diff --git a/README.md b/README.md
index 87043ca..b93818f 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,37 @@
 # roberto
 
-Robot
\ No newline at end of file
+Robot
+
+
+## Prepare
+sudo systemctl --full --force edit wifi_powersave@.service
+
+[Unit]
+Description=Set WiFi power save %i
+After=sys-subsystem-net-devices-wlan0.device
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/sbin/iw dev wlan0 set power_save %i
+
+[Install]
+WantedBy=sys-subsystem-net-devices-wlan0.device
+
+rpi ~$ sudo systemctl disable wifi_powersave@on.service
+rpi ~$ sudo systemctl enable wifi_powersave@off.service
+
+
+
+## Camera test
+
+raspivid -a 12 -t 0 -w 1280 -h 720 -vf -ih -fps 30 -l -o tcp://0.0.0.0:5000
+
+mplayer -x 1280 -y 720 -geometry 0:0 -fps 200 -demuxer h264es -noborder ffmpeg://tcp://172.16.85.221:5000
+
+
+sudo apt install gstreamer1.0-tools
+
+Sender (Pi): gst-launch-1.0 -e v4l2src do-timestamp=true ! video/x-h264,width=640,height=480,framerate=30/1 ! h264parse ! rtph264pay config-interval=1 ! gdppay ! udpsink host=192.168.178.20 port=5000
+
+Receiver: gst-launch-1.0 -v udpsrc port=5000 ! gdpdepay ! rtph264depay ! avdec_h264 ! fpsdisplaysink sync=false text-overlay=false