diff --git a/fw/HackSpaceCon_AS7/.vs/HackSpaceCon_AS7/v14/.atsuo b/fw/HackSpaceCon_AS7/.vs/HackSpaceCon_AS7/v14/.atsuo
index 9059c35..2c86507 100644
Binary files a/fw/HackSpaceCon_AS7/.vs/HackSpaceCon_AS7/v14/.atsuo and b/fw/HackSpaceCon_AS7/.vs/HackSpaceCon_AS7/v14/.atsuo differ
diff --git a/fw/HackSpaceCon_AS7/HSC_Wand/wand_program.cpp b/fw/HackSpaceCon_AS7/HSC_Wand/wand_program.cpp
index 3cffe0a..edb92c8 100644
--- a/fw/HackSpaceCon_AS7/HSC_Wand/wand_program.cpp
+++ b/fw/HackSpaceCon_AS7/HSC_Wand/wand_program.cpp
@@ -79,19 +79,17 @@ uint8_t rgbprog_idx = 0;
 
 
 
-void idle_cpu()
+void sleep_cpu(uint8_t sleep_type)
 {
-	SLPCTRL.CTRLA = SLPCTRL_SMODE_IDLE_gc | SLPCTRL_SEN_bm;
+	// TCA interrupt is used by arduino timing routines
+	// needs to be disabled while asleep to save power
+	TCA0.SPLIT.CTRLA &= ~TCA_SPLIT_ENABLE_bm;
+	
+	// configure for idle mode, then idle
+	SLPCTRL.CTRLA = sleep_type | SLPCTRL_SEN_bm;
 	__asm("sleep");
 }
 
-void sleep_cpu()
-{
-	SLPCTRL.CTRLA = SLPCTRL_SMODE_STDBY_gc | SLPCTRL_SEN_bm;
-	__asm("sleep");
-}
-
-
 // mcu init
 void setup() {
 	// configure PA2 as falling edge interrupt for button
@@ -120,19 +118,22 @@ void setup() {
 
 // mcu program loop
 void loop() {
+	// if something other than TCB0 or PA2 going low wakes us, we don't care
+	// sleep with prior sleep settings until we're ready to run next rgb prog step
 	while (!rgb_run_next) {
-		// __asm("sleep");
+		__asm("sleep");
 	}
 	
+	// re-enable TCA0 since arduino core uses it
+	TCA0.SPLIT.CTRLA |= TCA_SPLIT_ENABLE_bm;
+	
+	// clear run flag for next go
 	rgb_run_next = 0;
 		
 	switch (run_rgbprog) {
 		case RGB_INIT: {						// just started running a program
 			digitalWrite(PIN_LED_PWRENA, HIGH);	// enable LED power supply,
 			delay(15);							// wait a moment for LEDs to stabilize,
-			/*for (uint16_t i = 0; i < (8000000UL / 4 / 1000) * 20; i++) {
-				asm("nop");
-			}*/
 
 			rgbprog_idx++;						// select the next program in sequence,
 			if (rgbprog_idx >= PROG_COUNT) {
@@ -144,7 +145,7 @@ void loop() {
 
 			enable_rgb_timer();					// then start the RGB program timebase.
 
-			idle_cpu();							// we can idle CPU after running the program
+			sleep_cpu(SLPCTRL_SMODE_IDLE_gc);	// we can idle CPU after running the program
 
 			break;
 		}
@@ -157,7 +158,7 @@ void loop() {
 				break;
 			}
 
-			idle_cpu();							// we can idle CPU after running the program
+			sleep_cpu(SLPCTRL_SMODE_IDLE_gc);	// we can idle CPU after running the program
 
 			break;
 		}
@@ -166,7 +167,7 @@ void loop() {
 			rgb.show();							// send final updates to the led
 			run_rgbprog = RGB_IDLE;
 			
-			idle_cpu();							// we can idle CPU after running the program
+			sleep_cpu(SLPCTRL_SMODE_IDLE_gc);	// we can idle CPU after running the program
 			
 			break;
 		}
@@ -176,7 +177,7 @@ void loop() {
 			digitalWrite(PIN_LED_PWRENA, LOW);	// disable LED power supply,
 			run_rgbprog = RGB_IDLE;				// and clear run_rgbprog.
 
-			sleep_cpu();						// finally, go to sleep in standby mode
+			sleep_cpu(SLPCTRL_SMODE_STDBY_gc);	// finally, go to sleep in standby mode
 
 			break;
 		}