Minimalist temperature display by flashing one LED.
By flashing a LED, one can display 2 digit temperatures effectively.
The user counts the long flashes for tens, and the short dashes for ones.
e.g. 26 degrees is dash dash dit dit dit dit dit dit
This Raspberry Pi (RPI) python program reads a Dallas DS18B20 temperature sensor and makes its value known by flashing an LED.
For those with poor eyesight like me without my eyeglasses on, it works well from across the room.
First read https://learn.adafruit.com/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing/ds18b20
If you are not using GPIO 21 for the LED, then adjust the value of LED = 21 to the GPIO number you are using
Here is the debug output for the outside sensor reading 19687 raw (1.9687 Celsius) . Each line is a flash of the LED
firstloop for tens digit. i= 10000
Secondloop for ones digit. i= 9687
Secondloop for ones digit. i= 8687
Secondloop for ones digit. i= 7687
Secondloop for ones digit. i= 6687
Secondloop for ones digit. i= 5687
Secondloop for ones digit. i= 4687
Secondloop for ones digit. i= 3687
Secondloop for ones digit. i= 2687
Secondloop for ones digit. i= 1687
2023 6 11 , 18 : 24 inside= 24437 outside= 19687