/robowaifu/ - DIY Robot Wives

Advancing robotics to a point where anime catgrill meidos in tiny miniskirts are a reality.

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Welcome to /robowaifu/, the exotic AI tavern where intrepid adventurers gather to swap loot & old war stories...

Batteries & Power Robowaifu Technician 09/09/2019 (Mon) 06:21:14 No.23
Robowaifus will need power to run, and since they will be mobile this means a mobile power system too. ITT post info on batteries and other mobility capable power systems.
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This university research project aims to make recharging your power system as quick as refilling a tank of special electrolytes. While it's aimed at the automotive industry, maybe it will have importance to the robowaifu industry as well.

While being an overall cool advancement, I don't think robowaifu's will really need fast charging capabilities. After all what else would she be doing while "asleep"
In the sixth Chobits episode, 'Chii Weakens' charging you're robowaifu (ie, getting Chii's master Hideki to learn that he even needs to) is the topic, and when the landlady (secretly Chii's mom) finally begins charging her up for Hideki, the implication is that she's charging up super fast. But then again, she's a super robowaifu, so maybe that's expected.

As to 'what else would she be doing' [at night], I may hear the sound of /clang/ing off in the distance heh. Sometimes she just might need a quick recharge tbh.
Edited last time by Chobitsu on 09/26/2019 (Thu) 17:45:34.
How about a bio-reactor that used microbes to generate energy? Bonus: you could have dinner with your waifu.
That's an interesting idea anon. Have any info links?

>Bonus: you could have dinner with your waifu.
>inb4 robowaifu farting ala the Bicentennial Man scene
Samsung claims this tech will charge 5x faster, and store 45% more energy per volume.
>In theory, a battery based on the “graphene ball” material requires only 12 minutes to fully charge. Additionally, the battery can maintain a highly stable 60 degree Celsius temperature, with stable battery temperatures particularly key for electric vehicles.

Hey guys, I've taken the plunge into learning how to use 18650 lithium ion batteries, they are world standard 3.7V rechargeable batteries used in cellphones and Teslas (which use thousands of them). I arrived at this decision since a casual browse of online shopping sites revealed more hits of 18650 battery holders and charge protection circuits than C battery cells, which I was going to originally use. C sized nickel cadmium batteries in particular are hard to find.

I also discovered the ESP32 is a 3.3V chip and can be powered by a single 18650 (in fact there's a version that comes with a battery holder and OLED built in), and two 18650 in series can provide sufficient voltage to the regulator powering the other type of Arduino boards.

Note that these batteries are particular and will be damaged if overcharged or undercharged, hence the necessary (but dirt cheap) protection circuits, picture is a one-cell 1A USB-powered one and a two-celled one that I'll have to somehow hook up to a 9V charger with enough amperage. In the meantime I can charge each individually via USB and I'll put a hardware battery level indicator in my waifubot.
Forgot to mention the newer version of the TP4056 03962A has OUT + - which you can connect to a load already, since not only does it have overcharge protection (i.e. the older versions) but also undercharge protection.
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>I also discovered the ESP32 is a 3.3V chip and can be powered by a single 18650
I was just looking into this too recently. While possible, like you say, it seems most people recommend going up to 2S to get 7.4~6V over the discharge cycle, then using a 90+ efficiency switching regulator to bring it down to the 3.3V you need, plus another for 5V or 6V for motors or whatnot. The problem with a 1S direct connection isn't so much the low end of the cycle apparently, the 2.6~3.0V or whatever your particular board cuts off at, but rather the top end, 4.2~3.7V when charging/fully charged. Toasty.

Glad to finally see some non-theoretical battery discussion too, I'm working on my own battery pack and charging setup right now. Want to get the waifu hardware organized and off of my prototyping/research desk. Thinking either 2S2P or 2S3P. Pic related. Basically the same as yours. Same deal with the charger, I've got a 9V 1.3A charger here that's hopefully up the task. The product description says it wants 8.4V but I can regulate down to that.


So it looks like it will be 2SxP for sure for me then. Turns out the Orange Pi Zero cannot be powered with a regulated 3.3V supply via the 3.3V pins. Apparently those only exist to supply 100mA or so to peripheral sensors and whatnot. So now I've got the amusing situation of the 3.3V Pi and a 3.3V Arduino pro mini clone being powered with 5V (through the RAW pin on the mini). The 2 red FTDI boards have the 3.3V jumper in place too. Now I just got to get everything on a board with double sided tape or something, and the wires routed so I don't fry something with a loose 5V lead.


