Connecting a PI with two Arduino's - Raspberry Pi Forums

hi, i'm trying connect pi 2 arduino's (using usb cables) , communicate using java , rxtx library.

java program works , can find 1 of 2 arduino's. i'm having issues second arduino'.

first tried figure out ports of arduino's. found out /dev/ttyusb0 works 1 of arduino's. there doesn't seem /dev/ttyusb1 or other port other arduino. tried /dev/ttyacm0 doesn't work.

here output dmesg after plugging in non working arduino:

[ 795.793920] usb 1-1.4: usb disconnect, device number 6
[ 802.688258] usb 1-1.5: new full-speed usb device number 7 using dwc_otg
[ 802.802140] usb 1-1.5: new usb device found, idvendor=2341, idproduct=0043
[ 802.802159] usb 1-1.5: new usb device strings: mfr=1, product=2, serialnumber=220
[ 802.802173] usb 1-1.5: manufacturer: arduino (www.arduino.cc)
[ 802.802185] usb 1-1.5: serialnumber: 95335343036351a001b0
[ 802.803473] cdc_acm 1-1.5:1.0: ttyacm0: usb acm device

here output of lsusb:

bus 001 device 007: id 2341:0043 arduino sa uno r3 (cdc acm)
bus 001 device 005: id 1a86:7523 qinheng electronics hl-340 usb-serial adapter
bus 001 device 004: id 8888:6666
bus 001 device 003: id 0424:ec00 standard microsystems corp. smsc9512/9514 fast ethernet adapter
bus 001 device 002: id 0424:9514 standard microsystems corp.
bus 001 device 001: id 1d6b:0002 linux foundation 2.0 root hub

same setup works fine on regular laptop btw. know both arduino's fine.

clues?

thanks

the serial port (two pins on gpio) should work second connection - post has info (around nanpy , arduino , serial ports) (but careful of voltage differences)
viewtopic.php?f=44&t=46881&p=839460&hilit=nanpy#p839460

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