
Using a Flex Sensor — SIK Circuit 9
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
Vật liệu cho bước này:
SparkFun Inventors Kit - V3.21 bộ
Arduino Uno R31 cái
Breadboard1 cái
Flex Sensor1 cái
Servo Motor1 cái
10K Ohm Resistor1 cái
Jumper Wires7 cáiCông cụ cần thiết:
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.
Vật liệu cho bước này:
Flex Sensor1 cái
Servo Motor1 cái
10K Ohm Resistor1 cái
Breadboard1 cái
Jumper Wires7 cáiArduino Code
Arduino Code
Open the Arduino IDE and upload the following sketch to your Arduino board.
Vật liệu cho bước này:
Arduino Uno R31 cáiCông cụ cần thiết:
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
7- $105.00
- 1 cáiTạm thời
- 1 cáiTạm thời
- 1 cáiTạm thời
- 1 cáiTạm thời
- $3.00
You can swap these in
Can't get one of the materials? Swap it for an equivalent — these work just as well.
- Instead of Arduino Uno R3, try:
Prototyping Shield for Arduino Uno (3-Pack)
Arduino Uno R3 Board
Arduino Uno - Instead of Servo Motor, try:
Vibration Motor Assortment
SG90 Micro Servo Motor (5-Pack)
Marine Brushless Motor
Vibration Motor
Stepper Motor - 125 oz.in (200 steps/rev) - Instead of Flex Sensor 2.2 Inch, try:
Bare Solar Cell 6x6 inch
Magnet Square - 0.25 inch - Instead of Resistor 10K Ohm 1/6th Watt PTH - 20 pack, try:
Resistor 330 Ohm 1/6 Watt PTH - 20 pack
AVR ISP Shield - PTH Kit
Recommended for this build
Products makers often use with builds like this one.
Diode KitUsed together and in similar builds
BC547 NPN Transistor (50-Pack)Used together and in similar builds
Resistor 330 Ohm 1/6 Watt PTH - 20 packUsed together and in similar builds
5mm LED Assortment Kit (300pcs, 5 Colors)Used together and in similar builds
Temperature SensorUsed in similar builds
DC MotorUsed in similar builds
Relay ModuleUsed in similar builds
USB CableUsed together and in similar buildsRelated blueprints
Other builds that share materials, tools, or techniques with this one.






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