Wifi problem Kali Raspberry pi 2

Hi, I just install kali on a raspberry pi 2. After a few our of search, i still not find how to enable my wifi usb stick (Edimax EW-7811). The usb stick seems to be recognize and the driver is loaded.... Ethernet is working fine.
Here are some config code, don't hesitate to ask something more ...

Thank you !
Gilles

Code:

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root@kali:~# lsusb
Bus 001 Device 005: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser
Bus 001 Device 004: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]
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. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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Code:

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root@kali:~# lsmod
Module                  Size  Used by
cfg80211              417413  0
rfkill                16763  2 cfg80211
8192cu                528485  0
hid_logitech            6521  0
evdev                  10552  3
joydev                  9427  0
bcm2835_gpiomem        3023  0
bcm2835_rng            1824  0
uio_pdrv_genirq        2986  0
uio                    8228  1 uio_pdrv_genirq
ipv6                  343808  20

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Code:

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root@kali:~# uname -r
4.1.19-v7

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Code:

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nano /etc/network/interfaces

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp

auto lo
iface lo inet loopback

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