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I am afraid MCP1703 will find it difficult to power both Espruino and ESP8266.
In the datasheet, 250mA is given as maximum current.

@tage that's Li-Ion batteries. They are very demanding on what voltage is applied to them, and may take fire when overvoltage is applied.
Nominal voltage is 3,7V but during charging the voltage increase up to 4,2V (which is a limit that shall never be exceeded).
This charger can't be used as is, as batteries are charged by the 3.3V of Espruino's I/O. And with the available current on an I/O it will take loooong to charge a 2100mAh battery.

beyond 15mm maybe you'll not have enough collector current. So you won't see any switching at the output.

If you want to dim the EL wire you shall change the frequency of the inverter

It is possible but EL wire work with 100V at a few hundreds hertz. So need to add some interface circuit to drive EL wire with the Espruino.
The how many answer depends on the possibilities of the interface circuit. I have seen an EL shield at seeedstudio for Arduino which was able to drive four EL wires. Each of them could be powered on/off.
They also have another one that maybe more interesting working both on 3V and 5V but driving only one EL wire

An ESP8266 alone is all you need to manage a temperature sensor. The ESP12 flavor is much better to connect peripherals. This board is less than 5$.
It can manage a one wire, I²C or SPI temperature sensor and send the information to a base station. You can even add a small OLED screen if you want to display the temperature locally.
You only need the pico at the base station.

It is not an issue, it is a feature.
Look here : http://forum.espruino.com/conversations/275631/

Did you try an installation from the files on github?

Manually installed from github and got an error caused by "Thumbs.db" files lying around in some img directories. Once the files are deleted WedIDE is running fine.

Gave a try and had the same problem on a PC where it was previously installed.

@errantspark, every factory dreams of customers like you that buy boards by batch of 100 and serial fry them ;-)

I just gave a try and found it simple and efficient. Thank you @Gordon

Thanks it will help

If you put power LED and/or esp8266 in the kit, I will suggest adding a 5V/2A power block has those can be problematic on a standard USB port.

Well that's what WS2812 are expecting. See page 5 of datasheet

POV system monitor that's great.

C5,C6,L1 is a bandpass filter. But the capacitors are way too high in my opinion.

Timing accuracy is one part of the problem. You shall consider power consumption too. I'm sure using the 32kHz oscillator will by much more efficient than using the 8MHz one in deep sleep mode.

Thanks!

note that I have made a small correction to the code in order to prevent double launch of the blink sequence if it is already active.

Delay is not a good way to manage time dependant tasks as it uses all the resources for itself
You can do it this way:

var maxTime = 500;
var maxStep = 10;
var count = 0;
var timer;
var state = false;
var blinkActive = false;

function blink(){
  state = !state;
  digitalWrite(LED1,state);
  if (!state) count--;
  if (count===0){
    clearInterval(timer);
    blinkActive = false;
  }
}

function launchBlink(){
  if(blinkActive === false){
    count = maxStep;
    timer = setInterval(blink,maxTime);
    blinkActive = true;
  }
}

function onInit(){
  clearInterval();
  LED1.write(0);
  setWatch(launchBlink,BTN,{repeat: true, edge: 'rising', debounce: 100});
}

onInit();

My pico is updated to V80 and I have no problem with your code even if I let it powered off for more than 10 seconds. No flicker.
Are sure this is not an issue with your USB dock?

Maybe you can put your code in order for us to reproduce the problem.

I must apologize.
I have retried and found that the problem is coming from a stupid breadboard (and its stupid user).
It is a bit old and some contacts are "sporadic". Trashed and replaced by a new one and all is working as expected.

Thanks to look at it.
Not really a problem. I have currently switched the SCE pin to another one. I was trying to use B14 in order to have more free pins for other purpose.

Maybe it should but in fact not.
Just connecting a Nokia5110 to the Pico.
SCK to pin B13
MOSI to B15
D/C to B10
RST to B1
SCE to B14 or A8
GND to GND
VCC to 3.3V

This code gives a blank screen

B14.write(1); //CS_LCD

var g;

var MONTHS = [
  "Jan","Feb","Mar","Apr","May","Jun",
  "Jul","Aug","Sep","Oct","Nov","Dec"
  ];

function draw() {
  g.clear();
  var t = new Date();
  var date = t.getDate()+" "+MONTHS[t.getMonth()]+" "+t.getFullYear();
  var time = t.getHours()+":" + 
       ("0"+t.getMinutes()).substr(-2);
  var secs = ("0"+t.getSeconds()).substr(-2);
  // top left date
  g.setFontBitmap();
  g.drawString(date,0,0);
  // middle time
  g.setFontVector(20);
  var timeWidth = g.stringWidth(time);
  g.drawString(time,(g.getWidth()-timeWidth-12)/2,10);
  // seconds over to the right
  g.setFontBitmap();
  g.drawString(secs,(g.getWidth()+timeWidth-8)/2,26);
  // send to LCD
  g.flip();
}

function onInit() {
  clearInterval();
  // Setup SPI
  //var spi = new SPI();
  SPI2.setup({ sck:B13, mosi:B15});
  // Initialise the LCD
  // connect(/*=SPI*/_spi, /*=PIN*/_dc, /*=PIN*/_ce, /*=PIN*/_rst, callback)
  g = require("PCD8544").connect(SPI2,B10,B14,B1, function() {
    // When it's initialised, set up an animation at 1fps (1s per frame)
    setInterval(draw, 1000);
  });
}

onInit();

and this one works as expected

A8.write(1); //CS_LCD

var g;

var MONTHS = [
  "Jan","Feb","Mar","Apr","May","Jun",
  "Jul","Aug","Sep","Oct","Nov","Dec"
  ];

function draw() {
  g.clear();
  var t = new Date();
  var date = t.getDate()+" "+MONTHS[t.getMonth()]+" "+t.getFullYear();
  var time = t.getHours()+":" + 
       ("0"+t.getMinutes()).substr(-2);
  var secs = ("0"+t.getSeconds()).substr(-2);
  // top left date
  g.setFontBitmap();
  g.drawString(date,0,0);
  // middle time
  g.setFontVector(20);
  var timeWidth = g.stringWidth(time);
  g.drawString(time,(g.getWidth()-timeWidth-12)/2,10);
  // seconds over to the right
  g.setFontBitmap();
  g.drawString(secs,(g.getWidth()+timeWidth-8)/2,26);
  // send to LCD
  g.flip();
}

function onInit() {
  clearInterval();
  // Setup SPI
  //var spi = new SPI();
  SPI2.setup({ sck:B13, mosi:B15});
  // Initialise the LCD
  // connect(/*=SPI*/_spi, /*=PIN*/_dc, /*=PIN*/_ce, /*=PIN*/_rst, callback)
  g = require("PCD8544").connect(SPI2,B10,A8,B1, function() {
    // When it's initialised, set up an animation at 1fps (1s per frame)
    setInterval(draw, 1000);
  });
}

onInit();

I have updated my Pico to 1V80