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Topic: How to use ATMEGA 328 out of the Arduino Board for some Project ? (Read 1 time) previous topic - next topic

peterengland is Here

Hello I need help about how i can use Atmega 328 Chip out of the arduino uno board for some project ? also i have tried that Blinking LED example with Proteus ISIS but the rate of Blinking led is very slow and actual blinking rate is very high on arduino board why this is happens ? please tell me.
for example i am using LDR based Relay control using Arduino UNO, 10k Resistor, LDR  and Realy Board. it is working perfectly with arduino but not in Proteus simulation i am using following code.

Code: [Select]
void setup() {
//pinMode(4, OUTPUT);
pinMode(12, OUTPUT);
//Serial.begin(9600);
}

void loop(){
//digitalWrite(4, HIGH);
if(analogRead(0) < 590){
digitalWrite(12, LOW);
delay (10000);
} else{
digitalWrite(12, HIGH);
delay (100);
//Serial.println(analogRead(0));
}
}


Please look into attached image for Circuit.
Peter.

CrossRoads

There are lots of examples of standalone designs posted.
All require that VCC and AVCC be connected to 5V, with 100nF caps to Gnd, that Aref have a 100nF cap to Gnd, that Reset have a 10K resistor to +5.
If using Uno as bootloader, that 16 MHz xtal and two 22pF caps be connected.

I don't see a lot of that addressed in your simulation.  Also no current limit resistor with your LED.
I don't know how your simulation addresses fuse settings either - internal 8 MHz oscillator? divide by 8 prescaler? these defaults on  a blank chip would make your program appear  to run 1/16th of the normal speed.

The code would only seem to hold the LED off almost all the time with that 10 second delay.
It is only turned on for 1/10th of a second, I imagine the Analog reading would have to change pretty quick for  it have any kind of flashing appearance as once on it stays on until the analog reading changes.

So, all things for you to think about.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

peterengland is Here

Thanks for reply .. I got your point. i am going to try you said.
Peter.

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