Hand-made letters

A TM1637 display (CLK GPIO23, DIO GPIO24, 3.3 V) should read donE — lowercase d, o, n, then capital E. The library's text font has no lowercase letters, so build each digit yourself and send them with display.write([b0, b1, b2, b3]).

Each byte has one bit per segment: a (top) = 0x01, b (top right) = 0x02, c (bottom right) = 0x04, d (bottom) = 0x08, e (bottom left) = 0x10, f (top left) = 0x20, g (middle) = 0x40. For example 1 is b + c = 0x06.