hypnos
Module embedded inside users' laptop to "remind" them to take break and sleep
Background
I used to have a script that runs every couple hours to turn the computer off to remind me to take a break. However, that script can be easily bypassed and it's not cross-platform. Embedding hypnos into the motherboard of my laptop and enabling tamperproof protection in the BIOS for the case make it much harder to bypass.
Features
- Interact with device through phone app
- Allow users' actions to be asynchronous, save and transmit their actions when the device is connected
- Allow a limited number of exceptions through tokens per month: Allow users to select a time range that they don't want to be disturbed, the number of tokens needed are automatically calculated and applied
- Waving sleep time as well as applying many tokens in the same day should cost more to prevent binge
- Customizable work and break duration(there has to be an upper and lower limit though)
- Limit amount of total screen time per day
- Statistics for tracking progress
- Foreground task to show device status as well as current phase
- Synchronize with app to keep correct time, remind users to connect to device if they haven't for a long time
- Indicate the current time stretch
- Bed time and wake time
- Battery indicator
- Flexibly adapt to user' start of day
- Hard to abuse or bypass but also possible to remove when truly necessary
- Low power consumption
- User has pending actions like changing rest interval
- Need corrective actions such as clock syncing
- Reset switch for resetting all settings(including BLE bonding information)
- Small size: About 1.5 x 1.5 inch
Custom GATT
The custom service is called the Timetable Service. Base and other UUIDs are taken here:
// base is f364adc9-b000-4042-ba50-05ca45bf8abc
#define UUID_SERVICE 0x1400To store an hour:minute info, needs 11 bits(5 for hour, 6(least significant) for minute) for 24-hour format. All timing is stored that way except for the current time service.
All times are in GMT.
All would require authentication to read/write
| UUID | Type | Data Type | Range |
|---|---|---|---|
| 0x1401 | MORNING_CURFEW_END | time type | 24-hour format |
| 0x1402 | NIGHT_CURFEW_START | time type | 24-hour format |
| 0x1403 | WORK_DURATION_MINUTE | uint8 | 30-120 |
| 0x1404 | BREAK_DURATION_MINUTE | uint8 | 5-15 |
| 0x1405 | ACTIVE_EXCEPTIONS | list of pair unix time | 0-4 exceptions |
| 0x1406 | TOKENS_LEFT | uint8 | depend on policy implementation |
| 0x1407 | CURRENT_UNIX_TIME | uint32 | until saturation |
Max of 4 exceptions can be active at one time
References
BLE Chips Power Consumption Picking Advertising Interval
