LilyPad 328 Main Board ATmega328P ATmega328 16M DIY Kit Micro USB ATtiny85 LilyTiny Main Board Buzzer WS2812 RGB TEMT6000 (1PCS ATMEGA328P)

I purchased this for a flashlight project I'm working on. I have a maximum internal diameter usable of 46mm. I actually cancelled another order in favor of ordering this, due to ship times. My mistake.This product is actually 50mm diameter despite the listing indicating that it's 25mm, which means I'll have to take out the hacksaw to make it fit, and if I felt like using a hacksaw I didn't need to specially order a round one to do it.Otherwise, it's functional. The board is pretty bare, which is great for low-power projects. You'll need an FTDI cable with the right pinout to use Arduino with it; I soldered a 6pin ISP, and it seems to work just fine. The onboard LED is clearly made to be as bright as humanly possible, perhaps so you can see the regular blinking of your indication from orbit or something. Not entirely useful to have an indication LED that hurts to look at, but these guys didn't design it they just cloned it. Including the lack of a silked pin 1 indication on either connector, which makes identifying pin 1 AFTER soldering a header on basically impossible.For what it's worth, it seems to ship with the Arduino bootloader and a 1-second LED blink sketch burned onto it. External 8mhz clock, no clock divider, 2.7v Brownout Detect, SPI/Reset enabled, no watchdog, $3C00 boot, etc etc.. (0xFF 0xDA 0xFD fuses)I'm giving it two stars because it works, but subtracting three because the listing's dimensions are wrong and I honestly can't use it for my project so I'm out cost PLUS the time to find and order the right part.

This is is completely different from what's pictured--I suspect they maybe just used photos from Arduino. Unlike a real Lilypad, this has tiny holes that I'm not going to be able to sew through. Which was the whole point of buying it. Unfortunately for me I was in the middle of a move when I ordered it and then took awhile to figure out where I'd packed it, so I missed the return window. Don't waste your money.