diff --git a/src/ADC/ADC.c b/src/ADC/ADC.c
new file mode 100644
index 0000000..be0ff82
--- /dev/null
+++ b/src/ADC/ADC.c
@@ -0,0 +1,112 @@
+/*
+ * Author: username
+ * Date: 2024 
+ * filename: ADC.c
+ * description: module_purpose
+ */
+
+#ifndef __AVR_ATtiny404__
+#define __AVR_ATtiny404__
+#endif
+
+#include "ADC.h"
+#include "RegEdit.h"
+#include "avr/io.h"
+
+#define MAX_PIN_NUM 7
+
+static bool IsInvalidPin(uint8_t pin_num){
+    if(pin_num > MAX_PIN_NUM){
+        return true;
+    }
+    return false;
+}
+
+
+void ADC_Setup(void)
+{
+    //Clears control register A for ADC0
+    RegEdit_SetNum((void *) &ADC0.CTRLA, 0x00);
+
+    //Sets The sample accumulation number to 32.
+    RegEdit_SetNum((void *) &ADC0.CTRLB, 0x5);
+
+    //Sets the voltage reference to VDD or VCC.
+    RegEdit_SetBit((void *) &ADC0.CTRLC, 4);
+
+    //Sets the pre-scalar for the adc sample rate.
+    RegEdit_SetBit((void *) &ADC0.CTRLC, 2);
+
+    //Setup an Initalization delay.
+    RegEdit_OR_Num((void *) &ADC0.CTRLD, (2<<5));
+
+    //Set the bit for ADC variation during readings.
+    RegEdit_SetBit((void *) &ADC0.CTRLD, 4);
+}
+
+void ADC_Init(uint8_t pin_num)
+{
+    
+    if(IsInvalidPin(pin_num)){return;}
+
+
+    //set the direction to input 
+    RegEdit_ClearBit((void *) &PORTA.DIR, pin_num);
+
+    //Disable the pull-up resistor
+    RegEdit_ClearBit((void *) &PORTA.OUT, pin_num); 
+ 
+    //Disable input buffer
+    //We do some kinda nasty address addition but it saves
+    //memory and means we don't need a switch statment.
+    RegEdit_SetBit(
+            (void *) (&PORTA.PIN0CTRL)+pin_num,
+            PORT_ISC_INPUT_DISABLE_gc
+            );
+ 
+}
+
+
+void ADC_Enable(void)
+{
+    //Set the enable bit in the CTRLA register
+    RegEdit_SetBit((void *) &ADC0.CTRLA, 0);
+}
+
+
+void ADC_Disable()
+{
+    //Clear the enable ADC flag
+    RegEdit_ClearBit((void *) &ADC0.CTRLA, 0);
+}
+
+
+void ADC_SetPin(uint8_t pin_num)
+{
+    if(IsInvalidPin(pin_num)){return;}
+    RegEdit_ClearRegister((void *) &ADC0.MUXPOS);
+    RegEdit_SetNum((void *) &ADC0.MUXPOS, pin_num);
+}
+
+
+uint16_t ADC_ReadValue_Impl(uint8_t pin_num)
+{
+    RegEdit_SetNum((void *) &ADC0.COMMAND, ADC_STCONV_bm);
+
+    /* Wait until ADC conversion done */
+    while ( !(ADC0.INTFLAGS & ADC_RESRDY_bm) )
+    {
+        ;
+    }
+   
+    /* Clear the interrupt flag by writing 1: */
+    ADC0.INTFLAGS = ADC_RESRDY_bm;
+    
+    uint16_t adc_val = (uint16_t) ADC0.RES;
+    adc_val = adc_val >> 5;
+    return adc_val; 
+}
+
+
+//Set the default for the function pointer.
+uint16_t (*ADC_ReadValue)(uint8_t pin_num) = ADC_ReadValue_Impl;
diff --git a/src/ADC/ADC.h b/src/ADC/ADC.h
new file mode 100644
index 0000000..3792eab
--- /dev/null
+++ b/src/ADC/ADC.h
@@ -0,0 +1,74 @@
+/**
+ * @brief Interface to the AVR ADC hardware. 
+ * @details This file is...
+ * @author Jake G 
+ * @date 2024 
+ * @copyright None
+ * @file ADC.h
+ */
+
+#ifndef ADC_H
+#define ADC_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+
+
+/**
+ * @brief Initializes the AVR hardware in order to accept
+ * Input for ADC usage.
+ * @param pin_num The number of the pin 0-7 you are initializing.
+ *
+ * This function only makes use of PORTA by default. It sets the direction
+ * register to input, disables the pull-up resistor and also diables interrupts
+ * alongside the input buffer(digital).
+ *
+ * This in turn helps reduce noise when using the ADC.
+ * 
+ */
+void ADC_Init(uint8_t pin_num);
+
+
+/**
+ * @brief Enables the ADC 
+ */
+void ADC_Enable(void);
+
+
+/**
+ * @brief Disables the ADC
+ */
+void ADC_Disable();
+
+
+/**
+ * @brief Reads ADC value into variable
+ *
+ * @param pin_num The bin number of the ADC pin being read.
