Motors & Sensors

Description:

When the QTI is exposed to light, the motor will spin faster. When the QTI sensor is taken away from light, the motor will spin slower.

Important Notes:

• Analog and digital pins are used in this project
• On the schematic, the TIP120 should be replaced with a QTi sensor
• When building the circuit, the transistor used should be a NPN transistor, not PNP

Materials:

• 1x Arduino uno
• 1x Breadboard
• 1x QTi sensor
• 9x male to male jumper wires
• 1x 2N3904 Transistor

Instructions:

1. Connect the QTi to the breadboard (pin to the far left should be placed in slot E5 and the pin to the far right should be placed in E7 *note - the TIP120 component on the schematic should be replaced by the QTi sensor
2. Take a wire, connect one end of the wire to the B pin on the QTi sensor (the pin closest to the left) and connect the other end to ground [negative] (A5:ground/negative)
3. Take a wire, connect one end of the wire to the W pin on the QTi sensor ( the pin closest to the right) and connect the other end of the wire to positive [VCC] (A7:positive/VCC)
4. Take a wire, connect one end of the wire to the middle pin on the QTi sensor and connect the other end of the wire to pin 1 on the DIGITAL side on the arduino (A6:1)
5. Connect the motor to the breadboard (negative pin should be inputted into E15, positive pin should be inputted into E17)
6. Take a wire, connect one end to the breadboard ensuring that one end is connected to the negative side of the motor and the other end is connected to negative[ground] on the breadboard (A15:ground/negative)
7. Connect a transistor to the breadboard so that the left pin (emitter/E) is in pin E22 and the right pin (collector/C) is in pin E24.
8. Take a wire, connect one end of the wire to the positive side of the motor (D17) and connect the other end of the wire to the emitter end of the transistor(D22)
9. Take a wire, Connect one end of the wire to the base pin of the transistor (A23) and connect the other end to pin A1 on the ANALOG side of the arduino.
10. Take a wire, connect one end to the emitter end of the transistor (A24) and the other end to positive/VCC on the breadboard
11. Take a wire, connect one end of the wire to positive [VCC] on the breadboard and connect the other end of the wire to 5V on the POWER side of the arduino
12. Take a wire, connect one end of the wire to ground on the breadboard and connect the other end of the wire to GND [ground] on the arduino

Schematic/Breadboard diagrams:

Demonstration:

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