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Document planned battery (low) and Bluetooth (Matter joined) icon behavior

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temphummon dev 2026-09-24 17:58:09 +00:00
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PROJECT_MEMORY.md
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@ -117,6 +117,17 @@ All compositions verified live on the panel. (The earlier "no icon found"
conclusion was wrong - the icons were in f[13] bits 3/4, which the first conclusion was wrong - the icons were in f[13] bits 3/4, which the first
probe had not isolated.) probe had not isolated.)
### Planned status-icon behavior (for future battery + Matter work)
- **Battery icon** (`f[13]` bit4, 0x10): to turn ON when the device battery
is **nearly empty** (low-battery warning). Requires adding a battery/gas-
gauge circuit (e.g. ADC divider on VBAT, or an I²C fuel gauge) later.
- **Bluetooth icon** (`f[13]` bit3, 0x08): to turn ON when the **Matter/
Thread network join/connection is successful**, OFF when not connected.
Requires the Matter cluster + OpenThread bring-up (see TODO).
- Both compose with °C via OR: `f[13] = ICON_DEGC | (low_bat ? ICON_BAT : 0) |
(matter_ok ? ICON_BT : 0)` once those signals exist.
### Verified glyph segment map (from probing) ### Verified glyph segment map (from probing)
For a digit byte-pair, the **first byte** = left column + horizontal bars, the For a digit byte-pair, the **first byte** = left column + horizontal bars, the
@ -285,7 +296,8 @@ nix run .#flash
- [x] **Find decimal point & % bits** — probing session mapped them: `f[4]/f[8]` bit5 = decimals, `f[10]` bit5 = % - [x] **Find decimal point & % bits** — probing session mapped them: `f[4]/f[8]` bit5 = decimals, `f[10]` bit5 = %
- [x] **Find Bluetooth & battery icons** — `f[13]` bit3 = Bluetooth, bit4 = battery; combos with °C work (0x0D/0x15/0x1D) - [x] **Find Bluetooth & battery icons** — `f[13]` bit3 = Bluetooth, bit4 = battery; combos with °C work (0x0D/0x15/0x1D)
- [ ] **Add humidity sensor** — wire up an external I²C sensor (SHT40, BME280, etc.) and show on display line 2 - [ ] **Add humidity sensor** — wire up an external I²C sensor (SHT40, BME280, etc.) and show on display line 2
- [ ] **Configure Matter/Thread** — enable OpenThread / Matter components in `sdkconfig` - [ ] **Add battery + low-battery icon** — battery circuit/gauge; drive `f[13]` bit4 (battery icon) when nearly empty
- [ ] **Configure Matter/Thread** — enable OpenThread / Matter components in `sdkconfig`; drive `f[13]` bit3 (Bluetooth icon) on successful join
- [ ] **Implement Matter cluster** — temperature and humidity measurement clusters - [ ] **Implement Matter cluster** — temperature and humidity measurement clusters
- [ ] **Implement low-power operation** — deep sleep between measurements - [ ] **Implement low-power operation** — deep sleep between measurements