AC Auto

Main menu key: n

Uses a Mijia BLE temperature/humidity sensor to auto-send IR power-on / power-off for an air conditioner. Settings live in the ac_auto object in config.json, editable in on-device Options or Config Web (/ac-auto).

Screenshots

Prerequisites

1. Add the HT sensor in Config Web → Devices (model contains sensor_ht / .ht.) with a valid ble.key.
2. Aim the IR emitter at the AC receiver; brands match Infrared AC protocols (try another brand if no response).
3. Configure ac_auto: sensor, on_temp / off_temp, filter, and AC brand / mode / temp / fan.

Shortcuts

Key	Action
t	Start / stop AUTO
c	Display ↔ on-device config
s / BtnA	Blank screen; any key or BtnA wakes
r	Reset on / off streak counters
p	Toggle assumed AC on / off (icon only, no IR)
h	Help (3 pages: keys / params / how it runs)
, . [ ]	Flip Help pages
Config ; .	Move row
Config - =	Change value

Back to menu: on the display page, ESC / GO. On the config page, ESC / GO closes config first; press again to leave the app.

How it runs

On enter, the app listens to BLE on a duty cycle (whether AUTO is on or not) and updates temperature / humidity plus a ~12-hour chart whenever a reading arrives.

The app does not sense the real AC power state; on enter it assumes off. If the AC is already on, press p to mark the power icon ON so a later cold reading can send IR off.

IR is sent only after you press t and AUTO is active:

Condition	Action
Temp > on_temp for filter consecutive readings, AC considered off	IR power on (configured mode / temp / fan)
Temp < off_temp for filter consecutive readings, AC considered on	IR power off
Temp between off_temp and on_temp	Clear on / off streaks (hysteresis)

Example defaults: on_temp=29, off_temp=26, filter=3 → open only after three readings above 29°C; close only after three below 26°C.

BLE duty cycle

Many HT meters advertise every few minutes. In-app:

• Listen up to about 6 minutes per round
• After a valid reading, nap about 4 minutes
• Briefly keep listening after the first packet so filter can accumulate

Display

• Top: AUTO state, battery, BLE listen indicator
• Left: temp / humidity; right: on / off counts and AC power icon
• Chart: temperature trace with on / off threshold lines

Config fields (ac_auto)

Field	Meaning	Typical range
sensor_id	HT device id	Must match devices[]
on_temp	Open AC when above (°C)	16–40, default 29
off_temp	Close AC when below (°C)	10–35, default 26
filter	Consecutive hits before action	1–10, default 3
ac_brand	IR AC brand	midea / gree / …
ac_mode	Power-on mode	cool / heat / dry / fan / auto
ac_temp	Setpoint (°C)	16–30
ac_fan	Fan speed	auto / min / low / med / high / max

The Config Web /ac-auto page repeats this mechanism text under the settings form.