21 lines
1020 B
Markdown
21 lines
1020 B
Markdown
# Oil sensor
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Using an ultra sonic sensor, it detects the amount of oil used for heating.
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For optimization purposes, it uses 2 microcontrollers:
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#### **Arduino Pro Mini**
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It offers a precise quartz clock, required by the ultra sonic sensor to accurately determine the level of oil in the tank. But because it has a high consumption, it is not suited for battery powered devices.
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#### **ATTiny85**
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It has an inaccurate quartz clock that cannot be used for the sonar sensor, but it is more than enough to be used as a wake-up device for Arduino Pro Mini. Due to the very low power consumption, it is ideal for battery powered devices.
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## Mode of operation
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ATTiny85 is connected directly to the battery and acts as a power switch:
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1. on regular intervals, ~6 hours, it powers on the Arduino Pro Mini
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1. Arduino Pro Mini will:
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- read the oil tank level
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- send the information to the RC Gateway
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- signal the ATTiny85 that it has finished
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1. turns off the Arduino Pro Mini
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