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Step 4Detecting when the water reached its boiling point:
A LEGO temperature sensor (ref# 9755) is connected to the RCX. The drawback of this sensor is its range: it only works at temperatures between -20 degrees C and 70 degrees C (-4 degrees F to 158 degrees F). That's a long way from the water boiling point 100 degrees C.
Thus, the LEGO temperature sensor had to be relocated to a spot where it reach its maximum range (approximately 70 degrees C) when at the same time, the water reach 100 degrees C.
Typically, it is approximately one Inch (35mm) above the water level.
The use of a DCP Microdevelopments ProTemp sensor (ref# D10047) dipped inside the pan would most likely get round this major drawback.
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