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I think you need to use " instead of ', see http://www.espruino.com/Modules

It's a library from 1v94 on. So probably you have an older version.

GSM and LTE are getting cheaper and cheaper: http://www.cnx-software.com/2017/07/26/h­ologram-lte-software-defined-global-netw­ork-for-cellular-iot-projects-starts-at-­0-40-per-month-per-device/
I prefer a smaller footprint than arduino. Why not Teensy? Or Adafruit Feather? Or something else with a lot of addon boards.

... or probably not if you have been there already.

Perhaps this helps: http://www.espruino.com/Puck.js+iBeacon (especially the last part)

... and a node.js implementation: https://github.com/landlessness/node-BNO­055

Adafruit Arduino Library: https://github.com/adafruit/Adafruit_BNO­055

Connect the grounds of both puck and neopixel. You don't need an isolator between, neopixels normally run with an input signal of 3.3V. Isolators tend to make a sine wave out of a rectangular wave pattern ;-)

Please read this first.

Don't say 'add an accelerometer' :) I may do a more expensive device
with a full 9DOF sensor in it at some point in the future, but not for
the standard Puck.js.

Well, I don't say 9DOF, but I say 'add an accelerometer to the magnetometer'. An LSM303C or something similar to replace the MAG3110. We wold get proper compass and freefall/motion detection functionality.
Shouldnt't cost that much. Could LGA-12 be a problem?

Although i don't need it, this kind of efforts are always worth a donation. $5 sent.
p.s. it's easy, just hit http://www.espruino.com/Donate .

@Gordon Why not something like this below

Perhaps this: https://www.u-blox.com/de/product/b200-n­ina-b1
Edit: as a starting Point.

android: settings > apps > dropbox > reset "standard actions".
But honestly, this is not an android support forum ;-)

Go for the Sentral Coprozessor. Ultralow power consumption. https://www.tindie.com/products/onehorse­/ultimate-sensor-fusion-solution/?pt=ac_­prod_search

I think the problem lies in your code: var nfc = require("MFRC522").connect(SPI1, B1/CS/);

B1/CS/ is not a pin, use just B1, (/* .... */ is a comment, with missing stars its not!). Presuming that you really connected Pico Pin B1 to the modules CS pin (probably NSS for your board).

Your code AND schematics would help a lot ;-)

Have a look at the drawing. A and B are the encoder outputs and C the Vcc of the encoder (use it with the espruino encoder module). Pins 1 - 5 are for the three led's (1|2|4), the button (3) and Vcc (5).

@Eric - thanks ;-)

@Eric - Cannot find that shield/jacket thread. Hint ?

Edit:
About LiPo (or better LiFePO) have a look here.

Everything you need to know is here.

Thank you @François. I've stopped "peeking and pokeing" with that ADB stuff, so I wait to get home and use my Nvidia Shield tablet. It's a bit annoying using the WebIDE with a 4.3 ich screen ;-)

Tried to use the WebIDE with an Android handy and a puck. Followed @Gordon 's directions. Everything okay until "Web Bluetooth" port selection dialog. But then "Connection failed". Puck is okay, i can see it on the same handy with other tools (ie nRF Connect from Nordic).

Any idea?

Environment: Sony Xperia Z1 Compact (2014), Android 5.1.1, latest Chrome with Web Bluetooth enabled.

@JanDW do you think about something like this?

Good customer ! ;-)

Small change, big impact. Thanks ;-)

Would be cool to have http://www.lairdtech.com/products/rm1xx-­lora-modules running Espruino as a hub for those Puck.js which will soon be all around my house ;-).
There's a NRF51822 inside (32k RAM, 256k FLASH and 4MBit SPI FLASH).