Variables in Tikz accepting integers only

I need to define xx as in {1,1.5,..10}, but the variable x always returns an integer number, any way how I can fix that. Thank you in advance.

 documentclass[borders=2cm]{standalone}
    
        usepackage{xcolor}
        definecolor{lava}{rgb}{0.81, 0.06, 0.13}
        definecolor{myblue}{rgb}{0.0, 0.30, 0.60}
        usepackage{tikz}
        usepackage{tikz-3dplot} 
        newenvironment{mycircuit}{%
    tdplotsetmaincoords{60}{110}
    defy{5} 
    defs{1} 
    defiAngle{45}
     pgfmathtruncatemacro{x}{xx/2 + s}
     pgfmathtruncatemacro{z}{1 + s}
    pgfmathsetmacro{thetavec}{45}
    pgfmathsetmacro{phivec}{60}
    
    begin{tikzpicture}[tdplot_main_coords,dot/.style = {circle, fill, minimum size=2pt,inner sep=0pt}]
    
    coordinate (O) at (0,0,0);
    
    tdplotsetcoord{P}{x}{thetavec}{phivec}
    tdplotsetcoord{P1}{z}{thetavec}{phivec}
    tdplotsetcoord{O1}{s}{thetavec}{phivec}
    
    draw[thick,->] (O)-- (y,0,0) node[anchor=north east]{$x$};
    draw[thick,->] (O) -- (0,y,0) node[anchor=north west]{$y$};
    draw[thick,->] (O) -- (0,0,y) node[anchor=south]{$z$};
    
    draw[-stealth,color=myblue,thick,sloped,dashed] (O1) -- node[below]{$tiny alphamathbf{F}$}(P)node[anchor=north](b){};
    draw[-stealth,color=lava,thick,sloped] (O1) --node[above]{$tiny mathbf{F}$}(P1)node[anchor=north](b){};
     node[black] at (-iAngle:z cm) {$ tiny 1<alpha< infty, alpha=x$};
    end{tikzpicture}
    }
    
    standaloneenv{mycircuit}
    begin{document}
    
     foreach xx in {2,3,...,10}{begin{mycircuit} 
     end{mycircuit}}
    end{document}

Update,  this is the updated version as per the advices that I received, now I need to round the numbers but I'm getting an error (capacity exceeded

newenvironment{mycircuit}{%
tdplotsetmaincoords{60}{110}
defy{5} 
defs{1} 
defiAngle{45}
pgfmathtruncatemacro{x}{xx/2 + s}
 pgfmathtruncatemacro{z}{1 + s}
pgfmathsetmacro{thetavec}{45}
pgfmathsetmacro{phivec}{60}
newcommand*{MyNum}[1]{%
    pgfmathprintnumber[
        precision=1,
        fixed zerofill=false,
        ]{##1}}%

begin{tikzpicture}[tdplot_main_coords,dot/.style = {circle, fill, minimum size=2pt,inner sep=0pt}]

coordinate (O) at (0,0,0);

tdplotsetcoord{P}{xx/2+s}{thetavec}{phivec}
tdplotsetcoord{P1}{z}{thetavec}{phivec}
tdplotsetcoord{O1}{s}{thetavec}{phivec}

draw[thick,->] (O)-- (y,0,0) node[anchor=north east]{$x$};
draw[thick,->] (O) -- (0,y,0) node[anchor=north west]{$y$};
draw[thick,->] (O) -- (0,0,y) node[anchor=south]{$z$};

draw[-stealth,color=myblue,thick,sloped,dashed] (O1) -- node[below]{$tiny alphamathbf{F}$}(P)node[anchor=north](b){};
draw[-stealth,color=lava,thick,sloped] (O1) --node[above]{$tiny mathbf{F}$}(P1)node[anchor=north](b){};
 node[black] at (-iAngle:z cm) {$S,alpha=MyNum{pgfmathparse{xx/4}pgfmathresult}$};
end{tikzpicture}
}

standaloneenv{mycircuit}
begin{document}
defS{1<alpha< infty}
%tiny 
 foreach xx in {4,5,...,20}{begin{mycircuit} 
 end{mycircuit}}
 defS{1>alpha< 0}
 foreach xx in {0.4,0.8,...,1.6}{begin{mycircuit} 
 end{mycircuit}}
 
defS{-1>alpha >- infty}
%tiny 
 foreach xx in {-4,-5,...,-20}{begin{mycircuit} 
 end{mycircuit}}
 
defS{-1<alpha< 0}
 foreach xx in {-0.2,-0.4,...,-2}{begin{mycircuit} 
 end{mycircuit}}
 
 
end{document}