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Oqib yonuvchi LEDlar

ULASHISH

Oqimli LEDlarni yaratish uchun Chiqishli massivdan foydalanish

Ushbu bobda biz "oqadigan" effekt yaratish uchun bir nechta GPIO pinlaridan foydalanamiz ularni ketma-ket yoqish va o‘chirish.

Bizga nima kerak?

Buning uchun sizga kerak:

Eslatma: Sizga kerak bo‘lgan rezistor siz foydalanadigan LED turiga qarab biz foydalanadigan narsadan farq qilishi mumkin. Ko‘pgina kichik LEDlar faqat 200-500 ohm atrofida kichik qarshilikka muhtoj. Qaysi qiymatdan foydalanayotganingiz umuman muhim emas, lekin rezistorning qiymati qanchalik kichik bo‘lsa, LED shunchalik yorqinroq bo‘ladi. porlash.

Turli xil tavsiflar uchun yuqoridagi ro‘yxatdagi havolalarni bosing komponentlar.

Sxemani qurish

Endi bizning Breadboardimizda sxemani qurish vaqti keldi.

Agar siz elektronika uchun yangi bo‘lsangiz, quvvatni o‘chirishni tavsiya qilamiz Raspberry Pi. Bunga yo‘l qo‘ymaslik uchun antistatik mat yoki topraklama tasmasini ishlating unga zarar yetkazish.

Raspberry Pi-ni buyruq bilan to‘g‘ri o‘chiring:

pi@w3demopi:~ $ sudo shutdown -h now

Raspberry Pi’dagi LED’lar miltillashdan to‘xtagach, Raspberry Pi’dan quvvat vilkasini sug‘urib oling (yoki u ulangan uzatkichni o‘chiring).

To‘g‘ri o‘chirmasdan vilkadan tortib olish xotira kartasining buzilishiga olib kelishi mumkin.

Raspberry Pi 3 with Breadboard. Flowing LEDs circuit

Yuqoridagi sxema rasmiga qarang.

  1. Raspberry Pi’da jumper simining ona (female) uchini GND piniga ulang. Misolimizda biz 6-fizik pindan foydalandik (GND, 3-qator, o‘ng ustun)
  2. Breadboardda ulangan o‘tish simining erkak oyog‘ini ulang GND quvvati, o‘ng tarafdagi Yer avtobusiga. Butun ustun non taxtasi ulangan, shuning uchun qaysi qator muhim emas. Bizning misolimizda biz uni 1-qatorga biriktirdik
  3. For each LED: Connect the LED so that it connects to 2 Tie-Point rows. In our example we connected:
    1. LED1-dan 5-qator (katod) va 6-qator (anod) ustuni J
    2. LED2 dan 8-qator (katod) va 9-qator (anod) ustuni J
    3. LED3 dan 11-qator (katod) va 12-qator (anod) J ustuniga
    4. LED4 dan 14-qator (katod) va 15-qator (anod) ustuni J
    5. LED5 dan 17-qatorga (katod) va 18 (anod) ustuni J
    6. LED6 dan 20-qator (katod) va 21 (anod) ustuniga J
    7. LED7-dan 23-qator (katod) va 24-qator (anod) ustuni J
    8. LED8-dan 26-qator (katod) va 27-qator (anod) ustuni J
  4. For each LED: Connect one of the legs of a 220 ohm resistor from the the Ground Bus column on the right side, and the other leg to the right side Tie-Point row where it connects to the cathode leg of the LED. In our example we connected:
    1. LED1 dan 5-qatorga I ustun
    2. LED2 dan 8-qatorga I ustun
    3. LED3 dan 11-qatorga I ustun
    4. LED4 dan 14-qatorga I ustun
    5. LED5 dan 17-qatorga I ustun
    6. LED6 dan 20-qatorga I ustun
    7. LED7 dan 23-qatorga I ustun
    8. LED8 dan 26-qatorga I ustun
  5. For each LED: Connect the female leg of a jumper wire to a GPIO pin on the Raspberry Pi, and the male leg of the jumper wire to the right side Tie-Point row where it connects to the anode leg of the LED. In our example we connected:
    1. LED1: 7-fizik pindan (GPIO 4, 4-qator, chap ustun) Tie-point 6-qator F ustunga
    2. LED2: 11-fizik pindan (GPIO 17, 6-qator, chap ustun) Tie-point 9-qator F ustunga
    3. LED3: 13-fizik pindan (GPIO 27, 7-qator, chap ustun) Tie-point 12-qator F ustunga
    4. LED4: 15-fizik pindan (GPIO 22, 8-qator, chap ustun) Tie-point 15-qator F ustunga
    5. LED5: 12-fizik pindan (GPIO 18, 6-qator, o‘ng ustun) Tie-point 18-qator F ustunga
    6. LED6: 16-fizik pindan (GPIO 23, 8-qator, o‘ng ustun) Tie-point 21-qator F ustunga
    7. LED7: 18-fizik pindan (GPIO 24, 9-qator, o‘ng ustun) Tie-point 24-qator F ustunga
    8. LED8: 22-fizik pindan (GPIO 25, 11-qator, o‘ng ustun) Tie-point 27-qator F ustunga

