diff --git a/.cargo/config.toml b/.cargo/config.toml
index 0d031f6..657505f 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -20,5 +20,5 @@ target = "thumbv7em-none-eabihf" # Cortex-M4F and Cortex-M7F (with FPU)
 
 [env]
 # defmt filters log levels at COMPILE time; without this, info!/debug! are
-# stripped and only println! survives. "debug" enables debug/info/warn/error.
-DEFMT_LOG = "debug"
+# stripped and only println! survives. "info" enables info/warn/error.
+DEFMT_LOG = "info"
diff --git a/Cargo.toml b/Cargo.toml
index 8f28893..9f197e3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2024"
 [dependencies]
 # board support: re-exports the HAL as `f411::hal`, plus the L3gd20/Lsm303dlhc
 # interfaces and the `led` module
-f411 = { path = "../code/f411" }
+f411 = { path = "../f411" }
 
 cortex-m = "0.7.7"
 cortex-m-rt = "0.7.5"
diff --git a/etc/rotary.md b/etc/rotary.md
index 1299307..df136d2 100644
--- a/etc/rotary.md
+++ b/etc/rotary.md
@@ -29,33 +29,32 @@ Target board: **STM32F4-Discovery (STM32F411VE)**. Firmware: `src/main.rs`
 ## 2. Schematic
 
 ```
-   STM32F4-Discovery                         Rotary encoder (EC11, 7-leg)
+   STM32F4-Discovery                      Rotary encoder (EC11, 7-leg)
    ┌──────────────┐
-   │           3V ●───────────┬───────────┬──────────────┐
+   │           3V ●───────────┬────────────┬──────────────┐
    │              │           │            │              │
    │              │          ┌┴┐          ┌┴┐             │
-   │              │     10k  │ │     10k  │ │             │   (pull-ups
+   │              │      10k │ │      10k │ │             │   (pull-ups
    │              │          └┬┘          └┬┘             │    to 3V)
    │              │           │            │              │
-   │ PE9  (CH1) ●─┼───────────┼────────────●  A (CLK)     │
+   │   PE9  (CH1) ●───────────┼────────────●  A (CLK)     │
    │              │           │            │              │
-   │              │      100n═╪═      100n═╪═             │
+   │              │     100n ═╪═     100n ═╪═             │
    │              │           │            │              │
-   │ PE11 (CH2) ●─┼───────────●────────────┼──● B (DT)    │
-   │              │                        │              │
+   │   PE11 (CH2) ●───────────●────────────┼──●  B (DT)   │
+   │              │                                       │
    │              │                        ●  C (common)──┼──┐
    │              │                                       │  │
-   │              │                  SW1 ●────────────────┘  │
-   │          PA0 ●───────────────────┐  │   (push-switch)   │
-   │              │                    │  ●  SW2 ─────────────┼──┐
-   │          GND ●──────┬─────────────┼─────────────────────┘  │
-   │              │      │             │   mount legs ●●─────────┘
-   └──────────────┘      │             │              (to GND, shield)
-                         │             │
-                  ┌──────┴──────┐      │  B1 (on-board) also sits
-                  │ both 100n   │      │  3V ↔ PA0 — encoder SW is
-                  │ caps → GND  │      └─ in PARALLEL with it.
-                  └─────────────┘
+   │              │                              SW1 ●────┘  │
+   │         PA0  ●──────────────────────────────────● SW2   │  (push-switch, ‖ B1)
+   │         GND  ●──────┬───────────────────────────────────┘
+   │              │      │  mount legs ●● → GND (shield)
+   └──────────────┘      │
+                         │       B1 (on-board) also sits 3V ↔ PA0 —
+                   ┌─────┴──────┐  the encoder push-switch is in
+                   │ both 100n  │  PARALLEL with it.
+                   │ caps → GND │
+                   └────────────┘
 ```
 
