Victor

Most recent activity

• Rasbery Pi 3 & Espruino Serial Communication

  in Electronics • 7 years, 9 months

  

  Thanks @Gordon we'll give it a try and let you know how it goes.

• Rasbery Pi 3 & Espruino Serial Communication

  @Victor started

  • 5 comments
  • 3,217 views

  @Victor replied
• Rasbery Pi 3 & Espruino Serial Communication

  in Electronics • 7 years, 9 months

  

  I've read that the hardware serial is used by bluetooth on the Pi, is this what you mean? As I've read that you can swap the bluetooth onto the software serial so you can use hardware instead.

  Cheers!

• Rasbery Pi 3 & Espruino Serial Communication

  in Electronics • 7 years, 9 months

  

  Hi,

  I'm wondering whether it's possible to connect one master Rasbery Pi 3 using the GPIO serial pins to many slave Espruino devices through only RX and TX. (only 2 pins)

  Looking at the pin diagrams for each the PI is labeled as UART while the Espruino is labeled with USART. Is this a problem?

  I've also been reading some articles talking about voltage differences, does anyone have any insight into whether this is possible and what we need to consider?

  http://spellfoundry.com/2016/05/29/configuring-gpio-serial-port-raspbian-jessie-including-pi-3/
  https://oscarliang.com/raspberry-pi-and-arduino-connected-serial-gpio/

  Thank,
  Victor

• Communicating with multiple Espruino devices

  @Victor started

  • 25 comments
  • 7,499 views

  @allObjects replied
• Communicating with multiple Espruino devices

  in General • 8 years, 2 months

  

  So we've found a few things but I'm not sure if they are any help.

  Master receive LED is flashing but barely. (Slave is sending but master not receiving)

  Does it matter that three different voltage regulators are being used with the three picos. May we need to connect them up afterward the regular in parallel?

  May we need more pull up resistors if there are more slaves?

• Communicating with multiple Espruino devices

  in General • 8 years, 2 months

  

  Sorry to keep bothering you. We connected LEDs and they seem to be flashing correctly. (Apart from slaves send back to master in which case slave send flashes but master receive does not)

  I've attached a couple of pictures of our designs and I was just wondering if you could have a quick look. I believe it may be something with the electronics as our testing results seem quite inconsistent.

  Thanks!

• Communicating with multiple Espruino devices

  in General • 8 years, 2 months

  

  Yes, they all have common GND and VCC, we have 3 Picos connected and B6 and B7 are wired as your instructions.

• Communicating with multiple Espruino devices

  in General • 8 years, 2 months

  

  We're using a M and F USB to connect the slave boards together. (I assume this shouldn't affect anything)

  We only have the master plugged into the PC. (Is this what the USB.setConsole is for?)

• Communicating with multiple Espruino devices

  in General • 8 years, 2 months

  

  We are currently using the below code with no success. The slaves are connected through a USB connector so do we need a 4.7k pull-up resistor on each slave or just once? (Currently we have one)

  //Master
  E.setBootCode("function cmdOnSlave(slave, cmd) {
       Serial1.println('if(ID==\"' + slave + '\")' + cmd + ';');
  }
  USB.setConsole(true); // make sure console stays off Serial1
  var line = '';
  Serial1.on('data', function(d) {
       line += d;
       i = line.indexOf('\n');
       while (i >= 0) {
            console.log(line.substr(0, i)); // do stuff with data
            line = line.substr(i + 1);
            i = line.indexOf('\n');
      }
  });
  ", true)
  
  //Slave
  E.setBootCode("
      var ID = getSerial();
      pinMode(B6, 'af_opendrain');
       echo(0);
  ", true);