+ *
+ * This function depends on the ADC already being initialized and enabled 
+ * before being called.
+ */
+extern uint16_t (*ADC_ReadValue)(uint8_t pin_num);
+
+/**
+ * @brief Sets up the ADC
+ *
+ * This function sets up the ADC to take and accumulate 32 samples. It also
+ * sets the inital delay to 32 ADC clock cycles, and sets the VREF to VDD or
+ * VCC.
+ *
+ * This function should only need to be called once.
+ */
+void ADC_Setup(void);     
+
+
+/**
+ * @brief Sets the pin used in the MUX for ADC0.
+ *
+ * @param pin_num The number of the pin in Port A.
+ */
+void ADC_SetPin(uint8_t pin_num);
+
+#endif //ADC_H   
diff --git a/src/ADC/CMakeLists.txt b/src/ADC/CMakeLists.txt
new file mode 100644
index 0000000..3b39d8c
--- /dev/null
+++ b/src/ADC/CMakeLists.txt
@@ -0,0 +1,17 @@
+add_library(ADC STATIC
+    ADC.c
+)
+target_include_directories(ADC PUBLIC
+    ${CMAKE_CURRENT_LIST_DIR}
+)
+
+if(UNIT_TESTING)
+    target_link_libraries(ADC
+        MockRegEdit
+    )
+
+else()
+    target_link_libraries(ADC
+        RegEdit 
+    )
+endif()
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 49ebd28..96e9ac1 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -57,3 +57,6 @@ add_subdirectory(timer)
 
 add_subdirectory(SuperLoop)
 add_subdirectory(Relays)
+add_subdirectory(zero_cross_detection)
+add_subdirectory(ADC)
+add_subdirectory(load)
diff --git a/src/load/CMakeLists.txt b/src/load/CMakeLists.txt
new file mode 100644
index 0000000..a61e227
--- /dev/null
+++ b/src/load/CMakeLists.txt
@@ -0,0 +1,18 @@
+add_library(load STATIC
+    load.c
+)
+target_include_directories(load PUBLIC
+    ${CMAKE_CURRENT_LIST_DIR}
+)
+
+if(UNIT_TESTING)
+    target_link_libraries(load
+        MockRegEdit
+        MockADC
+    )
+else()
+    target_link_libraries(load
+        RegEdit
+        ADC
+    )
+endif()
diff --git a/src/load/load.c b/src/load/load.c
new file mode 100644
index 0000000..66787ff
--- /dev/null
+++ b/src/load/load.c
@@ -0,0 +1,75 @@
+/*
+ * Author: Jake G 
+ * Date: 2024 
+ * filename: load.c
+ * description: module_purpose
+ */
+
+#ifndef __AVR_ATtiny404__
+#define __AVR_ATtiny404__
+#endif
+
+
+#include <avr/io.h>
+#include "load.h"
+
+
+#ifndef UNIT_TESTING
+    #include "ADC.h"
+    #include "RegEdit.h"
+#else
+    #include "MockADC/MockADC.h"
+    #include "MockRegEdit.h"
+#endif
+
+
+
+//These two arrays allow us to track the A and B ports to know when
+//one has been disabled before.
+static bool porta_disabled[8] = {0};
+static bool portb_disabled[8] = {0};
+
+
+static bool valid_load(uint16_t val)
+{
+    if(val > 527 && val < 1000) {
+        return true;
+    }
+    return false;
+}
+
+void Load_HandleLoadPortA(uint8_t adc_pin, uint8_t out_pin)
+{
+    ADC_Init(adc_pin);
+    ADC_Enable();
+    ADC_SetPin(adc_pin);
+    uint16_t val = ADC_ReadValue(adc_pin);
+    
+    ADC_Disable();
+    if(valid_load(val) && !porta_disabled[adc_pin]){
+        RegEdit_SetBit((void *) &PORTA.DIR, out_pin);
+        RegEdit_SetBit((void *) &PORTA.OUT, out_pin);
+    }
+    else{
+        RegEdit_ClearBit((void *) &PORTA.OUT, out_pin);
+        porta_disabled[adc_pin] = true;
+    }
+}
+
+void Load_HandleLoadPortB(uint8_t adc_pin, uint8_t out_pin)
+{
+    ADC_Init(adc_pin);
+    ADC_Enable();
+    ADC_SetPin(adc_pin);
+    uint16_t val = ADC_ReadValue(adc_pin);
+        
+    ADC_Disable();
+    if(valid_load(val) && !portb_disabled[adc_pin]){
+        RegEdit_SetBit((void *) &PORTB.DIR, out_pin);
+        RegEdit_SetBit((void *) &PORTB.OUT, out_pin);
+    }
+    else{
+        RegEdit_ClearBit((void *) &PORTB.OUT, out_pin);
+        portb_disabled[adc_pin] = true;
+    }
+}
diff --git a/src/load/load.h b/src/load/load.h
new file mode 100644
index 0000000..1b3112f
--- /dev/null
+++ b/src/load/load.h
@@ -0,0 +1,32 @@
+/**
+ * @brief Module for handling the ADC input from the load pins.
