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Anybody else noticed that recently JLCPCB shipping seems snafu'd? The board makes it through the production process at the usual blazing speed, and the delivery by ePacket or DHL is normal speed. But in between it sits in "Waiting for Carrier to pick up" at JLCPCB for several days. Now I'm watching my finished order, with DHL shipping, about to hit the Chinese mid-Autumn holiday without making it out of JLCPCB's shipping dept.

Or was I just unlucky with my last few JLCPCB orders?

I've been using STM32 "blue pill" modules like this one successfully for a while. But a couple of new boards came that look like this. They are almost identical, except notice that the STM32 chip markings look a little different.

I tried loading the Arduino Maple USB bootloader using both ST-Link and serial programming methods, which appears to be successful (the results are the same using either programming method) but the application program doesn't run. ST-Link gives the message "Core is locked up!" when it tries to start the application program.

I've tried erasing the chip (ST-LINK_CLI.exe -c SWD -ME) which appears to work bu

Get back to work you scrubs. My orders are waiting for shipment!

So I toasted my STM32 Blue Pill by touching an unprotected capsense pin (analog input pin) when I was charged with static electricity, enough that I felt the zap. The effect was immediate and that pin has become forever dead. The Blue Pill still works otherwise (the other capsense pins still work).

To protect the capsense pins I am adding series resistance and clamp diodes to the touch inputs; [as shown in this schematic diagram] (https://imgur.com/a/omN7qZW). When the ESD comes in it goes through the BAS70 diode into ground and VCC.

My question is; do I also need a TVS diode (D1) across VCC and ground to keep the ESD from going in the VCC3V3 pin and causing havoc? Or is there little

Let's say I flip a coin and add 1 to a count if it's heads or subtract 1 if it's tails.

Is there any expectation of what the counter value will be over time? I mean like after thousands to millions of coin tosses.

I am trying to use this method as a test measurement to see if my random generator has any bias towards heads or tails over time. It's a truly random generator, not a pseudo-random sequence.

Really I expected more. But I can count the useful new features on two fingers. On the other hand V5 is slower, it crashes (V4 never ever crashed on me), errors pop up whenever I open a project, and it's wrecking my V4 projects.

The funniest joke is that I was expecting an improvement in the speed of some features. Nope, instead they added a progress bar popup that stalls for the first 20 seconds at 0% because it's even slower now.

Yeah sorry about the rant.

I have a TAZ 5 (Rambo 1.3 board, Hexagon hot end, stock software from Lulzbot). All of the sudden in the middle of a PLA print (205C) the hot end temperature went down about 50C. Not being hot enough to melt the plastic it started air printing.

The bed temp is accurate. The hot end temp is about 150C when set for 200C. Tried to fix it by replacing the hot end with a brand new one and the same effect is seen. Anybody seen this before? Is my Rambo 1.3 board somehow gone bad? That's all that's left to replace but I don't understand the failure mode.

What is this material (on the screws) and why do manufacturers put it on equipment screws? Pictures: http://i347.photobucket.com/albums/p469/tigercat6/image002_zpsw2jbejg8.jpg http://i347.photobucket.com/albums/p469/tigercat6/image001_zpsosvfukhw.jpg

How does this happen? The Qcoo project was at about $15,000 funding (of $30,000 goal) with 9 days to go. Then it jumped to $20,000 with just a couple of new backers. Hmmm, that seemed odd so I started screencapping it. Then with 7 days to go it jumps to over $30,000 with just 2 new backers and one $45 reward taken.

What's happening here, and is it normal?

Building an extreme low power device and need to select an ATtiny with sleep current around or below 1uA (at 4V). Is there any difference in the sleep current for the ATtiny45 vs the ATtiny85?