Final answer:
The pin that is NOT on the HC-SR04 sensor is e) Signal. The HC-SR04 has pins for power supply (VCC), ground (GND), initiating ultrasonic pulses (Trig), and receiving the pulse (Echo).
Step-by-step explanation:
The pin that is NOT on the HC-SR04 sensor is e) Signal. The HC-SR04 is an ultrasonic sensor that measures distance by sending out an ultrasonic wave and then listening for its echo. The pins on the HC-SR04 sensor are:
- GND (Ground)
- Trig (Trigger)
- VCC (Voltage supply)
- Echo (Echo signal)
The Signal pin is not present on this sensor; instead, the Echo pin is used to carry the signal indicating the return of the ultrasonic pulse. Remember, each pin serves a specific function for the operation of the sensor:
- VCC is for power supply,
- GND is the ground connection,
- Trig is to initiate the ultrasonic pulse,
- Echo is to receive the pulse once reflected back.