheap, pi zero camera with it, and also the usual pi camera (you can fit it to a zero using a special cable). I got myself one of the newish high quality Pi cameras (you need a lens too, I got this one) to see if I could get some better pics.
I was asked on twitter how easy it is to set up with the HQ camera, so here are some quick notes on how I did it. Short answer – if you use the a recent version of the MyNatureWatch downloadable image it works just fine with no changes. If you are on the older version, you need to upgrade it, which is a bit fiddly because of the way it works (it creates its own wifi access point that you can connect to, so it’s never usually online). It’s perfectly doable with some fiddling, but you need to share your laptop’s network and use ssh.
MyNatureWatch Beta – this is much the easiest option. The beta is downloadable here (more details) and was some cool new features such as video. Just install as usual and connect the HQ camera using the zero cable (you’ll have to buy this separately, the HQ camera comes with an ordinary cable). It is a beta and I had a networking problem with it the first time I installed it (the second time it was fine). You could always put it on a new SD card if you don’t want to blat a working installation. Pimoroni have 32GB cards for £9.
The only fiddly bit after that is adjusting the focus. If you are not used to it, the high quality camera CCTV lens is a bit confusing, but it’s possible to lock all the rings so that you can set the focus while it’s in a less awkward position if you like. Here are the instructions for that (pages 9 and 10).
MyNatureWatcholder version – to make this work with the HQ camera you’ll need to be comfortable with sharing your computer’s network over USB, and with using ssh. Download the img here, and install on an SD card as usual. Then, connect the camera to the zero using the zero cable (we’ll need it connected to check things are working).
Next, share your network with the Pi. On a mac it’s like this:
You might not have the RNDIS/Ethernet gadget option there on yours – I just ticked all of them the first time and *handwave* it worked after a couple of tries.
Now connect your zero to your laptop using the zero’s USB port (not its power port) – we’re going to be using the zero as a gadget (which the MyNatureWatch people have already kindly set up for you).
Once it’s powered up as usual, use ssh to login to the pi, like this:
On a mac, you can always ssh in but can’t necessarily reach the internet from the device. Test that the internet works like this:
This sort of thing means it’s working:
PING www.google.com (188.8.131.52) 56(84) bytes of data.
64 bytes from lhr48s22-in-f4.1e100.net (184.108.40.206): icmp_seq=1 ttl=116 time=19.5 ms
64 bytes from lhr48s22-in-f4.1e100.net (220.127.116.11): icmp_seq=2 ttl=116 time=19.6 ms
If it just hangs, try unplugging the zero and trying again. I’ve no idea why it works sometimes and not others.
Once you have it working, stop mynaturewatch using the camera temporarily:
sudo systemctl stop nwcameraserver.service
and try taking a picture:
raspistill -o tmp.jpg
you should get this error:
mmal: Cannot read camera info, keeping the defaults for OV5647
mmal: mmal_vc_component_create: failed to create component 'vc.ril.camera' (1:ENOMEM)
mmal: mmal_component_create_core: could not create component 'vc.ril.camera' (1)
mmal: Failed to create camera component
mmal: main: Failed to create camera component
mmal: Camera is not detected. Please check carefully the camera module is installed correctly
Ok so now upgrade:
sudo apt-get update
sudo apt-get upgrade
you will get a warning about hostapd – click q when you see this. The whole upgrade took about 20 minutes for me.
reboot again, and then you should be able to use it as usual (i.e. connect to its own wifi access point etc).
The only fiddly bit after that is adjusting the focus. I used a gnome for that, but still sometimes get it wrong. If you are not used to it, the high quality camera CCTV lens is a bit confusing – it’s possible to lock all the rings so that you can set the focus while it’s in a less awkward position if you like. Here are the instructions for that (pages 9 and 10).
It works using chromium not the Zoom app (which only runs on x86, not ARM). I tested it with a two-person, two-video stream call. You need a screen (I happened to have a spare 7″ touchscreen). You also need a keyboard for the initial setup, and a mouse if you don’t have a touchscreen.
I wanted to stay away from the computer during a week off work so I had a plan to fix up some garden chairs whose wooden slats had gone rotten:
Looking more closely I realised the slats were riveted on. How do you get rivets off? I asked my hackspace buddies and Barney suggested drilling them out. They have an indentation in the back and you don’t have to drill very far to get them out.
The first chair took me two hours to drill out 15 rivets, and was a frustrating and sweaty experience. I checked YouTube to make sure I wasn’t doing anything stupid and tried a few different drill bits. My last chair today took 15 minutes, so! My amateurish top tips / reminder for me next time:
Find a drill bit the same size as the hole that the rivet’s gone though
Make sure it’s a tough drill bit, and not too pointy. You are trying to pop off the bottom end of the rivet – it comes off like a ring – and not drill a hole into the rivet itself.
Wear eye protection – there’s the potential for little bits of sharp metal to be flying around
Give it some welly – I found it was really fast once I started to put some pressure on the drill
Get the angle right – it seemed to work best when I was drilling exactly vertically down into to the rivet, and not at a slight angle.
Once drilled, you might need to pop them out with a screwdriver or something of the right width plus a hammer
You could try some user built tensorflow binaries – I tried this one, which seemed to corrupt my SD card, but not tried this one. Tensorflow 2 would be better to learn (the apis all changed between 1.4 and 2).