diff --git a/main.c b/main.c
--- a/main.c
+++ b/main.c
@@ -18,6 +18,8 @@ static __IO uint32_t TimingDelay;
 
 void init_gpio();
 void init_spi();
+void process();
+void machine();
 
 int main(void)
 {
@@ -50,6 +52,13 @@ RCC_APB2PeriphClockCmd(RCC_APB2Periph_SP
 
     while(1)
    {  
+        // Process sensor inputs [TODO: 5hz?]
+        process();
+
+        // Run state machine [TODO: 50hz?]
+        machine(); // this argument is sooo wrong
+        // probably just passed the actual port
+
         // TODO: Grab buttonpresses with interrupts
         uint8_t sw_btn = GPIO_ReadInputDataBit(SW_BTN);
         uint8_t sw_up = GPIO_ReadInputDataBit(SW_UP);
@@ -71,6 +80,193 @@ RCC_APB2PeriphClockCmd(RCC_APB2Periph_SP
     }
 }
 
+
+
+int32_t temp = 0;
+int32_t setpoint = 0;
+int32_t p = 1;
+int32_t i = 1;
+int32_t d = 1;
+
+// Process things
+void process()
+{
+    // Read MAX temp sensor
+    temp = 0;
+
+    // Perform PID calculations
+
+    // Write output to SSR
+}
+
+
+
+enum state {
+    STATE_IDLE = 0,
+    STATE_SETP,
+    STATE_SETI,
+    STATE_SETD,
+
+    STATE_PREHEAT_BREW,
+    STATE_MAINTAIN_BREW,
+    STATE_PREHEAT_STEAM,
+    STATE_MAINTAIN_STEAM,
+};
+
+
+uint8_t state = STATE_IDLE;
+
+// State machine
+void machine()
+{
+    
+    switch(state)
+    {
+        // Idle state
+        case STATE_IDLE:
+        {
+            // Write text to OLED
+            // [ therm :: idle ]
+
+            // Button handler
+            if(GPIO_ReadInputDataBit(SW_BTN)) {
+                state = STATE_SETP;
+            }
+
+            // Event Handler
+            // N/A
+
+        } break;
+
+        case STATE_SETP:
+        {
+            // Write text to OLED
+            // [ therm :: set p ]
+            // [ p = 12         ]
+
+            // Button handler
+            if(GPIO_ReadInputDataBit(SW_BTN)) {
+                state = STATE_IDLE;
+            }
+
+            // Event Handler
+            // N/A
+ 
+        } break;
+
+        case STATE_SETI:
+        {
+            // Write text to OLED
+            // [ therm :: set i ]
+            // [ i = 12         ]
+
+            // Button handler
+            if(GPIO_ReadInputDataBit(SW_BTN)) {
+                state = STATE_IDLE;
+            }
+
+            // Event Handler
+            // N/A
+ 
+        } break;
+
+        case STATE_SETD:
+        {
+            // Write text to OLED
+            // [ therm :: set d ]
+            // [ d = 12         ]
+
+            // Button handler
+            if(GPIO_ReadInputDataBit(SW_BTN)) {
+                state = STATE_IDLE;
+            }
+
+            // Event Handler
+            // N/A
+ 
+        } break;
+
+        case STATE_PREHEAT_BREW:
+        {
+            // Write text to OLED
+            // [ therm : preheating brew ]
+            // [ 30 => 120 C             ]
+
+            // Button handler
+            if(GPIO_ReadInputDataBit(SW_BTN)) {
+                state = STATE_IDLE;
+            }
+
+            // Event Handler
+            if(temp >= setpoint) {
+                state = STATE_MAINTAIN_BREW;
+            }
+ 
+        } break;
+
+        case STATE_MAINTAIN_BREW:
+        {
+            // Write text to OLED
+            // [ therm : ready to brew ]
+            // [ 30 => 120 C           ]
+
+
+            // Button handler
+            if(GPIO_ReadInputDataBit(SW_BTN)) {
+                state = STATE_IDLE;
+            }
+
+            // Event Handler
+            // N/A
+ 
+        } break;
+
+        case STATE_PREHEAT_STEAM:
+        {
+            // Write text to OLED
+            // [ therm : preheating steam ]
+            // [ 30 => 120 C           ]
+
+            // Button handler
+            if(GPIO_ReadInputDataBit(SW_BTN)) {
+                state = STATE_IDLE;
+            }
+
+            // Event Handler
+            if(temp >= setpoint) {
+                state = STATE_MAINTAIN_STEAM;
+            }
+ 
+        } break;
+
+        case STATE_MAINTAIN_STEAM:
+        {
+            // Write text to OLED
+            // [ therm : ready to steam ]
+            // [ 30 => 120 C            ]
+
+            // Button handler
+            if(GPIO_ReadInputDataBit(SW_BTN)) {
+                state = STATE_IDLE;
+            }
+
+            // Event Handler
+            // N/A
+ 
+        } break;
+
+
+        // Something is terribly wrong
+        deault:
+        {
+            state = STATE_IDLE;
+
+        } break;
+            
+    }
+}
+
+
 /**
   * @brief  Inserts a delay time.
   * @param  nTime: specifies the delay time length, in 1 ms.