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Gold for these 27K resistors
small motor
These are Metal Film Resistor with a value of 68 ohm 1W and tolerance of ±5%
To begin pumping water
This is a membrane keypad with no moving parts
LM393 -Low Power Low Offset Voltage Dual Comparator transistor Gold for these 27K resistorsThese devices consist of two independent voltage comparators that are designed to operate from a single power supply over a wide range of voltages. Operation from dual supplies also is possible as long as the difference between the two supplies is 2 V to 36 V, and VCC is at least 1. 5 V more positive than the input common mode voltage. Current drain is independent of the supply voltage. The outputs can be connected to other open collector outputs to