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diff --git a/spaghetti-monster/fsm-standby.h b/spaghetti-monster/fsm-standby.h
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+++ b/spaghetti-monster/fsm-standby.h
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+/*
+ * fsm-standby.h: standby mode functions for SpaghettiMonster.
+ *
+ * Copyright (C) 2017 Selene ToyKeeper
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef FSM_STANDBY_H
+#define FSM_STANDBY_H
+
+// deferred "off" so we won't suspend in a weird state
+// (like...  during the middle of a strobe pulse)
+// set this to nonzero to enter standby mode next time the system is idle
+volatile uint8_t go_to_standby = 0;
+
+#define standby_mode sleep_until_eswitch_pressed
+void sleep_until_eswitch_pressed();
+
+#ifdef USE_IDLE_MODE
+// stops processing until next click or timer tick
+// (I think)
+void idle_mode();
+#endif
+
+// TODO: half-sleep "twilight" mode with WDT on but running slowly
+
+#endif