Welcome and thank you for posting here in the Roku Community, @BeeKay!
We appreciate you reaching out for support. No worries! We're here to further assist you with this.
Indeed, if a projector has an HDMI port, you may attach a Roku player to it. We also need to ensure the compatibility of your projector to a Roku player. With this being said, may we know what specific Roku player and model is your projector?
We'll be looking forward to your response!
Best regards,
Carly
Carly Y.
Roku Community Moderator