No data on Serial Monitor programming ATTiny85 with Arduino Mega

Using Arduino Programming Questions
#1

Hello,

I’ve read all over the internet but I can’t find a solution to this problem.

I have Arduino IDE v1.0.5. r2, and a Arduino Mega 2560 as ISP to program an ATtiny85. I don’t have problems programing the ATtiny85, but I need to known the output data at Serial Monitor.

I use the library TinyDebugSerial for debuging:

#include <TinyDebugSerial.h>
TinyDebugSerial mySerial = TinyDebugSerial();
void setup() {
mySerial.begin( 9600 );
}
void loop() {
mySerial.print(“Sent :”);
mySerial.println(buffer);
}

But when I connect pin ‘PB3’ (real 2) of the ATtiny85 and the pin ‘TX0->’ of the Arduino Mega 2560, but i don’t have data. I try to put a 220ohm resistor between the pins without exit.

Any idea?

Thanks,

#2

Try this. but since you have a mega you don't need sofware serial. You can use one of your three extra serial ports in the mega.

#3

Hi Raschemmel,
The software serial is for the ATtiny85, not for the Arduino Mega 2560.

I tried to program my ATtiny85 with the example. I connected ‘PB4’ (tx) with ‘TX0->’ (tx to tx), but the serial communication with the Arduino IDE (using Mega 2560) doesn’t work… :(.

#include <SoftwareSerial.h>
SoftwareSerial mySerial(3,4); //rx, tx
void setup()
{
mySerial.begin(9600);
}
void loop()
{
mySerial.println(“hello world”);
delay(1000);
}

Thanks for your help i really appreciate it!!

#4

rataweb:
I tried to program my ATtiny85 with the example. I connected 'PB4' (tx) with 'TX0->' (tx to tx), but the serial communication with the Arduino IDE (using Mega 2560) doesn't work... :(.

I'm not surprised. You're connecting two outputs. You need to connect an output to an input...tx to rx (and rx to tx for 2-way comms).

#5

DOOOH !
Did you try the example at the link I posted ? That worked for me.

#6

Yes, but I don't know why it doesn't work!!!!

In the example, the owner put:

To use Software Serial you must have set the internal oscillator to 8MHz.

But I don't know how to do it...

Thanks,

#7

To have the tiny85 run at 8MHz change the low fuse byte from 0x62 to 0xe2.

#8

I didn't know how to do that so I got an 8Mz board file from another forum member and put that in my board file.

#9