A rant and some facts and tips if you plan to use lead-acid batteries for solar energy storage. I have pretty good over solar power production over the day, and I want to store some and use it at night instead of just giving it away for free. But these batteries and the general setup is giving me headaches. If you like what you see, and want to help out making this sort of development and production possible in the future, please consider a small donation at: https://www.paypal.me/dherrendoerfer This helps a lot in keeping the channel and its content free and un-influenced. ... https://www.youtube.com/watch?v=vHPF2sRTGrY

This video is about the Robin 3D Printer This is some of the documentation I made while developing and constructing the Robin 3D Printer. The original aim of this project was to build a superior platform to plot and expose PCBs for rapid prototyping needs, but as the project itself grew I decided that I would attempt to build a 3D printer. It can still do all of the other things I wanted it for. Admitted, this is a very small 3D Printer with only 125 by 125mm printing area, but it can replicate all its parts but one, and I can just make that one smaller. The results, showing how well the design fitted for 3D printing are most astonishing (to me). The arduino firmware, as well as the 3D printer files, parts list and some documentation and instructions used for this will be available for download via github. !I've begun populating the repo, look below for the link.! See here: https://github.com/dherrendoerfer/The-Robin-3D-Printer-Project It is published under Creative Commons 1.0 and should be considered beta quality. If you like what you see, and want to help out making this sort of development and production possible in the future, please consider a small donation at: https://www.paypal.me/dherrendoerfer This helps a lot in keeping the channel and its content free and un-influenced. ... https://www.youtube.com/watch?v=fp5ks9XuW9g

Can you convert a single-hose portable AC unit to a double-hose setup and gain tons of efficiency ? Read on. The answer in short is yes. But it's way more complicated than just fixing a second hose to the back air inlet. But ! With this one you just need to attach a second hose securely. Done ! The final result is surprisingly effective, and beat my expectations. If you like what you see, and want to help out making this sort of development and production possible in the future, please consider a small donation at: https://www.paypal.me/dherrendoerfer This helps a lot in keeping the channel and its content free and un-influenced. ... https://www.youtube.com/watch?v=L0bIARzDZCc

AR.Drone2.0 + GoPro 100m high Today was one of the hottest days of 2012, despite the high wind, and after an encounter with a tree in autonomous mode, I decided to try for some altitude. This is the result, enjoy ! There are no comments in this video - the 100m apex is at 2:50 minutes into the video. Aftermath: The ambient temperature was 38deg Celsius, after landing I found the canopy had melted at the top and the LiPo had noticeably bulged - but returned to normal after 15 minutes in the fridge. ... https://www.youtube.com/watch?v=F9yn7fN_o00