Digispark Attiny85 devboard USB port question

Using Arduino Project Guidance
1

Hello!

I just got myself a Attiny85 from digispark (the one with a normal usb male) and been trying to figure out the following:

What I want:
When I connect the attiny via the buildt in usb on the devboard to a computer, the buildin led (pin 1) should light up IF the attiny recieves data from the computer via the USB.

What I've tried:
My knowledgebase is limited but I viewed multiple libraries (DigiUSB, DigiCBC, SerialUSB) and tried different example codes with my own modifications. Without results.

I can upload and run simple code but Iam clueless in how I can make it stay connected to the PC.

I know that the above is not at all a good explanation but I don't know much about this stuff so if anything is unclear please just ask counter questions and I will do my best to clear it out.
image
Image is from: Useless Pin 5 in all Digispark ATtiny85 boards? [SOLVED] - #3 by pplg

2

Anyone? If my post is written in a bad way please tell me so I can fix it. Really need help with this one.

3

If I understand your question correctly and you want to use USB serial connection you will not be able to because it is not supported.

4

Hello and thank you for your reply!
Well, not necessarily serial. A usb have 4 physical wires (atleast in usb 2.0), 1 for 5v, 1 for GND, 1 for D+ and one for D-. I want to know if anything passes through D+ or D-, aka traffic is recieved from the source Ive plugged the USB into. And if it get's any data then I just want the built in LED on the board to light up.

5

Rubbish....... look here.
https://www.youtube.com/watch?v=MmDBvgrYGZs

6

Yes that works fine. :slight_smile: But unsure if my problem is even possible with this device :frowning:

7

It's not rubbish. Nowhere in the video from the link did I see work with the serial monitor.

https://digistump.com/wiki/digispark/tutorials/connecting - 'The Digispark supports all features found in the IDE with the exception of the serial monitor and the burn bootloader functionality.'

8

There is no hardware serial port, but you can use software serial.

http://digistump.com/board/index.php?topic=862.0

9

Wow... this could actually be it! I tried that library before but with 16.5 instead of 16 or 8 (as your link mentions). Will try to make that change and read from the USB pins once more!

10

EDIT to the below: Now it seems to work :smiley: Besides that the led wont turn off after (what i think) the data stream is cancelled)

Im new to this so Im unsure if my code is correct... Anyone care to take a look?
Right now the led (pin 1) lights up as if data is recieved (my goal)... but even if i plug it into a power outlet in the wall. So not working :frowning:

Running the Digispark on 8Mhz (based on my choice in arduino IDE)

#include <SoftwareSerial.h>

const byte rxPin = 3;
const byte txPin = 4;

// Set up a new SoftwareSerial object
SoftwareSerial mySerial (rxPin, txPin);

void setup() {                
  mySerial.begin(38400);
  pinMode(1, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
  if (mySerial.available() > 0) {
        digitalWrite(1, HIGH);
        delay(2000);
    }
  else {
    digitalWrite(1, LOW);
  }
}
11

if there is something available and you never read it to empty the buffer, it will always be available.

#include <SoftwareSerial.h>

const byte rxPin = 3;
const byte txPin = 4;

// Set up a new SoftwareSerial object
SoftwareSerial mySerial (rxPin, txPin);

void setup() {
  mySerial.begin(38400);
  pinMode(1, OUTPUT);

  while (mySerial.available() > 0) {
    mySerial.read();  // empty buffer
  }
}

// the loop routine runs over and over again forever:
void loop() {
  if (mySerial.available() > 0) {
    digitalWrite(1, HIGH);
    while (mySerial.available() > 0) {
      mySerial.read();  // empty buffer
    }
    delay(2000);
  }
  else {
    digitalWrite(1, LOW);
  }
}
12

For software serial as #8 suggested, also take a look at this video.......
https://www.youtube.com/watch?v=HJ4mhXv-MXo

13

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.