Google Slides and CANVAS/Google Classroom
First of all: Download the free google drive and google slides app to your smart phone or ipad. If you have this you can have access to all your google drive and even edit on your phone (easy to take photos. Google Drive works really well on iphone.
4th Step: Click the + sign at the top and click "image", select the "from Camera" and take a photo of your board.
and you are done...Almost.
5th Step: Post the link to your slide presentation somewhere you students can easily view it. Some ideas where to post the link:
1. Top of CANVAS modules (link)
2. Google Classroom Link
3. Email link
4. Use TinyURL to make it shorter and have students write in agenda or notebook.
5. Share presentation with students.
*If students have this link to the presentation you can add photos (of the board or even add exemplar student work too!), change info, give announcements, etc. Google slides allows for so many possibilities.