heat controlling circuit with flex sensor

Hi Folks,

I'm new to Arduino and I'm looking to integrate a flex sensor into my existing circuit. I'm heating two heat pads using 2 tip122 transistors. I can heat the two pads but I'm looking to substitute the button in the circuit with a flex sensor like this.

Basically what I'm looking to achieve is by bending the flex sensor it triggers the circuit which essentially heats the heat pads.

Can anyone help me with this, excuse my lack of knowledge but I'm new to arduino

Any help would be greatly appreciated.

Thanks

Liam