Espresso Shot Timer

No sensors. The board is the whole of it. A shot is twenty-five to thirty seconds, and what you want is a number you can read from across the bench, a band to land in, and the last one to compare against. The bar fills towards the target and the in-range marker appears when you are within two seconds of it. Built for the M5Stack Core2, which is the right size to sit next to a grinder. Exported as MicroPython so the target and the band are things you can change from the REPL between shots rather than between builds.