|
I'd never thought about this before, but you're right it's not that intuitive. Something I'll have to keep in mind when training people up in future. It is at least consistent with diodes, which also generally mark the cathode on the part - though usually the footprint has a mark on the cathode too
|
#
¿
Jan 26, 2024 23:47
|
|
|
|
| # ¿ May 9, 2024 10:14 |
|
|
Skinnymansbeerbelly posted:Why use something off the shelf when I can make something super jank instead? I think I'm going to ESPhome it as there are other environmental sensors I want to throw on. Are there any pitfalls I should be aware of using an LTC4311 to extend the i2c bus a couple yards out? I2C* was designed to never leave a circuit board, so there are a lot of pitfalls, but if you stay within what that LTC chip says it can do you'll probably get away with it. Just make sure your software can handle the occasional bit of messed up i2c traffic. I^2C, Is IIC for inter-IC - it's specifically designed for communication between two ICs on the same pcb. It doesn't have any of the features that communication protocols designed for inter-device protocols have. RS485, CAN, USB, ethernet, RS232 are all more reliable options but obviously will complicate your design.
|
|
#
¿
Jan 30, 2024 13:21
|
|
|
Rescue Toaster posted:I mean I'm not cranking on it or anything. But if the pads are completely clean, I can't exactly hold part, hold soldering iron, and apply solder all at the same time. I don't have 3 arms. This is how I do it too. It does sound like you just need better tweezers. It's hard to predict but sometimes tweezers work and sometimes they are weirdly sticky or slippery. I'm definitely going to pick up a pair of those titanium ones they look great
|
|
#
¿
Feb 7, 2024 23:45
|
|
|
Shame Boy posted:You'd need to know what kind of vapors that smell is made of first, but there's plenty of sensors that can detect basic molecules like CO concentration or volatile organic compounds or something like that that might work Yeah surely the easiest way is to just detect the car itself. When the car arrives, start a timer and turn it off after that. To detect a car you could use a distance sensor of any kind (IR reflective, IR beam break, ultrasonic, you name it), or something in the car (eg some kind of transponder, or an RFID tag - you can get systems that operate at a reasonable distance). You could also detect the state of the garage door using a similarly wide number of options. You could even detect yourself! Something like when your mobile joins the wifi, kick on the purifier for X time. This only works if you're only leaving via the car and only people who's phones you can ID are using the garage. All of those are going to be way cheaper, more reliable, and ultimately simpler than trying to detect exhaust gasses. However, gas detection is dope so if you want to do it that way because it's cool then more power to you, and please continue posting about the project as it's a fun one!
|
|
#
¿
Mar 24, 2024 22:27
|
|
|
LimaBiker posted:Also check to see if the cell isn't deep discharged. Sometimes the charger locks out in such a case. I think it could just be this - if it was switched on and charging, the LEDs probably used more current than the battery was receiving from the charger, so despite being "on charge" it went flat. This could be because it didn't correctly ask the laptop power supply for 5V 1A with the proper USB process, so the laptop followed the USB spec and only have it 250mA. This is a common issue for cheap electronics as they don't want to pay for a chip to do USB power negotiations, so both the charger and device just offer 1A without the negotiation. I can't think of any reason why that charger would've damaged the device though. I think it's extremely unlikely the laptop charger put out more than 5V - the USB PD spec is designed specifically to stop that happening, and USB laptop power supplies are either compliant or need to be recalled.
|
|
#
¿
Apr 28, 2024 04:56
|
|
|
|
| # ¿ May 9, 2024 10:14 |
|
|
Foxfire_ posted:Anyone want to offer opinions on workspace organization stuff they like/hate? My work is moving offices and I have a chance to change things around. Put side cutters and tweezers in the "your own poo poo" toolboxes. People always try and use side cutters to cut through fuckin bike locks or something and ruin the blade edge. Similarly they use tweezers as crowbars and gently caress up the tips. I've just implemented a similar system for smd components (ESD bags in small boxes), so far so good, but a bit too soon to tell. The rest sounds great, take a photo when it's done if you can!
|
|
#
¿
May 5, 2024 06:07
|
|