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.
Hướng dẫn
Parts & Introduction
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
Hardware Hookup
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.
Arduino Code
Arduino Code
Open the Arduino IDE and upload the following sketch to your Arduino board.
/*
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);
}Test & Experiment
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.
Experiments to Try
- Build a "robot finger" that mimics your finger bending.
- Replace the servo with an LED and control brightness by bending.
Vật liệu
- •SparkFun Inventor's Kit - V3.2 - 1 kitNOK 999.20
- •Arduino Uno R3 - 1 pieceTạm thời
- •Breadboard - 1 pieceTạm thời
- •Flex Sensor - 1 pieceTạm thời
- •Servo Motor - 1 pieceTạm thời
- •10K Ohm Resistor - 1 pieceNOK 24.00
- •Jumper Wires - 11 piecessNOK 39.20
Công cụ yêu cầu
- Computer with Arduino IDE
CC0 Phạm vi công cộng
Bản thiết kế này được phát hành theo CC0. Bạn tự do sao chép, sửa đổi, phân phối và sử dụng cho bất kỳ mục đích nào mà không cần xin phép.
Hỗ trợ nhà sáng tạo bằng cách mua sản phẩm qua bản thiết kế, nơi họ nhận Hoa hồng nhà sáng tạo do nhà bán hàng đặt, hoặc tạo phiên bản mới và kết nối trong bản thiết kế riêng để chia sẻ doanh thu.