AkosLukacs

Most recent activity

• Best way to learn JavaScript?

  in JavaScript • 2 days, 20 hours

  

  In #34 Smartibot is mentioned https://hackspace.raspberrypi.org/issues­/34
  Their blimp demo video is pretty cool: https://thecraftyrobot.net/blogs/project­s/making-a-blimp-that-actually-flies And taking a look at their site again: The newer demos look fun too!

• Does the esp8266 have to be booted up from the web IDE to start it up

  in ESP8266 • 2 days, 22 hours

  

  Short answer: Yes, you can save code on it, and that will run at startup. Details at http://www.espruino.com/Saving

• Best way to learn JavaScript?

  in JavaScript • 3 days, 22 hours

  

  Hi, that's a though question, as I started a long time ago. But still find MDN docs as a great source / reference. The search is really useful, and there is a JS basics section on their site. As far as I have seen most new JS content focuses on a particular framework...

  Also for trying out any random snippet of JS code, you can use just any browser console on just any computer.
  And you can run Espruino interpreter in Linux, if you build it yourself, so you can experiment with code without an actual device

• uploading new js script doesn't kill current running script in RAM. - callbacks not called even if function completes

  in ESP32 • 1 week

  

  Wait a moment, IIRC ESP32/8266 connect to Wifi automatically, if wifi credentials were saved. And IIRC reset() will not disconnect from wifi, just resets Espruino interpreter. So yes, your wifi.on('connected' will not fire, because it's already connected to wifi by the time your code is executed.
  So what I did is check in my startup code if it's connected to wifi. If not, than start connecting. If already connected, just run wifi releated startup code immediately.

• uploading new js script doesn't kill current running script in RAM. - callbacks not called even if function completes

  in ESP32 • 1 week, 4 days

  

  reset(1) should erase all saved code and kill all running code as well. The only thing that stays the same should be wifi connection status.
  Can you create a minimal repro that shows this behaviour?

• Pixl.js - campervan

  in Projects • 1 week, 4 days

  

  Hi & welcome!

  1:
  Simplest would be a voltage divider. You need two resistors, just google it, should be pretty straight forward. But this only measures the voltage.

  If you want to measure current consumption as well, get an INA219, INA226 module from ebay / aliex.

  2: Yes, 3.3V max!

  3: Well, there are all kinds of starter kits, can't recommend one. Cheapest would probably be ebay / aliexpress. I guess also depends on where are you and what you want to do. Sensors? Actuators? LEDs? Analog stuff? Radio? Tons of options :)

• Workaround for not jet implemented String.padStart/padEnd

  in JavaScript • 1 week, 4 days

  

  Yepp, JS if full of interesting things, some help:
  https://developer.mozilla.org/en-US/docs­/Glossary/Truthy
  https://developer.mozilla.org/en-US/docs­/Glossary/Falsy

  Btw

  !! 0
  > false
  !! "0"
  > true
  

  Obligatory talk/video: https://www.destroyallsoftware.com/talks­/wat

• Workaround for not jet implemented String.padStart/padEnd

  in JavaScript • 1 week, 5 days

  

  Almost there, but this blows up of the len is smaller than the length of the string without padding. A small modification solves it ((len-sbl>0)):

  var len = 6;   
  var sb = parseInt(1023).toString(2);
  var sbl = sb.length;
  var sbFixedLenStart = ('0').repeat((len-sbl>0)?(len-sbl):0) + sb;
  var sbFixedLenEnd = sb + ('0').repeat((len-sbl>0)?(len-sbl):0);
  console.log(sbFixedLenStart);
  console.log(sbFixedLenEnd);
  

  MDN usually has polyfills or in this case, a link to polyfills: https://developer.mozilla.org/en-US/docs­/Web/JavaScript/Reference/Global_Objects­/String/padStart
  Altho might need some tweaks to better fit Espruino's constraints...

• Can someone just help me understand!

  in ESP8266 • 2 weeks, 3 days

  

  You can use a simple http post to send data to your backend. And from that point it's just like any data, you can do anything. Store it, send it to the client...
  Or you could use websockets maybe MQTT.

• Elevation change measurement with Pressure Sensor?

  in Puck.js, Pixl.js and MDBT42 • 1 month, 1 week

  

  Floating point should be no problem, unless there is some really crazy math. Even if you must use some crazy math, you can use Compilation that compiles your JS code to C and runs at C code speed.

  Haven't used, but the DPS310 has an impressive promo video.

  Or (I guess you already have a Puck, so suggesting another buy is not really nice) you could by a Ruuvitag that's pretty weather-proof. Altho' the onboard BME 280's datasheet says it's relative accuracy is +-0.12hPa, that's about 1 meter, that's not as good as you would want.

  allObjects could be right, not sure how much error would be due to the silicone cover's resistance in such small pressure changes...