+ * @details This file holds the functions for reading the ADC values.
+ * @author Jake G
+ * @date 2024
+ * @copyright None
+ * @file load.h
+ */
+
+#ifndef LOAD_H
+#define	LOAD_H
+
+/**
+ * @brief Low Threshold
+ *
+ */
+#define LOWTHRESH 527
+
+/**
+ * @brief High Threshold
+ *
+ */
+#define HIGHTHRESH 1000
+
+void Load_HandleLoadPortA(uint8_t adc_pin, uint8_t out_pin);
+void Load_HandleLoadPortB(uint8_t adc_pin, uint8_t out_pin);
+
+void Load_HandlePinLoads(void);
+
+
+#endif	/* LOAD_H */
+
diff --git a/src/zero_cross_detection/CMakeLists.txt b/src/zero_cross_detection/CMakeLists.txt
new file mode 100644
index 0000000..e0db991
--- /dev/null
+++ b/src/zero_cross_detection/CMakeLists.txt
@@ -0,0 +1,17 @@
+add_library(zero_cross_detection STATIC
+    zero_cross_detection.c
+)
+target_include_directories(zero_cross_detection PUBLIC
+    ${CMAKE_CURRENT_LIST_DIR}
+)
+
+
+if(UNIT_TESTING)
+    target_link_libraries(zero_cross_detection 
+        MockADC 
+    )
+else()
+    target_link_libraries(zero_cross_detection 
+        ADC 
+    )
+endif()
diff --git a/src/zero_cross_detection/zero_cross_detection.c b/src/zero_cross_detection/zero_cross_detection.c
new file mode 100644
index 0000000..7b81e1e
--- /dev/null
+++ b/src/zero_cross_detection/zero_cross_detection.c
@@ -0,0 +1,54 @@
+/*
+ * Author: Jake G 
+ * Date: 2024 
+ * filename: zero_cross_detection.c
+ * description: 
+ */
+
+#include "zero_cross_detection.h"
+
+#define TRIGGERVAL 512 
+
+#ifndef UNIT_TESTING
+#include "ADC.h"
+#else
+#include "MockADC/MockADC.h"
+#endif
+
+#define ZCD_PIN 0x07
+
+void ZCD_Setup(void)
+{
+    ADC_Init(ZCD_PIN);
+    ADC_SetPin(ZCD_PIN);
+    ADC_Enable();
+}
+
+bool ZCD_IsTriggered()
+{
+    uint16_t first, second;
+    ZCD_Setup();
+    first = ADC_ReadValue(ZCD_PIN);
+    ADC_Disable();
+    
+    ZCD_Setup();
+    second = ADC_ReadValue(ZCD_PIN);
+    ADC_Disable();
+
+    if(second < TRIGGERVAL){
+        return false;
+    }
+    if(second < first){
+        return false;
+    }
+    return true;
+}
+
+void ZCD_Poll(void)
+{
+    while(true){
+        if(ZCD_IsTriggered()){
+            break;
+        }
+    }
+}
diff --git a/src/zero_cross_detection/zero_cross_detection.h b/src/zero_cross_detection/zero_cross_detection.h
new file mode 100644
index 0000000..16bf9af
--- /dev/null
+++ b/src/zero_cross_detection/zero_cross_detection.h
@@ -0,0 +1,49 @@
+/**
+ * @file zero_cross_detection.h
+ * @author Jake G
+ * @date 16 June 2024
+ * @brief File contains the zero cross detection functions 
+ *
+ * This file holds all the code/functions needed to read the value of the AC
+ * waveform. It uses the trigger value from the `config.h` file to evaluate the
+ * state.
+ *
+ * This module depends on the ADC.h module to get readings from the ADC 
+ * hardware.
+ */
+
+#ifndef ZERO_CROSS_DETECTION
+#define ZERO_CROSS_DETECTION
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/**
+ * @brief Zero Cross Detection Setup
+ *
+ * Sets up the hardware to read the values coming from the AC input waveform.
+ *
+ */
+void ZCD_Setup(void);
+//int ZCD_Setup(volatile uint8_t *ddrx, uint8_t *port, uint8_t pin);
+
+
+/**
+ * @brief Checks if ZCD should trigger on value
+ *
+ * The function checks for a positive edge first using the ZCD_IsPositiveEdge
+ * function. If a positive edge was found, then it takes an addition set of 
+ * samples and averages them; only triggering(returning true) in the case 
+ * that the average is higher than the previous sample. 
+ */
+bool ZCD_IsTriggered(void);
+
+
+/**
+ * @brief Function blocks execution until ZCD is triggered. 
+ *
+ */
+void ZCD_Poll(void);
+
+
+#endif //ZERO_CROSS_DETECTION