diff --git a/src/detector.rs b/src/detector.rs
index ce140d6..0d6f141 100644
--- a/src/detector.rs
+++ b/src/detector.rs
@@ -18,9 +18,9 @@ use crate::{
     adc::AdcDriver,
     pwm::PwmDriver,
     rtc::GlobalRtc,
-    state::{DEVICE_STATE, DeviceState},
-    updates::{NET_CHANNEL, NetDataSender},
-    utils::{static_alloc, try_buffer, try_static_timestamped_block_vecs},
+    state::{DeviceState, DEVICE_STATE},
+    updates::{NetDataSender, NET_CHANNEL},
+    utils::{static_alloc, try_buffer, try_static_timestamped_block_vecs}, BLOCK_SIZE,
 };
 
 #[embassy_executor::task]
@@ -29,15 +29,15 @@ pub async fn detector_task(
     pwm: PwmDriver<'static>,
     rtc: GlobalRtc<'static>,
 ) {
+    info!("Waiting for RTC to start running");
     while !rtc.is_running().await {
-        info!("Waiting for RTC to start running");
         Timer::after_secs(2).await;
     }
     let net_data = NET_CHANNEL.sender();
     info!("Allocating detector resources");
 
     let blocks = unwrap!(
-        try_static_timestamped_block_vecs(4, 512),
+        try_static_timestamped_block_vecs(4, BLOCK_SIZE),
         "Couldn't allocate block buffers"
     );
 
@@ -51,7 +51,7 @@ pub async fn detector_task(
     let mut peaks = Vec::new();
 
     unwrap!(
-        peaks.try_reserve_exact(512),
+        peaks.try_reserve_exact(BLOCK_SIZE),
         "Failed to allocate peaks buffer"
     );
 
diff --git a/src/detector/data.rs b/src/detector/data.rs
index 77ae8b3..470a47b 100644
--- a/src/detector/data.rs
+++ b/src/detector/data.rs
@@ -20,7 +20,10 @@ pub(super) fn transmit_strike(
         .try_send(crate::updates::Update::Strike {
             timestamp,
             peaks: peaks.to_vec(),
-            samples: samples.to_vec(),
+            samples: samples
+                .iter()
+                .map(|&sample| (average as i16).saturating_sub_unsigned(sample))
+                .collect(),
             average,
         })
         .ok();
diff --git a/src/updates.rs b/src/updates.rs
index 129d4d6..db8d2b9 100644
--- a/src/updates.rs
+++ b/src/updates.rs
@@ -17,7 +17,7 @@ pub enum Update {
     Strike {
         timestamp: i64,
         peaks: Vec<u16>,
-        samples: Vec<u16>,
+        samples: Vec<i16>,
         average: u16,
     },
 }