Add following commands to /etc/wpa_supplicant/wpa_supplicant.conf and reboot raspberry pi.

network={
 ssid="eduroam"
 key_mgmt=WPA-EAP
 auth_alg=OPEN
 eap=TTLS
 identity="mail_address@nevsehir.edu.tr"
 password="your_password"
 phase1="tls_disable_tlsv1_1=1 tls_disable_tlsv1_2=1"
 phase2="auth=PAP"
}