Kaermorhen

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• Beginner playing with HC-SR04 / General how to start question

  @Kaermorhen started

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  @DrAzzy replied
• Beginner playing with HC-SR04 / General how to start question

  in General • 9 years, 1 month

  

  Thanks a lot DrAzzy with

  setInterval(updateLed,100);
  

  added on i have what i want change of a led during movement of my hand, previously i messed up with brackets "{" after else.

  currenty i'm using DMIS in my work, but it isn't a lot of programming to do, due to the fact that there are a lot of ready to go functions to use in software (PC-DMIS) - I think i try learning Java on code.org for learn how to don't stuck by syntax.

  I'm impressed of how fast Espruino forum works.

• Beginner playing with HC-SR04 / General how to start question

  in General • 9 years, 1 month

  

  Hi,

  Finally I have bought some hardware to my espruino boards and I have a question:

  I started with code from distance sensing robot:

  var TRIG = A0; // ultrasonic trigger
  var ECHO = A1; // ultrasonic echo signal
  var MOTORS = [A3,A2,B10,B11]; // pins for the motors
  
  var t1 = 0;
  var dist = 0;
  var inManouver = false;
  
  // Get the distance from the sensor
  setWatch(function(e) { t1=e.time; }, ECHO, { repeat:true, edge:'rising'  });
  setWatch(function(e) { var dt=e.time-t1; dist = (dt*1000000)/57.0; },  ECHO, { repeat:true, edge:'falling' });
  // 20 times a second, trigger the distance sensor
  setInterval("digitalPulse(TRIG,1, 10/1000.0)",50);
  

  i'm trying to make for e.g.

  Led1 on if distance sensing between 10 and 20 cm
  Led2 on if 20 and 50 cm
  Led3 ......

  tried with switch (case) and multiplue ifs always fail, what is the best way to achive this functionality?

  I have also some general question about some book / tutorial on Java for total newbie before making some serious code.

  Thanks in advance for help.

  BR
  Max