At speed 100 it can process about 40 characters per second. Look in the code for instructions in the code to greatly boost the speed. (The code mentioned is under the backdrop code) I made this because I was bored. If it gets popular I'll add more characters. Right now I have space, and all letters usable. Anything that hasn't been defined yet will give back all 0's. The reason the code is so big is because I didn't just want to upload every character in Binary so I made it so that it does the actual math to figure it out. Note: There are some strange glitches with apostrophes and quotations where if the text is too long for some reason it just omits it. According to my knowledge, this is an issue with Scratch, but of course feel free to point out if I'm wrong.
ASCII charts, translating Binary tutorial.