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Variable Motor Speed with Force Sensor
Overview¶
This project demonstrates the use of Flexible Force Sensor to control speed of a motor linearly with force applied. As force applied increases, the speed of motor increases. In addition to this, an RGB LED is used to depict the speed range of motor. Also, the speed scaled to 0.0-1.0 is displayed on LCD.
Flex Sensor¶
The FlexiForce sensor acts as a force sensing resistor in an electrical circuit. When the force sensor is unloaded, its resistance is very high. When a force is applied to the sensor, this resistance decreases. The resistance can be measured by a multimeter, then applying a force to the sensing area
Wiring¶
| Mbed | FlexiForce Sensor | RGB LED | Motor Switch | uLCD |
|---|---|---|---|---|
| VOUT (3.3V) | Terminal 1 | |||
| VU (5V) | 5V | |||
| GND | GND | GND | ||
| p20 (Analog In) | Terminal 3 | |||
| p24 (PWM Out) | Red | |||
| p23 (PWM Out) | Green | |||
| p22 (PWM Out) | Blue | |||
| p21 (PWM Out) | Base of 2N3904 | |||
| TX (p28) | RX | |||
| RX (p27) | TX | |||
| RX (p30) | Reset |