For the bigger fonts working from TrueType would be great, but IMO for the smaller ones if at all possible it's probably safer to use a bitmap font that's been designed to be rendered at 1bpp
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
That looks really cool - thanks for the link!
For the more recent fonts I added I'd been grabbing and converting specific bitmap fonts from https://github.com/Tecate/bitmap-fonts
For the bigger fonts working from TrueType would be great, but IMO for the smaller ones if at all possible it's probably safer to use a bitmap font that's been designed to be rendered at 1bpp