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- SianaG commented on Jason-B's instructable USB Dongle Elimination
- SianaG commented on leondo's instructable Custom Fitted 3D Print GlassesView Instructable »
Nothing speaks against getting lenses from a fitted frame and designing a new frame that has the exact same glass positions though, but it can be adjusted in the temple and nose area for more comfort though, right?Then again lots of things would likely work for me personally, because my lenses are essentially really strong horizontal cylinders, no spherical strength, nearly zero angles.
- SianaG commented on danleow's instructable How to upgrade your 2600mAh powerbank to 5000mAh
You are quite correct. The highest capacity 18650 size cells are approx. 3500-3600 mAh, made by Panasonic (ex Sanyo) and LG Chem. Which is honestly quite impressive already, i mean anything beyond approx. 1600-2000 is no longer terribly trivial, which is about how much you can expect from cells made by Chinese chemical companies, no matter how much they exaggerate.I'm not sure i'd take those cells of unknown origin even for free, i mean what it they grow a lithium dendrite inside and short out? There's still plenty of energy in there to make the consequences uncomfortable.
View Instructable »Perhaps instead of parallel, you accidentally connected them antiparallel, i.e. plus to minus and minus to plus. This is actually a short circuited series connection, causing the maximum possible current to flow, as much as the cells will emit. However, between the common terminals, the voltage is close to 0V, so there was no electrical damage to charge controller.That the wires got red hot means that the cells took thermal damage too. Toss them away, you can no longer use them.Another possibilty is much less likely, that one of the cells gained high ESR and another low, due to repeated series charging without full balancing, causing a difference in apparent voltage when they were connected, which caused compensation currents to flow. But it's difficult, nearly impossible for that to occ…
see more » - SianaG commented on CalcProgrammer1's instructable How To Use a Nokia Color LCD!
Curious. I have not considered the possibility that they would use a colour gel to tint the display. Or that one could do that afterwards.Message center is a monochrome graphics LCD. You shall probably find some SMD LEDs on the board beneath it, that can be replaced. I am not familiar with specific display model employed, nor are there any data sheets - it has apparently been manufactured by Optrex Corporation, Japan, specifically for use by a division of General Motors, and has not been available generally or used anywhere else. Most companies wouldn't be caught dead ordering or a 45x28 LCD. For reference, the display model designation is DMF-50796H. If it's anything like i imagine it to be, there should be a metal shield retained by twisted tabs on a PCB, and merely removing the shield …
see more »View Instructable »Have you had luck with your project? I am not familiar, but it appears the display in such vehicles is usually not an LCD of any kind, but a vacuum fluorescent discharge tube display, VFD. It's a collection of thin shaped glass vacuum tubes that are coated with a Luminophore on the inside that determines their colour; correspondingly, while they can be manufactured in various colour, their colour can not be changed afterwards. I am not aware of any possibility to get a custom one-off VFD made for you.It's possible to reverse engineer the signals driving the display, and then create a drop in replacement, based on a microcontroller interpreting the signal and driving a graphic display of some kind, an LCD or OLED. With OLED, there is the question of suitability to vehicle use. The displays…
see more » - SianaG commented on sgomes3's instructable Voltage Regulated [5v] Bicycle Dynamo Light & USB Charger
Do i read you correctly, you're attaching a 12V battery (DC) instead of dynamo (AC)? Then yes, you don't need the rectifier portion. You also don't necessarily need the capacitor C1, because the battery has a low enough ESR, but if you already have it, you can leave it in.In order to charge smartphones and tablets via USB, the port that you connect them to must identify as a USB host or as a charger.To implement simple charger identification according to USB 2.0 SDP (limit: 500mA or 100mA, device dependent), connect D+ to GND via 15 kOhm resistor and D- to GND via 15 kOhm resistor.To implement simple charger identification according to Battery Charging Specification, connect D+ to D- straight or through 200 Ohm resistor (depending on version), current limit: 1.5A.To trick Apple devices in…
see more »View Instructable »I think "600mA" is a filty lie and you shouldn't trust it. I think it'll do closer to 100mA on average, or less.
I know it's an old question, but you asked someone to reply if they stumble along, so here goes. You need to ground the SENSE pin of MicroUSB socket on OTG processors such as the one on Raspberry Pi, else the processor's USB controller is configured as peripheral endpoint port, not as a host controller.Also make sure to not confuse the fundamentally somewhat misnamed D+ and D- pins.Additionally USB HID devices, wireless dongles or directly wired, are LowSpeed devices with relaxed signal integrity requirements. Bluetooth dongle should be a FullSpeed device with somewhat more stringent requirements. It is recommended to not use loose wire but compliant cable and untangle only the last cm or so, as little as you need. If using loose wires, it's a good idea to twist them together. Length matc…
see more »I know it's an old question, but you asked someone to reply if they stumble along, so here goes. You need to ground the SENSE pin of MicroUSB socket on OTG processors such as the one on Raspberry Pi, else the processor's USB controller is configured as peripheral endpoint port, not as a host controller.Also make sure to not confuse the fundamentally somewhat misnamed D+ and D- pins.Additionally USB HID devices, wireless dongles or directly wired, are LowSpeed devices with relaxed signal integrity requirements. Bluetooth dongle should be a FullSpeed device with somewhat more stringent requirements. It is recommended to not use loose wire but compliant cable and untangle only the last cm or so, as little as you need. If using loose wires, it's a good idea to twist them together. Length matching is a good idea, but within a mm is plenty. But usually this is all reliability wankery and for the most part, even remarkably crude connections usually work or would work at least some of the time.