Sjoerd,
Welcome to HouseBot
If you are able to turn the lamp on and off using the
Power State Property in HouseBot, then you've got the CM11, HouseBot Device, and X10 switch all configured correctly.
Depending on the type of X10 switch you are using, you can use different types of dimming. Your HouseBot X10 Device should have two "direct dimming" properties that can be used for some switches. If you don't have these Properties in the Device, make sure you create an X10 Lamp Module Device, and not an X10 Appliance Module. If you have a Leviton brand switch, you can set the
Leviton Dim Level Property to dim the lamp. If you have a switch that supports preset dim commands (not many do), you can use the
X10 Preset Dim Level Property.
If you have a basic X10 lamp module that doesn't support either forms of direct dimming, you will need to send standard X10
Dim or
Bright commands to change the light intensity. This works well for some things, but you may find it limiting for most applications. To reduce the light level, set the
Direct X10 Command Property to
Dim;n where n = the number of steps to dim. To increase the light level, set the Property to
Bright;n. You may find more information in the online help for the Device.
Once you get this working, you can create Property Change buttons (or even Task buttons) on your Theme to control the lamp using a Software Remote.