diff --git a/src/laser_diode/current_sources.rs b/src/laser_diode/current_sources.rs
index f54afe5..4515fb7 100644
--- a/src/laser_diode/current_sources.rs
+++ b/src/laser_diode/current_sources.rs
@@ -9,7 +9,13 @@ use stm32f4xx_hal::{
     spi::{NoMiso, Spi, TransferModeNormal},
 };
 
+use uom::si::{
+    ratio::ratio,
+    f64::{ElectricPotential, ElectricCurrent},
+};
+
 use crate::laser_diode::max5719::{self, Dac};
+use crate::laser_diode::ld_drive::transimpedance_unit;
 
 pub trait ChannelPins {
     type PdMonPin;
@@ -82,4 +88,16 @@ impl CurrentSource {
     pub fn ld_short_disable(&mut self) {
         self.phy.current_source_short_pin.set_high();
     }
+
+    pub fn set_dac(&mut self, voltage: ElectricPotential, dac_out_v_max: ElectricPotential) -> ElectricPotential {
+        let value = ((voltage / dac_out_v_max).get::<ratio>()
+            * (max5719::MAX_VALUE as f64)) as u32;
+        self.phy.dac.set(value).unwrap();
+        voltage
+    }
+
+    pub fn set_i(&mut self, current: ElectricCurrent, transimpedance: transimpedance_unit, dac_out_v_max: ElectricPotential) -> ElectricCurrent {
+        let v = current * transimpedance;
+        self.set_dac(current * transimpedance, dac_out_v_max) / transimpedance
+    }
 }
\ No newline at end of file
diff --git a/src/laser_diode/ld_drive.rs b/src/laser_diode/ld_drive.rs
index d8ff846..0408ce4 100644
--- a/src/laser_diode/ld_drive.rs
+++ b/src/laser_diode/ld_drive.rs
@@ -85,4 +85,9 @@ impl LD_Drive{
         self.ctrl.ld_short_disable();
     }
 
+    pub fn ld_set_i(&mut self, i: ElectricCurrent) -> ElectricCurrent {
+        let ld_i_set = self.ctrl.set_i(i, Settings::LD_DRIVE_TRANSIMPEDANCE, Settings::DAC_OUT_V_MAX);
+        self.settings.ld_drive_current = ld_i_set;
+        ld_i_set
+    }
 }
\ No newline at end of file