diff --git a/inc/states.h b/inc/states.h
new file mode 100644
--- /dev/null
+++ b/inc/states.h
@@ -0,0 +1,104 @@
+#ifndef STATES_H
+#define STATES_H
+
+#include "stm32f3xx_hal.h"
+#include "config.h"
+
+typedef struct {
+    float temp;
+    uint8_t state_resume;
+    uint8_t state;
+    float setpoint;
+    uint8_t pid_enabled;
+    uint8_t error_code;
+} therm_status_t;
+
+typedef union
+{
+     struct {
+        uint32_t boottobrew;
+        uint32_t temp_units;
+        uint32_t windup_guard;
+        uint32_t k_p;
+        uint32_t k_i;
+        uint32_t k_d;
+        int32_t temp_offset;
+        uint32_t ignore_error;
+        int32_t setpoint_brew;
+        int32_t setpoint_steam;
+        uint32_t control_mode;
+        uint32_t sensor_type;
+        uint32_t plant_type;
+        uint32_t hysteresis;
+    } val;
+
+    uint16_t data[128];
+} therm_settings_t;
+
+enum tempunits {
+    TEMP_UNITS_CELSIUS = 0,
+    TEMP_UNITS_FAHRENHEIT,
+};
+
+enum state {
+    STATE_IDLE = 0,
+
+	STATE_SETSENSORTYPE,
+    STATE_SETMODE,
+    STATE_SETPLANTTYPE,
+    STATE_SETHYSTERESIS,
+    STATE_SETP,
+    STATE_SETI,
+    STATE_SETD,
+    STATE_SETSTEPS,
+    STATE_SETWINDUP,
+    STATE_SETBOOTTOBREW,
+    STATE_SETUNITS,
+    STATE_SETTEMPOFFSET,
+
+    STATE_PREHEAT,
+    STATE_MAINTAIN,
+
+    STATE_TC_ERROR,
+	STATE_RESET,
+};
+
+enum control_mode {
+    MODE_PID = 0,
+    MODE_THERMOSTAT,
+};
+
+enum plant_type {
+    PLANT_HEATER = 0,
+    PLANT_COOLER,
+};
+
+enum GOTO_MODE {
+	#ifdef BOOTLOADER_SHORTCUT
+	MODE_BOOTLOADER,
+	#endif
+	MODE_HEAT,
+	MODE_SETUP,
+	MODE_RESET,
+	MODE_SIZE,
+};
+
+enum RESET_MODE {
+	RESET_REBOOT = 0,
+	RESET_DEFAULTS,
+	RESET_BOOTLOADER,
+	RESET_EXIT,
+	RESET_SIZE,
+};
+
+enum SENSOR_TYPE {
+	SENSOR_NTC = 0,
+	SENSOR_TC_K,
+	SENSOR_TC_E,
+	SENSOR_TC_N,
+	SENSOR_TC_R,
+	SENSOR_TC_S,
+	SENSOR_TC_T,
+};
+
+#endif