通过 Bash 打开到 Arduino 的串行连接
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Opening serial connection to Arduino through Bash
提问by hcaw
I have set up my Arduino so when I send a "0" via the serial monitor, a stepper motor turns a given amount.
我已经设置了我的 Arduino，所以当我通过串行监视器发送“0”时，步进电机会转动给定的量。
I want to include this in a bash script, but I can only get this to work when the arduino serial monitor is open and entering echo 0 > /dev/tty.usbserial641in bash. I assume this is because serial monitor is opening the connection for me.
我想将其包含在 bash 脚本中，但只有在 arduino 串行监视器打开并输入echo 0 > /dev/tty.usbserial641bash时才能使其工作。我认为这是因为串行监视器正在为我打开连接。
In my struggle to open the connection in bash (without serial monitor open) I have tried all manner of options with stty -f /dev/tty.usbserial641and have also tried connecting reset to ground with a 10uF capacitor.
在我努力在 bash 中打开连接（没有打开串行监视器）时，我尝试了各种选项，stty -f /dev/tty.usbserial641还尝试使用 10uF 电容器将复位连接到地。
Can any help me open the connection in bash without the use of arduino serial monitor?
有没有人可以帮助我在不使用 arduino 串行监视器的情况下在 bash 中打开连接？
System: Arduino Uno rev3 OS X 10.8.4
系统：Arduino Uno rev3 OS X 10.8.4
Many thanks, hcaw
非常感谢，hcaw
回答by John b
Do the commands below work for you.
执行以下命令对您有用。
# stty -F /dev/ttyUSB0 9600 cs8 -cstopb
# sleep 0.1
# echo "0" > /dev/ttyUSB0
There is a difference between the value 0 and the ascii char 0 (48). Which one you trying to send, and which one are you trying to receive?
值 0 和 ascii char 0 (48) 之间存在差异。您尝试发送哪一个，您尝试接收哪一个？
If you want to read the port from the terminal you can do it like this
如果你想从终端读取端口，你可以这样做
head -n 1 /dev/ttyUSB0 //the number after n is how many lines you want to read
As a last note, I am a fan of pySerial. I would much rather write an interface in python than shell scripts.
最后一点，我是pySerial的粉丝。我更愿意用 python 编写一个接口而不是 shell 脚本。
