hi guys, i new to arduino, so far i can program 8 leds with a 74hc595 chip to make them blink one by one at a time.
but now i want it to control 16 leds and have the same effect. do i have to create 2 binary high and low? something like that?
The wiring is done , it is almost same as this :http://bildr.org/2011/02/74hc595/
here my current code for 8 leds:
int clockPin = 12; //IC Pin 11, Yellow Jumper
int dataPin = 11; //IC Pin 14, Blue Jumper
int latchPin = 8; //IC Pin 12, Green Jumper
const int buttonPin = 2;
int buttonState = 0;
int potPin = A0; // select the input pin for the potentiometer
int val = 0; // variable to store the value coming from the sensor
byte patterns[9] = {
B00000000,
B10000000,
B01000000,
B00100000,
B00010000,
B00001000,
B00000100,
B00000010,
B00000001
};
int index = 0;
int count = 8;
void setup() {
pinMode(buttonPin, INPUT);
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
Serial.begin(9600);
}
void loop() {
buttonState = digitalRead(buttonPin);
val = analogRead(potPin);
Serial.println(val);
if (buttonState == HIGH){
for (int i=1;i<10;i++){
digitalWrite(latchPin, LOW);
shiftOut(dataPin, clockPin, LSBFIRST, patterns[i]);
digitalWrite(latchPin, HIGH);
delay(val);
}
}else {
digitalWrite(latchPin, LOW);
shiftOut(dataPin, clockPin, LSBFIRST,0);
digitalWrite(latchPin, HIGH);
}
}
okay i just solve that problem, another question is that how much shift register can attiny85 can handle?
how much shift register can Attiny85 can handle?
i am planning to power up 60 Leds from Attiny 85 is that possible? they are 12 v leds, and i am using 74hc595 pair with uln2003A for each 7 or 8 leds.
please help me out
fungus
March 6, 2014, 7:59pm
6
george221:
It depends a lot on how they're arranged and the ingenuity of the person who writes the software.
george221:
Sure. With only 60 LEDs you can use a whole byte to store the LED state, no problem.
Go simpler tho - TPIC6B595, like a HC595 and ULN2803 combined into one package.
tpic6b595.pdf (427 KB)
Here's arduino functionality combined with TPIC6B595s to drive up to 96 LEDs, or 96 LED strings.http://www.crossroadsfencing.com/BobuinoRev17/
Thanks guys, it helps alot
it there any other finish product for this kind of application?
Maybe. ATtiny85 doesn't have that much memory for doing stuff. I used an Atmega1284P with 16K SRAM for my large shift register design.
I design cards for folks all the time. You need something custom? I can do that.
6 IO pins, and
k i will try it out first if it doesn't go well, i will just buy it
