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This could be a very useful list for many of us!

Couple of alternatives, also multi-platform and free or free for hobbyist

Software - Visual Studio Code code/text editor
Hardware - For 3D. Fusion 360. Tried a few and very easy to get along with.

I don't know. I'd be inclined to suggest power - oftentimes ESP8266 weird resets seem to be power related. I can't make out the circuit diagram that well but you have a capacitor in there? What size? I think recommended min is 47uf. Does that say 0.1uf?

Maybe flash 1.87 to rule a bug rule out. My board is a D1 Mini. Running your exact code I'm into the 1000's on the counter, so your code is ok I'd suggest.

Which espruino version? Your code runs indefinitely for me using 1.87 and a dev board based on the same chip (either E or F).

How are you powering your 12F?

I missed the Nordic bit on Microbit as I was looked at the BBC website. Not being able to connect from it would limit it's utility though. Thanks for clarifying.

Am I interpreting the docs correctly in that Puck can be woken up on a mag event. I can adjust the sample rate down but I still get readings even when the puck is stationary. I'm wondering if this is because the readings - despite the puck not moving - are actually changing. They differ each reading by a very small amount.

Which leads me to ask, if this is the case and the small changes trigger a reading, can the sensitivity be turned down so that when it is stationary the Puck can sleep.

Should there be Puck v2 would it be practical to add an accelerometer? I'm guessing in the absence of one, the magnetometer could be used as a proxy for this sort of thing by detecting speed of reading change?

Also, my kids have acquired Microbits and I'm considering putting Espruino on them. Is any of the Puck BLE piece likely to make it's way into the Microbit espruino build? I had a brief look at the Microbit spec and it doesn't appear to be a Nordic chip so I'm guessing no or it would be a lot of work that's not worth doing given the user base?

Here you go

http://www.espruino.com/binaries/espruino_1v87_esp8266/

For anything earlier you will need @tve builds I think

You can see/grab later builds at /binaries level.

v1.87 is a good bet for ESP8266. AFAIK there hasn't been any ESP8266 specific development in the later versions. Earlier versions might not get you the 1700 jsVars which is where the ESP8266 port ended up.

a simple way to "power-cycle" the puck is to get your fingernail under the battery and lift it slightly from the PCB towards the springs of the metal clip.

Actually, that works very well. Thanks!

I think something similar has been asked and I think emulating a keyboard was the advice offered. There's a tutorial on that here:

http://www.espruino.com/Puck.js

I think the breakout board & jacket ideas are very good, particularly the serial connection - that should be in my original list - monitoring what your program is doing isn't easy since we need to disconnect for any Bluetooth application

I didn't adjust anything - wasn't aware I needed to TBH. I'll check out the post you link and give it another shot.

Love my Pucks, let me say up front that @Gordon has done a fabulous job and I know it's a work in progress. But there are some issues I'm contending with.

1. Battery out. It's not obvious how often you'll need to do this at first. But you will. The battery is hard to remove. A reset/power down button would be good - or better access to battery.

2. Flashing. Reverting to Apple/Android smartphones to flash, seems like hard work. We could use a flash routine via the IDE or similar desktop tool, where we are programming the Puck.

3. Hub software. My eyes glaze over when I see the setup routine for that on a Raspberry Pi. A few have set it up and had no luck running it. I think someone has forked it and had some success. It just seems hard for the sort of person who might buy a Puck - when open to all - commercially. Again I understand this was a stretch goal of the Kickstarter, so the current incarnation isn't what it might look like eventually, but I'm interested in where this project might end up and whether there are other tools available.

Unrelated but relevant...

1. Builds. Some, such as ESP8266 build, seem to have broken. I know this is not mainline, but I understood the ESP8266 specifics were pretty stable. I've no idea if Puck additions have impacted the build for ESP8266, but it correlates. We'd all like the latest version of Espruino however we are using it.
   

@bendennis I have solid green when I try this. Console reports bearings within the green range, but I don't think they should be. I'm changing all orientations.

That's made my year ;)

As an aside, I started with the ESP8266-01 boards but eventually left them alone in favour of ESP8266-12 boards, or more specifically, development boards like the NodeMCU.

01 has really limited pin outs, less flash and you need to supply the power via FTDI and faff with flashing routines.

My current favourite is the D1 Mini (and replicas of). It's tiny and comes with pin header but you decide whether to solder it.

The NodeMCU is probably the best board in terms of exposing ESP8266 pins but it comes with pre-soldered pin header - great for breadboarding but it you want to use it in your application you need to pull all that out to keep it small.

Hope that's useful. Glad you are up and running!

Puck enters DFU mode for flashing. I'm not familiar with the code but maybe UART service is not available/advertised in this mode?

In any event I don't believe it is currently possible to update firmware using this approach. Get hold of nRF Toolbox app for iOS and Android.

Obviously breadboards are your friend, but maybe converse with @DrAzzy who designs breakout style boards for Espruino. If you are struggling others could be too, in which case maybe he can assist.

@Fisu Nice! I've tried it.

That's similar to an issue someone else was having today with a new build of Espruino on ESP8266-01. Maybe try 1.87 build. I wonder if something broken in the build.

I think 47uF is recommended in the docs but you can go bigger. I think I might have used 100uF

I haven't looked at the source, but I doubt has to be a Pi. Probably Pi easy as cheap and has built in bluetooth (model 3)

Maybe try the capacitor, between VCC and GND. Also without being connected to wifi - do you have more success loading a sketch?

There's a tutorial here: http://www.espruino.com/Puck.js+HTTP+Proxy

Getting the bluetooth Hub up on a Pi is covered in the README of the repo here: https://github.com/espruino/EspruinoHub

I'm going to say power is unstable/insufficient.

Do you have a capacitor between GND and 3.3v on the ESP8266-01? It's been a while since I used an 01 but I the thing did keep resetting without the capacitor.