Training dataset with happy and sad faces?

Are there any datasets for download which have faces tagged with emotion - eg happy/sad?
I have an idea for a demonstrator system using an Nvidia Jetson board. The camera takes a picture of your face. an ML framework then reports if you have a happy or sad expression.
An enhancement would be to get the program to play a short audio clip saying "You seem happy"or “You seem sad”.
Pointers towards a dataset thankfully received. Or it is a weekend of me pulling funny faces.

Rosalind Picard’s group at the MIT Media Lab has done a lot of work in this space, they might have some datasets available to play with.