 ---
@@ -63,20 +62,26 @@ Target board: **STM32F4-Discovery (STM32F411VE)**. Firmware: `src/main.rs`
 ## 3. Breadboard view
 
 ```
-        3V rail  ●━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━●  ← jumper from Discovery 3V
-        GND rail ●━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━●  ← jumper from Discovery GND
-        ┌──────────────────────────────────────────────────┐
-        │  [10k]   [10k]          encoder straddles trench   │
-        │   │ │     │ │         ┌──────────────────────┐    │
-   3V ──┴─┘ └──┬──┘ └──┬──────┤ A    C    B │ SW1  SW2 ├─┐  │
-        │      │       │       └──┼────┼────┼───┼────┼──┘ │  │
-        │   [100n]  [100n]        │   GND   │  3V   PA0   │  │
-        │     │       │           │         │             │  │
-   GND ─┴─────┴───────┴───────────┘         │             │  │
-        │                                   │             │  │
-        │   A → PE9      B → PE11      SW2 → PA0          │  │
-        └──────────────────────────────────────────────────┘
-            (jumper)     (jumper)      (jumper, ‖ B1)
+        RC filter — repeat for each channel (A, B):
+  3V  rail      ●━━━┯━━━━━━━━━━━┯━━━━●  ← from Discovery 3V
+                    │           │
+                  [10k]       [10k]
+  A node            ┼───→ PE9   │
+  B node            │           ┼───→ PE11
+                 [100n]      [100n]
+                    │           │
+  GND rail      ●━━━┷━━━━━━━━━━━┷━━━━●  ← from Discovery GND
+
+
+        EC11 encoder — straddles the centre trench (┊):
+        ┌─────────────────────────────┐
+        │  A    C    B   ┊  SW1   SW2 │
+        └──┬────┬────┬───────┬─────┬──┘
+           │    │    │       │     └───────→ PA0      (SW2  ‖ on-board B1 button)
+           │    │    │       └─────────────→ 3V rail  (SW1)
+           │    │    └─────────────────────→ B node   (DT,  channel B → PE11)
+           │    └──────────────────────────→ GND rail (C = common)
+           └───────────────────────────────→ A node   (CLK, channel A → PE9)
 ```
 
 Power both breadboard rails from the Discovery's **3V** and **GND** pins; tap
diff --git a/src/main.rs b/src/main.rs
index e520b85..b69d611 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -260,6 +260,11 @@ impl SetpointKnob {
         }
     }
 
+    /// Raw TIM1 counter, for debugging (does the timer see the encoder at all?).
+    fn raw_count(&self) -> u16 {
+        self.encoder.count()
+    }
+
     /// Sample the encoder, fold any rotation into the setpoint, and return it.
     fn poll(&mut self) -> f32 {
         let now = self.encoder.count();
@@ -267,11 +272,26 @@ impl SetpointKnob {
         let delta = now.wrapping_sub(self.last_count) as i16;
         self.last_count = now;
         self.accum += delta;
+        // Any movement at all means TIM1 is wired and counting. No "knob:" lines
+        // while turning => the timer isn't seeing edges (pull-ups / pins / init).
+        if delta != 0 {
+            defmt::debug!(
+                "knob: count={=u16} delta={=i16} accum={=i16}",
+                now,
+                delta,
+                self.accum
+            );
+        }
         let detents = self.accum / COUNTS_PER_DETENT;
         if detents != 0 {
             self.accum -= detents * COUNTS_PER_DETENT; // keep the remainder
             self.setpoint_c = (self.setpoint_c + detents as f32 * SETPOINT_STEP_C)
                 .clamp(SETPOINT_MIN_C, SETPOINT_MAX_C);
+            defmt::debug!(
+                "knob: {=i16} detent(s) -> setpoint {=f32} C",
+                detents,
+                self.setpoint_c
+            );
         }
         self.setpoint_c
     }
@@ -346,11 +366,12 @@ fn main() -> ! {
         // temperature to one decimal by hand via deci-degrees.
         let t_dc = libm::roundf(temp_c * 10.0) as i32; // tenths of a degree C
         defmt::info!(
-            "T={=i32}.{=u32} C  set={} C  {}",
+            "T={=i32}.{=u32} C  set={} C  {}  qei={=u16}",
             t_dc / 10,
             (t_dc % 10).unsigned_abs(),
             kettle.setpoint(),
-            kettle.state()
+            kettle.state(),
+            knob.raw_count()
         );
 
         // ---- wait one tick, polling the on-switch + encoder ----