diff --git a/CMakeLists.txt b/CMakeLists.txt
index 39307be..d2a7445 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,6 +17,7 @@ add_executable(vibe-check
     # lib/rtt/RTT/SEGGER_RTT.c
     src/stdio_rtt.c
     src/main.c
+    src/state.c
     src/vibe_bt.c
 )
 
diff --git a/src/main.c b/src/main.c
index 741e019..52ab993 100644
--- a/src/main.c
+++ b/src/main.c
@@ -4,6 +4,7 @@
 #include "pico/btstack_cyw43.h"
 #include "pico/cyw43_arch.h"
 #include "pico/stdlib.h"
+#include "state.h"
 #include "stdio_rtt.h"
 #include "vibe_bt.h"
 #include <stdio.h>
@@ -38,6 +39,10 @@ int main() {
 	l2cap_init();
 	sm_init();
 
+	// set initial state
+	state_init();
+	state_set_power(0);
+
 	att_server_init(profile_data, bt_att_read_callback, bt_att_write_callback);
 
 	hci_event_callback_registration.callback = &bt_packet_handler;
diff --git a/src/state.c b/src/state.c
new file mode 100644
index 0000000..665b807
--- /dev/null
+++ b/src/state.c
@@ -0,0 +1,10 @@
+#include "state.h"
+
+void state_init() {
+	// TODO: Assign GPIO pins to PWM.
+	state_set_power(0);
+}
+
+void state_set_power(uint8_t power) {
+	// TODO: Set power!
+}
diff --git a/src/state.h b/src/state.h
new file mode 100644
index 0000000..0a6e097
--- /dev/null
+++ b/src/state.h
@@ -0,0 +1,12 @@
+#ifndef HARDWARE_H
+#define HARDWARE_H
+
+#include <stdint.h>
+
+// Initializes wand state.
+void state_init();
+
+// Sets the wand's power, 0-100.
+void state_set_power(uint8_t power);
+
+#endif
diff --git a/src/vibe_bt.c b/src/vibe_bt.c
index 84d7adc..d515546 100644
--- a/src/vibe_bt.c
+++ b/src/vibe_bt.c
@@ -1,4 +1,5 @@
 #include "vibe_bt.h"
+#include "state.h"
 #include "vibe.h"
 #include <stdio.h>
 
@@ -104,9 +105,10 @@ int bt_att_write_callback(
 		return 0;
 	if (memcmp(buffer + 8, "\x00\x64\xDF\x55", 4) != 0)
 		return 0;
+	uint8_t power = buffer[7];
 
-	// In case it somehow came unset
-	bt_connected = true;
-	printf("!! Write of %d\n", buffer[7]);
+	bt_connected = true; // In case it somehow came unset
+	state_set_power(power);
+	printf("!! Setting power to %d%%\n", power);
 	return 0;
 }