diff --git a/HRM_Processor.py b/HRM_Processor.py
index b6234c5..6b4e7c3 100644
--- a/HRM_Processor.py
+++ b/HRM_Processor.py
@@ -15,3 +15,39 @@ class HRM_Processor:
 
         self.input_data = DataReader.output_dict
         self.output_dict = {}
+        self.write_outputs_to_dict()
+
+    def write_outputs_to_dict(self):
+        """Writes all of the HRM_Processor's outputs to it's output
+        dictionary by calling the relevant functions to generate those outputs.
+
+        Returns
+        -------
+        None
+
+        """
+        voltage_extremes = self.determine_voltage_extremes(self.input_data[
+                                                          "voltage"])
+        self.output_dict["voltage_extremes"] = voltage_extremes
+
+    def determine_voltage_extremes(self, voltage):
+        """Determines the min and max values of the voltage data
+
+        Parameters
+        ----------
+        voltage:    numpy array
+                    Contains the voltage ad
+
+        Returns
+        -------
+        voltage_extremes:   tuple(float, float)
+                            A tuple containing the min and max values of the
+                            voltage data in the format (min, max)
+
+        """
+        voltage_min = np.amin(voltage)
+        voltage_max = np.amax(voltage)
+
+        voltage_extremes = (voltage_min, voltage_max)
+
+        return voltage_extremes

HRM_Processor must be able to determine voltage extremes 
The HRM_Processor requires functionality to determine the extremes of a voltage array, and output the min and max voltages as a tuple to the output dictionary. 

Input: numpy arrays containing voltage data
Output: a tuple containing the minimum and maximum values of the voltage data

The test for this feature will be whether or not the function that determines the voltage extremes reliably returns a tuple containing the min and maximum values of a numpy array.
diff --git a/conftest.py b/conftest.py
index 075fe64..e86293e 100644
--- a/conftest.py
+++ b/conftest.py
@@ -1,5 +1,6 @@
 import pytest
 from DataReader import DataReader
+from HRM_Processor import HRM_Processor
 
 
 @pytest.fixture
@@ -11,7 +12,7 @@ def dr():
 
 
 @pytest.fixture
-def hrm():
+def hrm(dr):
     """Create a basic HRM_Processor from the dr object"""
 
     hrm = HRM_Processor(dr)
diff --git a/test_HRM_Processor.py b/test_HRM_Processor.py
index 00a05d0..f0f5bac 100644
--- a/test_HRM_Processor.py
+++ b/test_HRM_Processor.py
@@ -1,6 +1,7 @@
 import pytest
 from DataReader import DataReader
 from HRM_Processor import HRM_Processor
+import numpy as np
 
 
 def test_HRM_Processor_init(dr):
@@ -18,3 +19,17 @@ def test_HRM_Processor_init(dr):
     """
     hrm_proc = HRM_Processor(dr)
     assert dr.output_dict == hrm_proc.input_data
+
+
+def test_voltage_extremes(hrm):
+
+    voltage = np.array([-1.502, -7.9, 3.5, 2.1, 8.7, 4.0])
+
+    voltage_extremes = hrm.determine_voltage_extremes(voltage)
+
+    assert voltage_extremes == (-7.9, 8.7)
+
+
+def test_write_outputs_to_dict_voltage_extremes(hrm):
+
+    assert hrm.output_dict["voltage_extremes"] == (10.0, 20.0)

pip install -r requirements.txt
parse_log_pytest
requirements.txt
pytest
3.9
requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
coverage==7.8.0
exceptiongroup==1.2.2
execnet==2.1.1
iniconfig==2.1.0
numpy==2.0.2
packaging==24.2
pep8==1.7.1
pluggy==1.5.0
pytest==8.3.5
pytest-cache==1.0
pytest-cov==6.0.0
pytest-pep8==1.0.6
tomli==2.2.1

name: bme590hrm
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.4.4=h6a678d5_1
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=3.0.16=h5eee18b_0
  - pip=25.0=py39h06a4308_0
  - python=3.9.21=he870216_1
  - readline=8.2=h5eee18b_0
  - setuptools=75.8.0=py39h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - tzdata=2025a=h04d1e81_0
  - wheel=0.45.1=py39h06a4308_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - coverage==7.8.0
      - exceptiongroup==1.2.2
      - execnet==2.1.1
      - iniconfig==2.1.0
      - numpy==2.0.2
      - packaging==24.2
      - pep8==1.7.1
      - pluggy==1.5.0
      - pytest==8.3.5
      - pytest-cache==1.0
      - pytest-cov==6.0.0
      - pytest-pep8==1.0.6
      - tomli==2.2.1
prefix: /opt/conda/envs/bme590hrm

test_HRM_Processor.py::test_voltage_extremes test_HRM_Processor.py::test_write_outputs_to_dict_voltage_extremes
test_HRM_Processor.py::test_HRM_Processor_init
HRM_Processor.py
HRM_Processor.py