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17. 三月 2026

Using a Flex Sensor — SIK Circuit 9

Use a flex sensor to control a servo motor. Bend the sensor to move the servo — combining analog input with motor control for gesture-based interaction.

说明

Parts & Introduction

A flex sensor changes resistance when bent. Combined with the servo from Circuit 8, you can create gesture-based controls — bend the sensor to move the servo. This combines analogRead() with the Servo library.

Parts Needed

1x Arduino Uno + USB cable
1x Breadboard
1x Flex Sensor
1x Servo Motor
1x 10KΩ Resistor
11x Jumper Wires

此步骤所需材料：

SparkFun Inventors Kit - V3.21 套件

Arduino Uno R31 个

Breadboard1 个

Flex Sensor1 个

Servo Motor1 个

10K Ohm Resistor1 个

Jumper Wires7 个

所需工具：

Computer with Arduino IDE

Hardware Hookup

Wiring Instructions

Flex Sensor

Connect one pin of the flex sensor to 5V.
Connect the other pin to Analog Pin A0.
Connect a 10K resistor from Analog Pin A0 to GND (voltage divider).

Servo

Connect Red wire to 5V.
Connect Black wire to GND.
Connect White wire to Digital Pin 9.

此步骤所需材料：

Flex Sensor1 个

Servo Motor1 个

10K Ohm Resistor1 个

Breadboard1 个

Jumper Wires7 个

Arduino Code

Open the Arduino IDE and upload the following sketch to your Arduino board.

flex_sensor.inoarduino

/*
SparkFun Inventor's Kit
Example sketch 09 — FLEX SENSOR

Use the flex sensor to change the position of a servo.

Hardware connections:
  Flex sensor: one pin to analog pin 0 (with 10K to GND), other pin to 5V
  Servo: RED to 5V, WHITE to pin 9, BLACK to GND

This code is completely free for any use.
*/

#include <Servo.h>

Servo servo1;

const int flexpin = 0;

void setup()
{
  Serial.begin(9600);
  servo1.attach(9);
}

void loop()
{
  int flexposition;
  int servoposition;

  flexposition = analogRead(flexpin);

  servoposition = map(flexposition, 600, 900, 0, 180);
  servoposition = constrain(servoposition, 0, 180);

  servo1.write(servoposition);

  Serial.print("sensor: ");
  Serial.print(flexposition);
  Serial.print("  servo: ");
  Serial.println(servoposition);

  delay(20);
}

此步骤所需材料：

Arduino Uno R31 个

所需工具：

Computer with Arduino IDE

Test & Experiment

What You Should See

The servo moves in response to bending the flex sensor. Open the Serial Monitor to see both the raw sensor value and the mapped servo position.

Troubleshooting

Servo not moving: Check servo wiring — easy to plug in backwards.
Sensor only works one way: The flex sensor bends in one direction. The striped side should face outward on a convex curve.
Limited range: Adjust the map() range values (600, 900) to match your sensor's actual readings from the Serial Monitor.