update build script to set clock speed

build.sh

@@ -4,9 +4,12 @@ set -e
 function enable_i2c {
     if command -v raspi-config &> /dev/null; then
         echo "Enabling i2c"
-        sudo dtparam i2c_baudrate=400000
         sudo modprobe i2c-dev
         sudo raspi-config nonint do_i2c 0
+        if ! grep -q 'dtparam=i2c_arm=on$ /boot/config.txt'; then
+            echo "Setting the i2c clock speed to 400 kHz, you will have to reboot for this to take effect."
+            sudo sed -i -e 's/dtparam=i2c_arm=on$/dtparam=i2c_arm=on,i2c_arm_baudrate=400000/g' /boot/config.txt
+        fi
     else
 		echo "Can not automatically enable i2c you might have to do this manually"
 	fi