The following project holds all the required files, and information to build a battery powered digital min/max thermometer.
The project is intended to be simple, reliable, and cheap.
Monero (XMR): 8BG1wFgq4fTKhekEh58Ae1M1ShGUsp15yFXJUuCXYQiFKUmDuQ9BK8tTfUfvXV2WR1CPE5Ry6DY45DmdDQm3SiCY7Jkw5ws
Bitcoin (BTC): bc1qvx8jt2qxar7thnxczqalzeyspd0xz8xr046edu