I see your standard lithium batteries being chosen, very practical. We also see some theoretical discussion, very interesting. Fuel cells may be worth looking into if you want an option that doesn't require plugging in your partner. I wonder what options will be most cost efficient, but certainly your partner if using lithium batteries can't be more costly to charge than an electric car. There is the matter of energy density however. Will there be room within your partner for sufficient energy packs to run them for a day? You may also want to make your system hot-swappable in case she starts running low on energy during a late evening out.

It may be worth it to study the power systems used for artificial hearts.
My first response for technical problems like this has always been, "how did biology solve it?"
In this case, it kind of didn't. Sleep isn't a charging cycle, as much as it is a cleaning time. Spend the less-productive night hours squirreled away, healing your body and indexing the day's memories and such. What people actually do to get their energy is eat and digest, and humans only store enough energy for about three days of actually doing things. When someone eats, they are getting all the energy from the storage of whatever they are eating. That's why you eat your own body weight in food in about a month, but it's split into a pound or two three times a day: the thing you're eating also didn't solve the energy storage problem, and you use energy almost as fast as you get it if you're an active person. It's like that all the way down to the plant level, when they use the sun's energy to turn ground-minerals into chemicals they can use.
Considering that billions of years of evolution managed to get energy storage for three days of activity, the best option probably is to have some form of on-site power generator and a steady supply of fuel, as it is much easier to generate power than store it. The reliance on fossil fuels is because they have something like 40 times the energy per kilogram of current batteries. Those biobatteries that >>797 mentioned show great potential if they can be miniaturized to fit inside of a torso.

As for artificial hearts, those work via "inductive coupling" - basically, if you have two conductors set up right, you can wirelessly transfer energy short distances, as in, a few feet at most. The transmission speed decreases very drastically with range. The heart is connected to one of the conductor (along with a rechargeable battery), while outside of the body is a much bigger battery connected to the other conductor. The rechargeable battery inside has only about half an hour of charge, almost all energy goes nonstop from the external battery to the heart. Inductive coupling can be used to transfer energy without breaking the skin, but doesn't have the flexibility to be much better than regular charging in terms of range, and takes up a lot more space, since a bigger conductor means faster power transfer at a much less efficient trade than bigger charging cables.
Any refinement possible on your '3-day energy storage based on evolution' model to account for motivated humans being able to go 40 days w/o food?

>inductive coupling
what if we made a wireless-charging futon for our robowaifus to sleep on overnights?
Could use some variety of flow battery if we're looking for in ingestion based model. Your waifu would require input of material in order to keep running however adding this new material would be quick and depending on volume could be rather convenient. As well I find the idea of my waifu having to "eat/drink" in a fashion like a live person to be appealing in some manner.
>As well I find the idea of my waifu having to "eat/drink" in a fashion like a live person to be appealing in some manner.
There's a social appeal to eating together with friends and loved ones anon. Watch the scene with K and Joi in Bladerunner 2049 and imagine instead that she was eating holographic food along with him. It becomes more charming to my thinking.
Here a long article about types of batteries: https://batteryuniversity.com/learn/article/types_of_lithium_ion Website itself is worth bookmarking: https://batteryuniversity.com/ Some video about some of the types (incomplete): https://youtu.be/LqgP16JQ24I Lithium-Ceramic: https://youtu.be/kJXRyWQgOY4 BMS diy: https://youtu.be/rT-1gvkFj60 LTO safety: https://youtu.be/XsrRDZxEFQE
>>4391 Excellent. Also, I appreciate the fact you took the time to post in the correct thread. Finding anything after the fact (especially weeks/months later) in off-topic threads can be like the proverbial needle in a haystack. Now, I can find this info from the catalog any day I please.
>related xpost >>4385 >>4386
>related crossposts (>>10664, >>10666)
>related xpost (>>10663)
>related xpost (>>10729)
Hydrogen is promoted by some Anons but it's worse than good batteries in terms of conversion efficiency, and much worse in terms of convenience and expense (at least in the scale of a single robowaifu's on-board power systems). But if you're interested in it, here's an interesting post on the topic. https://www.forbes.com/sites/quora/2018/05/08/what-are-the-pros-and-cons-of-using-hydrogen-to-generate-electricity/

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