Connecting to a DHTxx Sensor

https://learn.adafruit.com/dht/connecting-to-a-dhtxx-sensor

https://unix.stackexchange.com/questions/12359/how-can-i-monitor-serial-port-traffic




***************************************************************************
Arduino: 1.8.12 (Linux), Board: "Arduino Uno"

An error occurred while uploading the sketch
avrdude: ser_open(): can't open device "/dev/ttyUSB0": Permission denied


Solved error with

$ ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 feb 14 22:41 /dev/ttyUSB0

$ sudo usermod -a -G dialout p
$ sudo chmod a+rw /dev/ttyUSB0
***************************************************************************

Show data on Serial Monitor (Arduino IDE - Tools > Serial Monitor)



Serial transfer rate is defined in Sketch by

Serial.begin(9600);    

with Arduino/Genuino UNO - Serial.begin(115200);

https://www.programmingelectronics.com/using-the-print-function-with-arduino-part-1/



Show data on Terminal

$ sudo screen -L /dev/ttyUSB0 9600

-L Tell screen to turn on automatic output logging. Default logfile name is "screenlog.0"


https://www.gnu.org/software/screen/manual/html_node/index.html#SEC_Contents



Show tty devices

https://www.cyberciti.biz/faq/find-out-linux-serial-ports-with-setserial/

$ dmesg | grep tty

[    0.076052] printk: console [tty0] enabled                                                Monitor
[    0.877870] 00:02: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A           Serial port
[    3.411073] usb 1-6: ch341-uart converter now attached to ttyUSB0                         USB ports


$ sudo apt install setserial

/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4                                               Serial port
/dev/ttyS1, UART: unknown, Port: 0x02f8, IRQ: 3
/dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4
/dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3