im looking for a sensor that will change is resistance when it bends...can anybody help..thnx?

Question

it would be better if the sensor is thin and long...

Answer 1

Sounds like you are looking for a flex sensor..

Answer 2

I think that you may have better luck with a piezo-electric strain sensor that generates a voltage output for your application.

I have heard of black conductive foam used as a resistance-varying pressure sensor. The foam generally has a moderate resistance, that decreases as it is compressed (i.e. the attached electrodes are moved closer together during compression). It's not very reliable, but it works.

Another simple, but again not very reliable technique is to use a trace of a resistive material, such as a heavy mark of pencil graphite on a piece of paper or cardboard with a thin strip of metal such as brass up against it. As the two pieces are bent, it will change the pressure of piece of brass upon the trace, decreasing the resistance.

Answer 3

Images company & Jameco make a bend sensor , Interlink Electronics make a force-sensing resistor. see chapter five mobile robots by joseph l . jones, anita m. flynn & bruce a. seiger.

Answer 4

This is called a load cell it is found on all electric scales. They are also used in industrial equipment to limit forces.

See
http://glo.mt.com/mt/search/searchResults.jsp?QueryText=load+cells&Submit=Go&Fields=oid&Fields=META_CNTTYPE&Fields=text&Fields=V_Headline&Fields=V_Summary&Fields=RESULTS_GROUPING&Fields=product_status&Fields=CNTY&Fields=service_page_level&Fields=service_category&Fields=service_sbu&Fields=editorial_format&Fields=phased_out&scope=xhX2VscG1pcwiibG&ns=Jvd3lla192YW4iZH&st=Vud2

Answer 5

please use the strain Gauges, there are different type of stain gauges depending upon the types of applications