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How to Build Your Own Anemometer Using Reed Switches, Hall Effect Sensor and Some Scraps on Nodemcu. - Part 1 - Hardware
Tool Demagnetizer and Magnetizer
1986 Raspberry Pi Video Doorbell
Nice project. I might have thrown in a diode (to prevent backfeed) between the boost converter and the output DC jack. That way, if someone decides to plug in an AC adapter to the barrel jack, it wouldn't fry your boost board (and maybe other things). You could also put in a fuse, although I suspect the boost boards have at least some sort of overcurrent protection.It never hurts to add a little extra protection to your circuit, even if you think you will be the only one using it. I have definitely fried things that I designed myself, simply because I forgot the polarity or something!
Wow, awesome job! I like your parts and tools collection, it's strangely similar to my own, even down to the watch!
Wow, nice build! How many "duds" did you get when ordering the cheap servos? I'm planning a project that will involve lots of them, so I'm curious.
Gesture Controlled Maze
NFC Lock - When a PCB Is Also the Buttons, the Antenna and More...
Wow, this is so cool! Thanks for including all the mathy antenna stuff.
Well, I actually used an FQP27P06 (which only comes in a huge TO220 package) because I was using perfboard, but I would recommend trying the AO3401A as an SMD replacement. I'm not 100% sure if all the obscure specs match, but it looks like it can handle the current the ESP8266 draws. Nice job on the PCBs!
Nice project! You could also use a MOSFET circuit to control power to the ESP8266, where the button push turns on the power, and the first thing the microcontroller does is pull an IO connected to the MOSFET gate high, essentially latching itself on. Then, as soon as it successfully completes its publish, it can turn the MOSFET off. This type of circuit uses zero power when not in use, which is far less than the ESP's deep sleep mode. Just my two cents ;)I used this circuit in my mailbox notifier, which theoretically should run for years on 2x Energizer Ultimate Lithium AA batteries. A button cell would of course have a shorter life, but you can save a ton of battery with this type of circuit if it's on standby for most of the time.
You can get WS2811 chips for much cheaper. I'm getting 100x of them for only $6.17 on aliexpress, although it's somewhat of a gamble whether they'll work or not...https://www.aliexpress.com/item/Free-shipping/32629521458.html?spm=a2g0s.13010208.99999999.346.22cd3c006H3FB0
Great project! I'd like to build as many as I can afford.BTW, looks like the Digikey link for resistors is for 33Ohm, not 330Ohm
Circuit Board Design Class
Yeah, I could be wrong, but it looks like that project is a web radio that also doubles as a BT speaker (receiving the audio).