1.- Enconde your message in Base 64, you can use any online service, for example this one: http://www.utilities-online.info/base64/
Example:
message: Hi Hacker News!
encoded: SGkgSGFja2VyIE5ld3Mh
2.- Substitute
https://randator.com/#/brandGenerator?id=
Example:
https://randator.com/#/brandGenerator?id=SGkgSGFja2VyIE5ld3Mh
3.- Share the previous URL with anyone you want, the robot will say the message when it reaches the middle of the screen, keep the message short for proper visualization, enjoy! 🙂