Scale signal to a given range
Given the signal $\mathbf{x}$, you can scale the values of $\mathbf{x}$ to fall on the interval $[a,b]$ with

x_scaled = (x-min(x))*(b-a)/(max(x)-min(x)) + a;


Be aware that this is a very naive scaling, but it is the best you can do without any extra information.  When I say naive, I mean that it assumes that the scaled signal should always have a minimum value of $a$ and a maximum value of $b$.