74hc959
- [[http://www.nxp.com/documents/data_sheet/74HC_HCT595.pdf|datasheet]]
- [[https://www.arduino.cc/en/Tutorial/ShiftOut|example code and schematics by Arduino]]
- [[https://www.youtube.com/watch?v=nXl4fb_LbcI|movie about reading buttons with the 74HC959]]
- https://www.youtube.com/watch?v=6fVbJbNPrEU
My example on 123d.circuits.io
https://123d.circuits.io/circuits/1166640-74hc595-shift-register-exercise (:74hc959-shift-register.png?direct&700|)
My second example on 123d.circuits.io (with 2x 74hc595)
(::74hc959-2x-shift-register.png?direct&700|)
Binary counter
int clockPin = 10; //SH_CP (SHift register Clock Pulse)
int latchPin = 11; //ST_CP (STorage Clock Pulse)
int dataPin = 12; //DS
int address = 0;
byte data = 0;
void setup() { pinMode(latchPin, OUTPUT); pinMode(clockPin, OUTPUT); pinMode(dataPin, OUTPUT); }
void loop() { digitalWrite(latchPin, LOW); //ground latchPin and hold low for as long as you are transmitting shiftOut(dataPin, clockPin, MSBFIRST, 0); //flags enzo shiftOut(dataPin, clockPin, MSBFIRST, address >> 8); //address HIGH shiftOut(dataPin, clockPin, MSBFIRST, address); //address LOW shiftOut(dataPin, clockPin, MSBFIRST, data); // data digitalWrite(latchPin, HIGH); delay(50);
data++; address++; }
# read from 74HC166 and write to 74HC959
<code c>
const byte CLOCK = 8; // CP on 74hc166 and SHCP on 74hc959
const byte SWITCH_SELECT = 9; // !PE on 74hc166
const byte SWITCH_DATA = 10; // Q7 on 74hc166
const byte LED_SELECT = 11; // STCP on 74hc959
const byte LED_DATA = 12; // DS on 74hc959
void setup() {
pinMode(CLOCK, OUTPUT);
pinMode(SWITCH_SELECT, OUTPUT);
pinMode(SWITCH_DATA, INPUT);
pinMode(LED_SELECT, OUTPUT);
pinMode(LED_DATA, OUTPUT);
}
void loop() {
//read switches
digitalWrite(SWITCH_SELECT, LOW);
digitalWrite(CLOCK, HIGH);
digitalWrite(SWITCH_SELECT, HIGH);
byte al = shiftIn(SWITCH_DATA, CLOCK, MSBFIRST);
byte ah = shiftIn(SWITCH_DATA, CLOCK, MSBFIRST);
//write leds
digitalWrite(LED_SELECT, LOW);
shiftOut(LED_DATA, CLOCK, MSBFIRST, 0); //flags
shiftOut(LED_DATA, CLOCK, MSBFIRST, ah); //address high
shiftOut(LED_DATA, CLOCK, MSBFIRST, al); //address low
shiftOut(LED_DATA, CLOCK, MSBFIRST, 0); //data
digitalWrite(LED_SELECT, HIGH);
}