Sizning sxemangiz endi tugallangan bo‘lishi kerak va ulanishlaringiz ko‘rinishi kerak yuqoridagi rasmga juda o‘xshash.

Endi Raspberry Pi-ni ishga tushirish va Node.js skriptini yozish vaqti keldi u bilan o‘zaro aloqada bo‘ling.

Raspberry Pi va Node.js Flowing LEDs skripti

"Nodetest" katalogiga o‘ting va "flowingleds.js" nomli yangi fayl yarating:

pi@w3demopi:~ $ nano flowingleds.js

Fayl endi ochiq va uni o‘rnatilgan Nano muharriri bilan tahrirlash mumkin.

Quyidagilarni yozing yoki joylashtiring:

flowingleds.js

let Gpio = require('onoff').Gpio; //include onoff to interact with the GPIO
let LED04 = new Gpio(4, 'out'), //use declare variables for all the GPIO output pins
  LED17 = new Gpio(17, 'out'),
  LED27 = new Gpio(27, 'out'),
  LED22 = new Gpio(22, 'out'),
  LED18 = new Gpio(18, 'out'),
  LED23 = new Gpio(23, 'out'),
  LED24 = new Gpio(24, 'out'),
  LED25 = new Gpio(25, 'out');

//Put all the LED variables in an array
let leds = [LED04, LED17, LED27, LED22, LED18, LED23, LED24, LED25];
let indexCount = 0; //a counter
dir = "up"; //variable for flowing direction

let flowInterval = setInterval(flowingLeds, 100); //run the flowingLeds function every 100ms

function flowingLeds() { //function for flowing Leds
  leds.forEach(function(currentValue) { //for each item in array
    currentValue.writeSync(0); //turn off LED
  });
  if (indexCount == 0) dir = "up"; //set flow direction to "up" if the count reaches zero
  if (indexCount >= leds.length) dir = "down"; //set flow direction to "down" if the count reaches 7
  if (dir == "down") indexCount--; //count downwards if direction is down
  leds[indexCount].writeSync(1); //turn on LED that where array index matches count
  if (dir == "up") indexCount++ //count upwards if direction is up
};

function unexportOnClose() { //function to run when exiting program
  clearInterval(flowInterval); //stop flow interwal
  leds.forEach(function(currentValue) { //for each LED
    currentValue.writeSync(0); //turn off LED
    currentValue.unexport(); //unexport GPIO
  });
};

process.on('SIGINT', unexportOnClose); //function to run when user closes using ctrl+cc

Kodni saqlash uchun "Ctrl+x" tugmasini bosing. "y" bilan tasdiqlang va ismni "Enter" bilan tasdiqlang.

Kodni ishga tushiring:

pi@w3demopi:~ $ node flowingleds.js

Endi LEDlar ketma-ket yoqilishi va o‘chirilishi, stream effektini yaratishi kerak.

Dasturni Ctrl+c bilan yakunlang.

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