条状 LED 灯墙 | Filament LED Wall

效果演示 | Demo

硬件 | Hardware

• Jetson Xavier NX
• Arduino Nano Development Board
• JXI5020 LED Driver
• 38mm 3V 2700K Filament LED

上位机代码 | Host Code (Python)

import cv2
import os
import serial
from serial.tools import list_ports
import time
import pyrealsense2 as rs
import numpy as np

class FilaWall:
    # Display Configuration
    screenWidth = 5
    screenHeight = 4
    pixelWidth = screenWidth * 4
    pixelHeight = screenHeight * 4
    pipeline = None
    ser = None
    fps = 30

    def init_realsense(self):
        self.pipeline = rs.pipeline()
        config = rs.config()
        config.enable_stream(rs.stream.depth, 640, 480, rs.format.z16, self.fps)
        self.pipeline.start(config)

    def start_running(self):
        while True:
            frames = self.pipeline.wait_for_frames()
            depth = np.asanyarray(frames.get_depth_frame().get_data())
            dimg_gray = cv2.convertScaleAbs(depth, alpha=255/4000)
            dimg_gray = cv2.flip(dimg_gray, 1)
            gray_part = dimg_gray[0:480, 10:610]
            gray_blur = cv2.blur(gray_part, (30, 30))
            gray_rescaled = cv2.resize(gray_blur, (self.pixelWidth, self.pixelHeight))
            ret, gray_thresh = cv2.threshold(gray_rescaled, 100, 255, cv2.THRESH_BINARY_INV)
            for unitRow in range(self.screenHeight):
                cols = range(self.screenWidth) if (unitRow % 2 == 0) else range(self.screenWidth - 1, -1, -1)
                for unitCol in cols:
                    self._displayUnit(unitRow, unitCol, gray_thresh)
            self._sendCmd(0x10)  # sync signal
            if cv2.waitKey(1) == ord('q'): break

下位机代码 | Arduino

#include <Arduino.h>
#define LED_OE  9
#define LED_LE  6
#define LED_CLK 3
#define LED_SDI 5

void setup() {
  Serial.begin(115200);
  pinMode(LED_OE, OUTPUT); pinMode(LED_LE, OUTPUT);
  pinMode(LED_CLK, OUTPUT); pinMode(LED_SDI, OUTPUT);
  digitalWrite(LED_OE, 0);
}

inline void toggleClock() { digitalWrite(LED_CLK, 1); digitalWrite(LED_CLK, 0); }
inline void toggleLatch() { digitalWrite(LED_LE, 1); digitalWrite(LED_LE, 0); }

void loop() {
  while (Serial.available() > 0) readMsg(Serial.read());
}

void readMsg(char msg) {
  char cmd = msg >> 4, data = msg & 0x0F;
  if (cmd == 0x0) {
    for (int i = 0; i < 4; ++i) { digitalWrite(LED_SDI, data & (0x1 << i)); toggleClock(); }
  } else if (cmd == 0x1) {
    toggleLatch();
  }
}

参考资料 | Reference

乒乓显示器 / Ping-pong display: YouTube