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Can I use Force Sensitive Resistor with multilink central?

I am using two nrf51822 ek. one is programmed with multilink central and other is programmed with multilink peripheral. when i press the button on multilink peripheral, i get the notification on multilink central. but i want to do this with external sensor, here I am using Force sensitive resistor. what I have already done, that first I found which nrf51 chip pins are connected to button, when I found this , I connected my sensor to those pins.. it worked , but it worked like a button, when it sensed first time, Led is on , and when it sensed second time LED is off. I dont want this. I want that when it doesnot sense, the LED must be off. it dont have to be sensed 2nd time to make LED off. PLz help, what can be the changes i can do now?

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