Use different serial port

[Actpohomoc]

I have used already built-in serial connection for RFID reader. Is there way to use USB serial device to get information from CO2 sensor?
Or implement software serial like we have it on Arduino.

[UedaTakeyuki]

Hi Actpohomoc,

Thank you for your interesting and helpful suggestive question!
I.M.H.O. in the aspect of the software, the main difference in RPi UART and USB serial is just a tty device name (and some other parameters). What tty device do you see for the USB serial? Also, do you see the appropriate serial parameter?

In the wiring aspect, you should connect USB serial and MH-Z19 as follows:

USB Serial MH-Z19

• 5V --- Vcc
• GND --- GND
• TX --- RX
• RC --- TX

[TBR-BRD]

Hello, i have the same problem. ls -l /dev/serial/by-id => lrwxrwxrwx 1 root root 13 Jul 29 18:56 usb-FTDI_FT232R_USB_UART_A50285BI-if00-port0 -> ../../ttyUSB0
Which config must be edit to use this USB UART module to read the data?
It is really important!
Thank you

[UedaTakeyuki]

HI TBR-BRD,

How was the result of using /dev/ttyUSB0?

By the way, I recommend you the general way to find USB serial:

1. Without USB serial, look ls /dev
2. Connect USB serial, then look ls /dev again, find an added one must be the device file of USB serial.

Please tell me the result!

Sorry for my late reply due to my travel.

[UedaTakeyuki]

Hi TBR-BRD, Actpohomoc

I've added --serial_device option for specifying a specific serial device.
Please try it with the latest version of the library as follows:

sudo python -m mh_z19 --serial_device /dev/ttyUSB0

I'm appreciated your feedback!
Thanks, and sorry for my late reaction due to my summer vacation. Now, I've returned home.

[TBR-BRD]

Hi, thank you for your work. I will test it later this week. Thanks

…

Am 11.08.2019 um 08:53 schrieb Dr. Takeyuki Ueda ***@***.***>: Hi TBR-BRD, I've added --serial_device option for specifying a specific serial device. Please try it with the latest version of the library as follows: sudo python -m mh_z19 --serial_device /dev/ttyUSB0 Thanks, and sorry for my late reaction due to my summer vacation. Now, I've returned back home. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#12?email_source=notifications&email_token=ABV6FXHCE6BFNWFTWIR5YYTQD6ZPLA5CNFSM4IHI52I2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD4A3GZQ#issuecomment-520205158>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABV6FXBCOLW43TVDGKXES43QD6ZPLANCNFSM4IHI52IQ>.

[UedaTakeyuki]

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