allow-hotplug wlan0
iface wlan0 inet static
address 192.168.1.1
netmask 255.255.255.240
## 14 usable addresses. (Well 13, as this is one of them)
# network 192.168.1.0
network 192.168.0.0
The network value is definitely wrong. The commented out value is the right one.
I don't know how the Raspberry Pi interprets these conflicting values but you might have a misconfigured network interface, so the Arduino probably cannot reach the Raspi.