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With the "testing" option in the WEB IDE you can print graphs over time. These can be recorded, too. The result are structured XML files. On youtube you find some videos about that (search for espruino and testing).

If you place the Pico correctly onto the breadboard, you don't need to do wires from Pico pin hole to breadboard (you should see the light green indicators around the breadboard holes). From breadboard to peripheral module it's "the art of routing" ;-)

Web bluetooth now in mainline Chrome.

Online now at Tindie.

For those without the soldering skills, see here.

Any chance to get a CR24xx mounted on the puck? (i.e. additional mounting holes/pads for a 24mm holder or a battery with solder pins). CR2450 is 620 mAh, CR2477 is 1000 mAh, see http://www.digikey.com/product-detail/en­/panasonic-bsg/CR-2477-HFN/P126-ND/10712­9 .

Module fs depends on module E (for SD card management). The physical SD card has to be connected by ie SPI.
I don't know what you are doing exactly, but there is the module File for streaming from and to files, too.
Perhaps http://www.espruino.com/File+IO#line=19,­25 helps.

... and there is (will be) a round one for the puck ;-) http://sharpmemorylcd.com/0-96-inch-memo­ry-lcd.html

Puck is an elf in William Shakespeare's "A Midsummer Night's Dream". Last seen in Dota 2 ;-)

... about final Puck.js design: In https://github.com/espruino/Espruino/blo­b/master/boards/PUCKJS.py it seems that you will use D4/D5 for the LED1/LED2 and two pins on the right pin header. Is that true? If so, why did you decide this way?

Is there a strict limitation to 3.0V or does the puck accept other batteries, ie 3.2V (LiFePo4) or 3.7V (LiPo)? And what is the maximum GPIO output power?

Click for more numbers ;-)

New opportunities with STM32L4xx and http://en.ai-thinker.com/html/2016/ESP_8­5_Series_0404/7.html ? It's ESP8266 with integrated flash.

Solderless pins, see https://www.sparkfun.com/products/retire­d/10527

https://www.youtube.com/watch?v=gFi_qdRK­6Og

or
http://www.espruino.com/EspruinoESP8266

@Gordon Hope your protos are going strong ;-) I have a proposal for the next revision. Why don't we "share" the ESP-12 footprint with the Hope RFM-9X LoRa module. I think this should function, see https://www.lucidchart.com/invitations/a­ccept/f7b4066c-9dcc-4cd7-bd92-c6db0fcf30­2b . As we need only RX/TX, CHPD to Vcc (and perhaps RST) on ESP-12, the rest of the pins should snugly fit for RFM-9X modules. So we could use the board either for short range or long range radio.
Feasable or not?

Edit: added picture.

Those selectable voltage power supplies are typically not suitable for
anything other than weighing down a tarp

FUNNY!

@pablorodiz You get everything from Gordon on Tindie, see https://www.tindie.com/search/#q=espruin­o . Delivery from GB to ES should be doable ;-)

@allObjects great explanation, eagerly awaiting your next post about modules and hardware initialisation.

http://www.espruino.com/MCP4xxx

My son upgraded from 8.1 to 10. No driver (re)install, everything is fine.

http://www.espruino.com/Reference#l__glo­bal_save

@ukflyer And now stick it on the bumper;-)

@Jorgen Did you use a separate power supply for the leds? If not you probably burnt something on the Pico. This would also explain the random colours from post #1.
@Gordon What burns normally first on Pico? Regulator? Capacitor?

There's a 128x160 variant with ILI9163, see http://www.aliexpress.com/item/5PCS-1-8-­inch-TFT-LCD-Screen-Module-with-PCB-ILI9­163-Drive-IC-128-160-SPI/32361332234.htm­l .
Even comes with an SD card slot. Could be the ideal Pico partner.

Edit: not pin compatible.