6 files changed, 54 insertions, 2 deletions
diff --git a/src/brain/bias_node.cpp b/src/brain/bias_node.cpp
new file mode 100644
index 0000000..99ae70d
--- /dev/null
+++ b/src/brain/bias_node.cpp
@@ -0,0 +1,6 @@
+#include "brain/bias_node.h"
+
+BiasNode::BiasNode()
+    :NeuralNode('b', 0)
+{
+}
diff --git a/src/brain/neural_link.cpp b/src/brain/neural_link.cpp
new file mode 100644
index 0000000..d217236
--- /dev/null
+++ b/src/brain/neural_link.cpp
@@ -0,0 +1,11 @@
+#include "brain/neural_link.h"
+
+NeuralLink::NeuralLink(double weight)
+    :_weight(weight)
+{
+}
+
+double NeuralLink::weightedActivation() const
+{
+    return _input->activation()*_weight;
+}
diff --git a/src/brain/neural_network.cpp b/src/brain/neural_network.cpp
index 980d5bc..c3e9f33 100644
--- a/src/brain/neural_network.cpp
+++ b/src/brain/neural_network.cpp
@@ -5,11 +5,11 @@ NeuralNetwork::NeuralNetwork(std::istream &&networkConfigFile, int numberOfSenso
 {
     for (int i=0; i<numberOfSensors; ++i)
     {
-	_sensors.push_back(std::make_shared<Sensor>());
+	_sensors.push_back(std::make_shared<Sensor>(i));
     }
     for (int i=0; i<numberOfOutputs; ++i)
     {
-	_outputs.push_back(std::make_shared<Neuron>());
+	_outputs.push_back(std::make_shared<Neuron>(i));
     }
 }
 
diff --git a/src/brain/neural_node.cpp b/src/brain/neural_node.cpp
new file mode 100644
index 0000000..9bdd7c6
--- /dev/null
+++ b/src/brain/neural_node.cpp
@@ -0,0 +1,6 @@
+#include "brain/neural_node.h"
+
+NeuralNode::NeuralNode(char type, int id)
+    :_type(type), _id(id)
+{
+}
diff --git a/src/brain/neuron.cpp b/src/brain/neuron.cpp
new file mode 100644
index 0000000..8c2e47c
--- /dev/null
+++ b/src/brain/neuron.cpp
@@ -0,0 +1,24 @@
+#include "brain/neuron.h"
+#include <cmath>
+
+Neuron::Neuron(int id)
+    :NeuralNode('n', id)
+{
+}
+
+double Neuron::sigmoid(double input) const
+{
+    double slope = 4.924273;
+    double constant = 2.4621365;
+    return (1/(1+(std::exp(-(slope*input)))));
+}
+
+double Neuron::activation() const
+{
+    double activationSum = 0;
+    for (auto link : _inputLinks)
+    {
+	activationSum += link->weightedActivation();
+    }
+    return sigmoid(activationSum);
+}
diff --git a/src/brain/sensor.cpp b/src/brain/sensor.cpp
new file mode 100644
index 0000000..3069659
--- /dev/null
+++ b/src/brain/sensor.cpp
@@ -0,0 +1,5 @@
+#include "brain/sensor.h"
+
+Sensor::Sensor(int id)
+    :NeuralNode('s', id)
+{}