diff --git a/firmware/src/main.rs b/firmware/src/main.rs
index 8666e22..651ff6a 100644
--- a/firmware/src/main.rs
+++ b/firmware/src/main.rs
@@ -128,8 +128,8 @@ fn main() -> ! {
     writeln!(stdout, "tecpak boot").unwrap();
     board::init();
     writeln!(stdout, "board initialized").unwrap();
-    let mut tec0 = Tec::tec0().setup(PWM_PID_WIDTH);
-    let mut tec1 = Tec::tec1().setup(PWM_PID_WIDTH);
+    let mut tec0 = Tec::tec0().setup(PWM_PID_WIDTH / 2, PWM_PID_WIDTH);
+    let mut tec1 = Tec::tec1().setup(PWM_PID_WIDTH / 2, PWM_PID_WIDTH);
 
     println!(r#"
   _                         _
diff --git a/firmware/src/tec.rs b/firmware/src/tec.rs
index 643bffe..3e7d7e9 100644
--- a/firmware/src/tec.rs
+++ b/firmware/src/tec.rs
@@ -76,10 +76,11 @@ impl Tec<pwm::T4CCP0, pwm::T4CCP1, pwm::T5CCP0, pwm::T5CCP1, GpioOutput<PP5>> {
 
 
 impl<MaxIPos: PwmChannel, MaxINeg: PwmChannel, ISet: PwmChannel, MaxV: PwmChannel, SHDN: OutputPin> Tec<MaxIPos, MaxINeg, ISet, MaxV, SHDN> {
-    pub fn setup(mut self, max: u16) -> Self {
+    pub fn setup(mut self, iset_width: u16, max: u16) -> Self {
         self.max_i_pos.set(max, max);
         self.max_i_neg.set(max, max);
         self.max_v.set(max, max);
+        self.i_set.set(iset_width, max);
         self
     }