diff --git a/make.mk b/make.mk
index 8c8863bcb..4834f5213 100644
--- a/make.mk
+++ b/make.mk
@@ -243,3 +243,5 @@ endif
 ifdef CLOCK_FACE_24H_ONLY
 CFLAGS += -DCLOCK_FACE_24H_ONLY
 endif
+
+CFLAGS += -g
diff --git a/uv-calibration/dump-gdb b/uv-calibration/dump-gdb
new file mode 100644
index 000000000..8eda80ae5
--- /dev/null
+++ b/uv-calibration/dump-gdb
@@ -0,0 +1,16 @@
+set pagination off
+
+target remote :2331
+monitor halt
+monitor reset 2
+file build/watch.elf
+#load
+
+break ../watch_faces/sensor/si1133_uv_face.c:186
+command 1
+p new_reading
+append value raw/trace_log new_reading
+continue
+end
+
+continue
diff --git a/uv-calibration/raw/trace_log b/uv-calibration/raw/trace_log
new file mode 100644
index 000000000..a6f046216
Binary files /dev/null and b/uv-calibration/raw/trace_log differ
diff --git a/uv-calibration/unpack.py b/uv-calibration/unpack.py
new file mode 100644
index 000000000..01acc492a
--- /dev/null
+++ b/uv-calibration/unpack.py
@@ -0,0 +1,19 @@
+"""
+Turn gdb dump of uv readings from UV sensor watch into file
+"""
+
+import argparse
+import struct
+
+def main(filename: str):
+    with open(filename, "rb") as f:
+        buffer = f.read()
+    readings = [s[0] for s in struct.iter_unpack("<H", buffer)]
+    print(*readings, sep="\n")
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(prog = 'ProgramName')
+    parser.add_argument('filename')           # positional argument
+    args = parser.parse_args()
+    main(args.filename)
+