bar led + shift register + nodeMCU

[sayanee]

Related to #2

• Reference
  • Arduino ShiftOut on nodeMCU
• Wiring for 74HC595
  1. DS pin 14 to Digital pin D7 on nodeMCU (data pin)
  2. SH_CP pin 11 to Digital pin D5 on nodeMCU (clock pin)
  3. ST_CP pin 12 to Digital pin D8 on nodeMCU (latch pin)
  4. GND pin 8 to GND
  5. Vcc pin 16 to 5V
  6. OE pin 13 to GND
  7. MR pin 10to 5V
  8. pin 1 to 1kΩ resistor and GND
  9. pin 2 to 1kΩ resistor and GND
  10. pin 3 to 1kΩ resistor and GND
  11. pin 4 to 1kΩ resistor and GND
  12. pin 5 to 1kΩ resistor and GND
  13. pin 6 to 1kΩ resistor and GND
  14. pin 7 to 1kΩ resistor and GND
  15. pin 15 to 1kΩ resistor and GND
• Code

int latchPin = 15; // pin D8 on NodeMCU boards
int clockPin = 14; // pin D5 on NodeMCU boards
int dataPin = 13; // pin D7 on NodeMCU boards

void setup() {
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
}

void loop() {
  shiftOut(dataPin, clockPin, MSBFIRST, 1); // Try LSBFIRST and digits from 1 to 2^8 (8 leds)
  digitalWrite(latchPin, HIGH);
}