I created a Node.js CLI for exporting & importing schema and data from DynamoDB tables. I didn’t find any other node tools for dumping table schema (structure, indexes etc), they all just dump data.
I bought a “Multi Battery Parallel Charging Board For DJI phantom3” on ebay, and I soldered on a deans female connector for connecting it to my iMax B6 charger.
Since the Phantom 3 battery is intelligent and has its charging circuitry in the battery itself, the iMax will just work as a voltage booster with an output of 18V. This is 0.5V more than the DJI charger provides but it seems to work. So anything that can output >3A ~17.5V should be able to replace the iMax.
- Connect iMax input to car cigarette connector
- Connect iMax output to the multi-charging board.
- Connect the Phantom battery to the board
- Choose Pb charge, 5.0A, 18.0V (9P)
- Turn the battery on right before long-pressing start on the iMax (by using the short-then-long-press sequence on the Phantom battery.)
- When the battery is full it will say CONNECTION BREAK, but this is because the intelligent battery circuit will disconnect itself when fully charged.
In the next version i will be using a cheap boost converter from ebay, like this:
Oslo city bike is a great system and I often jump on a bike. But sometimes I wanted to be able to quickly check the status of the bicycles in my neighbourhood from my computer without having to log in to the app on my phone. Oslobysykkel doesn’t have this information in their map, so I made a public map with live updated availability of the bikes.
Update: I see that oslobysykkel.no just updated their map to include availability at the very same time 😂
- M140 laser diode (<$30 on ebay)
- Aixiz module (<$3 on ebay)
- LED driver supplying 1-1.25A. I used this one (<$3): http://www.dx.com/p/18v-5w-cree-circuit-board-for-flashlights-16-8mm-5-5mm-26110
- Unscrew line/cross filter in front of lens on Aixiz module, if present.
- Remove existing red laser diode from Aixiz module by using a vise, some cloth and screws for pushing it out.
- Carefully insert new m140 laser diode using a vise and some cloth and screws for pushing it in by its base.
- Google “m140 pinout” to figure out the pins
- Solder the outputs from the LED driver module to the m140 + and - pins.
- Connect some voltage source to the module’s input, i used a 3S LiPo.
- Use laser safety goggles for the correct wavelength.
- Laser diodes are very sensitive to voltage transients and static electricity. This means that when handling and soldering the diode, keep the two pins shorted until it is completely soldered to the driver circuit, then disconnect the short. I used some tiny connector probes that clamped on to each pin.
- Keep the soldering quick. They don’t want high temperatures. Preferable mount the diode in a module before soldering (to ensure heatsinking)
I have always wanted to make a custom digital picture/multimedia frame showing things like beautiful earth porn videos from YouTube. For this you need a computer, like a Raspberry PI and an LCD monitor.
LCD monitors can be bought on ebay but they get a bit pricey if you want a bit of size (10”+), and you often need custom HDMI controllers for them. I had a couple of old EEEPCs lying around, and I figured an EEEPC would be a good fit. It has everything you need. Big slim LCD screen, slim motherboard, integrated WIFI and will boot off an SD card, and it’s environmentally friendly to recycle old stuff.
I made an HTML/js script that plays a youtube playlist randomly in fullscreen with an embedded player. Running chromium under incognito solves some problems, like preventing some caching and preventing crash message when not closed properly. Safebrowring causes periodic download of large files, which we do not want. –kiosk causes fullscreen.
Rip apart EEE PC and extract mainboard + LCD (well obviously don’t rip, but screw apart)
Careful with WIFI antenna, LCD cable and flatcables connected to the motherboard
Disconnect anything that is not needed. (camera, touchpad, keyboard, ++)
Solder a couple of wires with a push-button onto the existing power button pins.
I built a wooden case for my frame which holds the motherboard towards the back wood plate with some screws, keeping the heatsink metal plate that sat behind the keyboard in the Eee. The screen is screwed into the front frame which is fastened to the wooden supports on the sides.
I left big gaps in top & bottom in order to get air circulation, because I have removed the fan so there will be no active cooling.
Installed Ubuntu 14.04 (x86) on an SD card (using a Live USB created by UNetbootin)
During install add user admin, and ensure auto login is selected.
I set CPU to powersaving to keep the temp down, because I have no active cooling anymore. And disabled bluetooth (
rfkill 1). Add the following to
Ubuntu’s default ondemand boot script overrides our setting. Disable it. Run as root:
/etc/fstab, append option
noatime to root partition.
Set power button action to shutdown (prevents showing a dialog.) Run as root:
On your main computer:
On eeepc, run as root:
Startup Applications add
xrandr --display :0 --output LVDS1 --rotate inverted
- disable browser updates
- ubuntu disable compiz
- chrome screen tearing
I bought this fun toy, but it had a misaligned LED so i had to disassemble it to fix it. I took some pictures to share with the world, in case someone is curious about the components or inner workings of this alien anti-gravity technology.
See here for product demo: https://www.youtube.com/watch?v=W6SSY7ABJkw
PCB photos follow:
I was importing my photos from my iPhone to my MacBook running El Capitan, and I got errors saying some files were in an unrecognised format, and some pictures turned out completely weird.
What’s sad is that the Photos app though that the pictures got successfully imported (apparently there was no integrity check), and so it reported back to iPhone that it could delete the photos after the “successful” import (according to the checkbox in the import dialog.)
Guess I’ll have to manually delete each photo on the iPhone after manually checking that all photos are in fact imported successfully now…
Personal Hotspot disappeared from settings on iPhone when using a new SIM card? Googled for a solution but I didn’t find one. Seems that the problem was that the APN for personal hotspot wasn’t configured.
Mobile Data ->
Mobile Data Network
Set the same settings under section
Personal Hotspot as section
En ting som jeg syns mangler på finn.no er å kunne filtrere bort boligere med høye fellesutgifter, så jeg slang sammen en Chrome extension for å legge til ekstra funksjoner i finn, og forhåpentligvis spare deg og meg litt tid.