1. Welcome ! Presented By Vatsal Shah IU1241090055 INDUSUNIVERSITY Presentation On : Flex Sensor Electronics & Communication Dept. 5 th Semester

2. VATSAL N SHAH2 Application What is Flex Sensor ? How they Work? Schematics Characteristics Project Problems

3.  A Flex and Force sensor. This is a flexible sensor which changes its output when it is bent or when force is applied on it.  This sensor has two output wires.  The resistance between these two wires varies when the sensor is bent or when subjected to a force. Hence, this sensor can be used as a flex or force sensor.  When the sensor is kept straight with no force acting on it, it has a resistance of around 10 K Ohms. Flex Sensors VATSAL N SHAH3

4. 4  When the sensor is bent in either way, or when force is applied on the sensor, the resistance between these two wires increases proportionally to the amount of bending.  They convert the change in bend to electrical resistance - the more the bend, the more the resistance value.  They are usually in the form of a thin strip from 1"-5" long that vary in resistance from approximately 10 to 50 kilohoms.

5. VATSAL N SHAH5 Application What is Flex Sensor ? How they Work? Schematics Characteristics Project Problems

6. Basic Circuit:  Flex Sensor as Voltage Divider - Output voltage increases with the bend.  The impedance buffer in the circuit reduces error due to source impedance of the flex sensor as voltage divider.  Suggested op amps are the LM358 or LM324.  We can also test our flex sensor using simple test, and skip op-amp. VATSAL N SHAH6 Schematics

7. R (Flex Sensor)Vout 9.48 kΩ1.78 V 15.3 kΩ1.69 V 17.0 kΩ1.59 V 21.2 kΩ1.36 V 22.7 kΩ1.32 V Flex Sensor – Test & Data VATSAL N SHAH

8. 8 Application What is Flex Sensor ? How they Work? Schematics Characteristics Project Problems

9.  Flex sensors are analog resistors. They work as variable analog voltage dividers.  Inside the flex sensor are carbon resistive elements within a thin flexible substrate.  When the substrate is bent the sensor produces a resistance output relative to the bend radius.  With a typical flex sensor, a flex of 0 degrees will give 10K resistance will a flex of 90 will give 30-40 K ohms.  The Bend Sensor lists resistance of 30-250 K ohms.. VATSAL N SHAH9 How they Work

10. VATSAL N SHAH10

11. VATSAL N SHAH11 Application What is Flex Sensor ? How they Work? Schematics Characteristics Project Problems

12. VATSAL N SHAH12  Size: approx. 0.28" wide and 1"/3"/5" long  Resistance Range:1.5-40K Ω  Temperature Range: -35 to +80°C  Voltage: 5 to 12 V Electrical Characteristics Characteristics

13. VATSAL N SHAH13 Application What is Flex Sensor ? How they Work? Schematics Characteristics Project Problems

14.  Used copper tape to fix the problem  Only one working flex sensor  Reduced accuracy to differentiate between gestures  Broke due to heat Problems 14VATSAL N SHAH

15. 15 Application What is Flex Sensor ? How they Work? Schematics Characteristics Project Problems

16. 4. Gaming Glove 2. Auto Control2. Auto Control…………………………….. 5. Horn Switch ……………………… ………………….. ……………………………………… ……………... 1. Toys 3. Fitness Products VATSAL N SHAH16

17. VATSAL N SHAH17 Application What is Flex Sensor ? How they Work? Schematics Characteristics Project Problems

18. The parts required: AArduino UNO 110 x Red LEDs 99 x 330 Ohm resistors for the LEDs 11 x 10K Ohm resistors for the flex sensor. 11 x Flex sensor WWires and Breadboard to connect it all together VATSAL N SHAH18 Project

19. VATSAL N SHAH19

20. VATSAL N SHAH20 References : http://forum.arduino.cc/index.php?PHPSESSID=los7pd7c6mjj40j78bcm5vudp6&topic=7088 3.msg527105#msg527105 http://forum.arduino.cc/index.php?PHPSESSID=los7pd7c6mjj40j78bcm5vudp6&topic=7088 3.msg527105#msg527105 http://sensorwiki.org/doku.php/sensors/flexion http://itp.nyu.edu/physcomp/sensors/Reports.Flex http://www.flexpoint.com/companyInfo/about.htm https://www.youtube.com/watch?v=ZJiwaAKHMNw https://www.sparkfun.com/products/10264 http://www.instructables.com/id/How-to-Make-Bi-Directional-Flex-Sensors/ http://www.imagesco.com/sensors/flex-sensor.html http://infusionsystems.com/catalog/product_info.php/products_id/54 http://www.digikey.com/us/en/ph/SpectraSymbol/flex_sensor.html http://www.adafruit.com/products/182 https://www.inventables.com/technologies/bend-sensor http://devices.sapp.org/component/flex/ http://www.nskelectronics.com/flex_sensor.html http://arduinobasics.blogspot.in/2011/05/arduino-uno-flex-sensor-and-leds.html

21. VATSAL N SHAH21

22. Thank You For Your Attention ! VATSAL N SHAH INDUS UNIVERSITY