I’ve used them at a previous job years ago but my electronic project backlog over the past years is much longer than my completed projects log unfortunately and I haven’t been keeping up. That is a gorgeous low voltage part!
Oh yeah, big time nerd, currently learning to program the 10-cent RISCV CH32v003 microcontrollers using the open source chain made by cnLohr (CH32fun).
My current project is getting my 3d printing stuff all set up. I’m building a Voron V0.2 but I need to print some more parts for it, but other than that I only have an ender 3. So I’m modifying and tuning the Ender to produce high enough quality ABS/ASA parts for me to be satisfied using in the Voron. Not a difficult project per-se but I’m coming out of a depression that along with my day job taking time away led to a long period of not doing any projects, so this is meant to be a refresh for my project brain.
I also want to build an e-bike with a somewhat unconventional drive-train, where it’s configured like a series hybrid: pedals drive a generator which drive the motor with a boost added by the batteries. I got the idea because most e-bikes either use a pedal cadence sensor to activate automatic assist (cheap but the assist power doesn’t scale linearly with input power which I don’t love) or a power meter (expensive because they use strain gauges to measure torque at the pedals, but nice linear proportional assist). I have no idea if this idea will be better overall, I’m trading a torque sensor for a whole ass motor which won’t be light or cheap either, but the idea of it scratches my brain in a nice way :) Also, it means I don’t need a whole multi-speed chain drive to achieve different gear ratios between the pedals and the wheel.
Those little RISC-V micros seem sweet and the existence of open source toolchains for them makes me really happy! That sounds like a great project!
Damn, both projects are cool AF. I remember building a Prusa i3 clone some 10 years ago with a buddy, was nice (I regret that now, he turned out a Zionist lmao). And the bike thing sounds great, I’ve been trying to muster the courage to spot-weld 18650 batteries with nickel strips and a cheap aliexpress mini spot welder for such projects, but I’m afraid of setting myself on fire!!
If you manage to get either of those running, you could make a post at c/DIY, I’d love to scroll through it :)
Spot welding batteries seems simple enough but not wanting to start a lithium fire is always good motivation to get cautious. I think I’ve heard that double pulse spot welders are the best way to do it?
Do you have any projects for the batteries? Recycling cells or making custom packs?
Primarily making custom packs, just because you guarantee that you get good cells from a good supplier at a low price. When you buy ebike batteries, cheap ones are often with shitty cells, and expensive ones are just overpriced.
I think what I would get excited about is using different chemistries. Like LiFePO4 for the long lifespan and better temperature tolerance. Or LTO for super long lifespan and really fast charging. Most e-bike packs I see are standard NMC Li-ion chemistry. And yeah, a high quality LiFe pack I found was really expensive. I have some used/recycled LiFe battery packs that were cheap and had a low cycle count, they would probably be good candidates.
For LiFePO4 I’d just get one of these big bulky car-like batteries I guess, in a comparably more powerful ebike. Kinda turning it into a motorbike hahaha it’s just these big LiFePO4 batteries are so freaking cheap, they go for like 100€/kWh
If you’ve used NEXPERIA MOSFETs, as I have, you may want to read my comment on the issue
https://hexbear.net/comment/6583974
Oh hai! Another electronics nerd!
I’ve used them at a previous job years ago but my electronic project backlog over the past years is much longer than my completed projects log unfortunately and I haven’t been keeping up. That is a gorgeous low voltage part!
Oh yeah, big time nerd, currently learning to program the 10-cent RISCV CH32v003 microcontrollers using the open source chain made by cnLohr (CH32fun).
Any projects ongoing or in mind?
My current project is getting my 3d printing stuff all set up. I’m building a Voron V0.2 but I need to print some more parts for it, but other than that I only have an ender 3. So I’m modifying and tuning the Ender to produce high enough quality ABS/ASA parts for me to be satisfied using in the Voron. Not a difficult project per-se but I’m coming out of a depression that along with my day job taking time away led to a long period of not doing any projects, so this is meant to be a refresh for my project brain.
I also want to build an e-bike with a somewhat unconventional drive-train, where it’s configured like a series hybrid: pedals drive a generator which drive the motor with a boost added by the batteries. I got the idea because most e-bikes either use a pedal cadence sensor to activate automatic assist (cheap but the assist power doesn’t scale linearly with input power which I don’t love) or a power meter (expensive because they use strain gauges to measure torque at the pedals, but nice linear proportional assist). I have no idea if this idea will be better overall, I’m trading a torque sensor for a whole ass motor which won’t be light or cheap either, but the idea of it scratches my brain in a nice way :) Also, it means I don’t need a whole multi-speed chain drive to achieve different gear ratios between the pedals and the wheel.
Those little RISC-V micros seem sweet and the existence of open source toolchains for them makes me really happy! That sounds like a great project!
Damn, both projects are cool AF. I remember building a Prusa i3 clone some 10 years ago with a buddy, was nice (I regret that now, he turned out a Zionist lmao). And the bike thing sounds great, I’ve been trying to muster the courage to spot-weld 18650 batteries with nickel strips and a cheap aliexpress mini spot welder for such projects, but I’m afraid of setting myself on fire!!
If you manage to get either of those running, you could make a post at c/DIY, I’d love to scroll through it :)
Spot welding batteries seems simple enough but not wanting to start a lithium fire is always good motivation to get cautious. I think I’ve heard that double pulse spot welders are the best way to do it?
Do you have any projects for the batteries? Recycling cells or making custom packs?
Primarily making custom packs, just because you guarantee that you get good cells from a good supplier at a low price. When you buy ebike batteries, cheap ones are often with shitty cells, and expensive ones are just overpriced.
I think what I would get excited about is using different chemistries. Like LiFePO4 for the long lifespan and better temperature tolerance. Or LTO for super long lifespan and really fast charging. Most e-bike packs I see are standard NMC Li-ion chemistry. And yeah, a high quality LiFe pack I found was really expensive. I have some used/recycled LiFe battery packs that were cheap and had a low cycle count, they would probably be good candidates.
For LiFePO4 I’d just get one of these big bulky car-like batteries I guess, in a comparably more powerful ebike. Kinda turning it into a motorbike hahaha it’s just these big LiFePO4 batteries are so freaking cheap, they go for like 100€/kWh