Atmega 8 on breadbord, fuses

Other Hardware 3rd Party Boards
1

Hello!
I have lcd 16x2 and humidity(temp) sensor. Works fine on arduino uno

On Atmega8 (burn with avr910, hex from IDE) works only lcd ! On screen i see messages like: "Bus Hung", "ACK timeout".
Connection is right, im sure. Viewing forum i see message that it can be the fuses. But whats wrong with them?

Pls help

#include <LiquidCrystal.h>
#include "DHT22.h"

// Data wire is plugged into port 7 on the Arduino
// Connect a 4.7K resistor between VCC and the data pin (strong pullup)
#define DHT22_PIN 7

// Setup a DHT22 instance
DHT22 myDHT22(DHT22_PIN);


// initialize the library with the numbers of the interface pins

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);



void setup() {
  
  //Serial.begin(9600);
  //lcd.print("DHT22 Library Demo");

  // set up the LCD's number of columns and rows: 

  lcd.begin(16, 2);

  // Print a message to the LCD.

  //lcd.print("hello, world!");   

}



void loop() {

  // set the cursor to column 0, line 1

  // (note: line 1 is the second row, since counting begins with 0):

 

  // print the number of seconds since reset:

  //lcd.print(millis()/1000);
  
    DHT22_ERROR_t errorCode;

  delay(2000);
  //lcd.print("Requesting data...");
  errorCode = myDHT22.readData();
  switch(errorCode)

{
 case DHT_ERROR_NONE:
       lcd.setCursor(0, 0);
      lcd.print("Temperature ");
      lcd.print(myDHT22.getTemperatureC());
       lcd.setCursor(0, 1);
      lcd.print("Humidity ");
      lcd.print(myDHT22.getHumidity());
      lcd.print("%");
      break;
    case DHT_ERROR_CHECKSUM:
      lcd.print("check sum error ");
      lcd.print(myDHT22.getTemperatureC());
      lcd.print("C ");
      lcd.print(myDHT22.getHumidity());
      lcd.print("%");
      break;
    case DHT_BUS_HUNG:
      lcd.print("BUS Hung ");
      break;
    case DHT_ERROR_NOT_PRESENT:
      lcd.print("Not Present ");
      break;
    case DHT_ERROR_ACK_TOO_LONG:
      lcd.print("ACK time out ");
      break;
    case DHT_ERROR_SYNC_TIMEOUT:
      lcd.print("Sync Timeout ");
      break;
    case DHT_ERROR_DATA_TIMEOUT:
      lcd.print("Data Timeout ");
      break;
    case DHT_ERROR_TOOQUICK:
      lcd.print("Polled to quick ");
      break;
}

}

I burn with that parameters : boards.txt

atmega8.name=Arduino NG or older w/ ATmega8

atmega8.upload.protocol=stk500
atmega8.upload.maximum_size=7168
atmega8.upload.speed=19200

atmega8.bootloader.low_fuses=0xdf
atmega8.bootloader.high_fuses=0xca
atmega8.bootloader.path=atmega8
atmega8.bootloader.file=ATmegaBOOT.hex
atmega8.bootloader.unlock_bits=0x3F
atmega8.bootloader.lock_bits=0x0F

atmega8.build.mcu=atmega8
atmega8.build.f_cpu=16000000L
atmega8.build.core=arduino

I don`t use any bootloader , maybe that problem?

2

shouldn't be a problem not using a bootloader , one problem could be if you compiled the code for 16mhz crystal and your using the 8mhz internal , also from the error its sounds like a connection problem recheck the circuit
hope it helps

3

If you didn't explicitly burn the fuses when you programmed the device, then the fuses will be set to default values. For the atmega328p this means 8MHz internal clock prescaled by 8 (i.e. 1MHz clock) and the brownout detector disabled. To see what the default values do on the atmega8 and what values you need, see http://www.engbedded.com/fusecalc/.