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tags: Jetson Nano, Basic, NVIDIA, 基礎, 教學, 環境安裝, 設定, Mac, 勇哥, Yungger
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# Jetson Nano - 硬體安裝 (B01版)


[TOC]

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[微雪外殼套組](https://www.waveshare.com/wiki/Jetson_Nano_Case_%28C%29)
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基本外殼組, 不含調速風扇, WiFi 網卡與天線, 及攝影鏡頭

WiFi網卡
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電源開關與 SD 卡轉接頭
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[冷卻風扇](https://www.waveshare.com/wiki/Fan-4020-PWM-5V)（須注意上下的方向）
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:::info
設定風扇的轉速 (0~255, 0:停止, 255:全速, 值越大越快)
$ sudo sh -c 'echo 180 > /sys/devices/pwm-fan/target_pwm'
設定一開機即自動啟動冷卻風扇
$ sudo nano /etc/rc.local
在文檔最後加上以下設定, 且假設我們需要的風速是 150

#!/bin/bash
sleep 10
sudo /usr/bin/jetson_clocks
sudo sh -c 'echo 180 > /sys/devices/pwm-fan/target_pwm'

存檔後離開, 再修改檔案權限, 重啟
$ sudo chmod u+x /etc/rc.local
$ sudo reboot
:::

GPIO 轉接頭 (40 pins)
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鏡頭
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:::info
$ ls -ltrh /dev/video*
基本上會列出 /dev/video0，代表編號 0 為第一支攝影鏡頭
:::

組裝完成
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測試鏡頭
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- 確認系統是否能偵測到鏡頭 ?
$ ls -l /dev/video*

- 測試鏡頭顯示是否能正常 ?
$ gst-launch-1.0 nvarguscamerasrc sensor_mode=0 ! 'video/x-raw(memory:NVMM),width=3820, height=2464, framerate=21/1, format=NV12' ! nvvidconv flip-method=0 ! 'video/x-raw,width=960, height=616' ! nvvidconv ! nvegltransform ! nveglglessink -e

:::danger
若在 Jetson Nano 的 Python 程式碼使用 cap = cv2.VideoCapture(0) 一直無法獲得鏡頭的畫面, 出現錯誤
[ WARN:0] ... ap_gstreamer.cpp (480) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
:::

- 在 Python 程式中程式碼中, 將 cv2.VideoCapture(0) 改為 cv2.VideoCapture(gst_pipeline, cv2.CAP_GSTREAMER) 如下

gst_pipeline = ("nvarguscamerasrc ! "
                "video/x-raw(memory:NVMM), "
                "width=3820, height=2464, "
                "format=(string)NV12, framerate=21/1 ! "
                "nvvidconv flip-method=0 ! "
                "video/x-raw, width=1024, height=768, format=(string)BGRx ! "
                "videoconvert ! "
                "video/x-raw, format=(string)BGR ! appsink"
                )
                
cap = cv2.VideoCapture(gst_pipeline, cv2.CAP_GSTREAMER)