- Positive DC terminal (higher voltage)
- Thermistor (temperature dependent resistor)
- Potentiometer (variable resistor)
- LDR (light dependent resistor)
- Resistor
- Ground (lower voltage)
- pin 13 of Arduino board
- PWV (pulse modulated voltage)
- isolating resistor
- NPN transistor
- ground (low voltage, not Arduino)
- motor
- battery +9V
- voltage spike safety circuit
- capacitor to store excess voltage
- diode (one way flow) to drain excess voltage
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