How to setup DS1820 One Wire for redundancy

hello everyone,

i have built device takes temperature input of ds1820 1 wire sensor , controls heat source accordingly.

this critical process. thats why want second sensor redundancy.

this should happen:

-both sensors hooked arduino
-both sensors working, temperature should read first sensor
-one sensor fails, temperature should read other sensor
-both sensors fail, shut off heating.

how accomplish this?

thanks!

if sensor1 = 127, read sensor 2.

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