hey /diy/ so 6 months from now we need to submit a prototype of an automatic lawnmower. The point of the project is to make the AI reasonable and able to navigate relatively well. Problem is that out of our group of 4 people none of us have a lot of experience with with hardware or circuitry and what we have comes from house related labor. That's why i'm here, /r/ing any useful literature, contacts with people who've done or documented similar projects as well as general do and don'ts.
>>693681 yeah that doesn't quite do, the lawnmower needs to be autonomous. Also wouldn't gps be very imprecise, something like that shouldn't cross into the sidewalks or accidentaly drive off to the road. we contemplated on using some sort of light sensor system to figure out what's grass and what isn't, but we don't quite have the technical know how. What we do have is some funding from the university aswel as any tools they might have including a 3d printer
If its nicd, kind of Though this would charge them too quickly unless you throw a resister on the circuit
If its Li-ion or li-po No and I mean fucking no A laptop battery is made up of "cells" which is a fancy way of saying multiple batteries, in a li-ion/li-po battery each of these cells has to be balanced (charged to the same voltage) as eachother and must not go over 4.2v per cell or you risk fire or explosion
Best bet would be to tear open the old and the new battery and swap the good new cells into the old battery to bypass this proprietary bullshit
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I was disassembling the wood panels in my basement and behind one of them was pic related.The guy who built those panels in the 80s had made a socket for the junction box in the concrete wall so that it would fit behind the panel. But seems he had enough with hammering the wall off and decided to leave the box's lid off to make it fit there.
That is, in my opinion, so retarded that I had to take a picture of it for you guys.
Also, look at where the cable goes at the top left.
Just started a hydroponics experiment in my porch, i'll be updating weekly with its progress.
My setup consists of 4 deep water culture 5 gallon buckets housing 1 pepper plant and 3 tomatoes, for those of you that dont know, deep water culture is a way to grow plants with the roots submerged in a nutrient solution with an air stone aerating the water.
the pepper is a red bell pepper variety, the tomato on the left is a full size tomato and the two on the right are cherry tomatoes.
i'm using a 4-18-38 nutrient solution plus calcium nitrate (16-0-0) which bumps my solution to 20-18-38 plus epsom salt for best results, i chose this specific hydroponic fertilizer after watching a few videos on youtube from a guy called bobby, the man is your go to guy when it comes to hydro, he tested this fertilizer extensively with pretty crazy results: https://www.youtube.com/watch?v=TQzgMve9hoA
the fertilizer was purchased on ebay premixed to the correct ratio: http://www.ebay.com/itm/Hydroponics-Nutrient-Fertilizer-Tomato-Vegetable-Formula-2-Pounds-20-18-38-NPK-/171269107921?pt=Fertilizer_Soil_Amendments&hash=item27e06f30d1
since this fertilizer comes in a powder form it lasts for a LOT longer then the liquid nutrient solutions that come in a bottle, this 2 pound bag lasts for around 160 gallons of water.
the pic related was taken today after the plants have been in the solutions for 24 hours, as you can see, the tomato plant on the right is having a tough time, this is my fault, since its bucket was bigger then the others i decided to add more fertilizer but instead of measuring it out i just eye balled it and ended up with a solution that is too strong, i've since diluted it, we'll see if the plant bounces back.
(only had one air pump when taking this picture, i've since added another one so all 4 plants are getting aeration)
>>640840 this is the second setup, 3 heads of romain lettuce in a long garden pot with no holes at the button and with a foam cover with holes for the plants on top.
the lettuce is sitting in the same nutrient solution but this time i'm going with the kratky method of growing hydroponics, this method requires no air stone, you just let the roots sit in the nutrient solution and forget about them, the plants drink up the water so the level drops and exposes some of the roots to air, since the roots are also getting... Comment too long. Click here to view the full text.
>>633788 >university is throwing a bunch of shit out from an old storeroom >professor asks me if I want the frame of an old quadcopter, with motors but no controller >fuck yes >get to the storage place >maintenance workers had thrown the copter across the room and smashed it apart Oh well, at least I got four strong motors out of it, each about the size of my fist.... Comment too long. Click here to view the full text.
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