diff --git a/states.h b/states.h
new file mode 100644
--- /dev/null
+++ b/states.h
@@ -0,0 +1,51 @@
+#ifndef STATES_H
+#define STATES_H
+
+typedef struct {
+    int32_t temp;
+    uint8_t temp_frac;
+    uint8_t state_resume;
+    uint8_t state;
+    int32_t setpoint;
+    uint8_t pid_enabled;
+} therm_status_t;
+
+typedef struct {
+    uint8_t boottobrew;
+    uint8_t temp_units;
+    uint16_t windup_guard;
+    uint16_t k_p;
+    uint16_t k_i;
+    uint16_t k_d;
+    uint8_t ignore_tc_error;
+    int16_t setpoint_brew;
+    int16_t setpoint_steam;
+} therm_settings_t;
+
+
+
+enum tempunits {
+    TEMP_UNITS_CELSIUS = 0,
+    TEMP_UNITS_FAHRENHEIT,
+};
+
+enum state {
+    STATE_IDLE = 0,
+
+    STATE_SETP,
+    STATE_SETI,
+    STATE_SETD,
+    STATE_SETSTEPS,
+    STATE_SETWINDUP,
+    STATE_SETBOOTTOBREW,
+    STATE_SETUNITS,
+
+    STATE_PREHEAT_BREW,
+    STATE_MAINTAIN_BREW,
+    STATE_PREHEAT_STEAM,
+    STATE_MAINTAIN_STEAM,
+
+    STATE_TC_ERROR
+};
+
+#endif