diff --git a/.github/workflows/sfy-buoy.yml b/.github/workflows/sfy-buoy.yml
index d5804b71..6d972541 100644
--- a/.github/workflows/sfy-buoy.yml
+++ b/.github/workflows/sfy-buoy.yml
@@ -8,7 +8,6 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
-  BUOYPR: test.product
 
 jobs:
   build:
@@ -41,7 +40,7 @@ jobs:
 
       - name: Build (buoy)
         working-directory: sfy-buoy/sfy-artemis
-        run: cargo build --verbose
+        run: cargo build --verbose --release
 
       - name: Test (host-tests)
         working-directory: sfy-buoy/
@@ -51,3 +50,68 @@ jobs:
         working-directory: sfy-buoy/target-test
         run: cargo build --verbose --tests
 
+      - name: Build firmware (default)
+        working-directory: sfy-buoy/
+        run: |
+          mkdir -p target/bins
+          make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-default-no-storage.bin
+
+          CARGO_FLAGS="--features storage" make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-default-with-storage.bin
+
+      - name: Build firmware (5 min GPS)
+        working-directory: sfy-buoy/
+        run: |
+          mkdir -p target/bins
+          GPS_PERIOD=300 GPS_HEARTBEAT=-5 SYNC_PERIOD=20 make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-5min-gps-no-storage.bin
+
+          GPS_PERIOD=300 GPS_HEARTBEAT=-5 SYNC_PERIOD=20 CARGO_FLAGS="--features storage" make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-5min-gps-with-storage.bin
+
+
+      - name: Build firmware (surf)
+        working-directory: sfy-buoy/
+        run: |
+          mkdir -p target/bins
+          GPS_PERIOD=300 GPS_HEARTBEAT=-5 SYNC_PERIOD=20 CARGO_FLAGS="--features surf" make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-surf-no-storage.bin
+
+          GPS_PERIOD=300 GPS_HEARTBEAT=-5 SYNC_PERIOD=20 CARGO_FLAGS="--features surf,storage" make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-surf-with-storage.bin
+
+      - name: Build firmware (26Hz, 10min GPS, drifter)
+        working-directory: sfy-buoy/
+        run: |
+          mkdir -p target/bins
+          GPS_PERIOD=300 GPS_HEARTBEAT=-5 SYNC_PERIOD=20 CARGO_FLAGS="--features 20Hz" make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-26Hz-drifter-no-storage.bin
+
+          GPS_PERIOD=300 GPS_HEARTBEAT=-5 SYNC_PERIOD=20 CARGO_FLAGS="--features 20Hz,storage" make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-26Hz-drifter-with-storage.bin
+
+      - name: Build firmware (Mooring, 1h gps, 26Hz)
+        working-directory: sfy-buoy/
+        run: |
+          mkdir -p target/bins
+          GPS_PERIOD=3600 GPS_HEARTBEAT=1 SYNC_PERIOD=40 CARGO_FLAGS="--features 20Hz" make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-26Hz-mooring-no-storage.bin
+
+          GPS_PERIOD=3600 GPS_HEARTBEAT=1 SYNC_PERIOD=40 CARGO_FLAGS="--features 20Hz,storage" make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-26Hz-mooring-with-storage.bin
+
+      - name: Build firmware (Mooring, 1h gps, 52Hz)
+        working-directory: sfy-buoy/
+        run: |
+          mkdir -p target/bins
+          GPS_PERIOD=3600 GPS_HEARTBEAT=1 SYNC_PERIOD=40 make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-52Hz-mooring-no-storage.bin
+
+          GPS_PERIOD=3600 GPS_HEARTBEAT=1 SYNC_PERIOD=40 CARGO_FLAGS="--features storage" make T=r bin
+          mv target/sfy-buoy.bin target/bins/sfy-fw-52Hz-mooring-with-storage.bin
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: firmware
+          path: sfy-buoy/target/bins
diff --git a/sfy-buoy/sfy-artemis/src/main.rs b/sfy-buoy/sfy-artemis/src/main.rs
index 1c72a47a..d5a2d7a9 100644
--- a/sfy-buoy/sfy-artemis/src/main.rs
+++ b/sfy-buoy/sfy-artemis/src/main.rs
@@ -127,7 +127,7 @@ fn main() -> ! {
     delay.delay_ms(1_000u32);
 
     let i2c4 = i2c::I2c::new(dp.IOM4, pins.d10, pins.d9, i2c::Freq::F100kHz);
-    let i2c3 = i2c::I2c::new(dp.IOM3, pins.d6, pins.d7, i2c::Freq::F1mHz);
+    let i2c3 = i2c::I2c::new(dp.IOM3, pins.d6, pins.d7, i2c::Freq::F400kHz);
 
     // Set up RTC
     let mut rtc = hal::rtc::Rtc::new(dp.RTC, &mut dp.CLKGEN);