The hardware design of the LED Thermometer is straightforward. The WS2811 LED consumes one pin, and the 18B20 consumes one pin for data. Given the nature of both the WS8211 and 18B20, it's easy to add multiple pairs of temperature sensors and display LEDs chained back to the first one, the only issue being matching up the sequence of LEDs with the random nature of 18B20 addresses on the bus, but requiring them to be added one at a time and saving the station addresses in EEPROM could simplify the expansion process.