Arduino USB HID UPS

[kOld]

Just discovered your project, great documentation 👍

Right away I remembered the HIDPowerDevice for Arduino Leonardo: https://github.com/abratchik/HIDPowerDevice

This way should be possible to use all the common tools that will shutdown the system when the charge state gets low, also it will gets a nice battery icon for the compatible OSes

I’m planning on buying a unit and trying to merge your code with the HID UPS example for state and percent reporting, but probably we won’t get any insights about remaining time without analyzing the power consumption in realtime with some current sensor

Thanks, Élio

[FieserKiller]

Wow didn't know this existed! Share your progress pls, I'm curious if it'll work out fine. You could roughly estimate remaining time by measuring the time between 2 LED state changes and interpolating to zero.That would be really rough but better then nothing I guess :)

[kOld]

Definitely is better to have some estimate that nothing, I was thinking in using something like the INA226 sensor, should be pretty simple to setup up inline with the load.

There is a couple of interesting features that we can implement with a simple voltage and current sensor:

#define HID_PD_IPRODUCT              0x01 // FEATURE ONLY
#define HID_PD_SERIAL                0x02 // FEATURE ONLY
#define HID_PD_MANUFACTURER          0x03 // FEATURE ONLY
#define IDEVICECHEMISTRY             0x04
#define IOEMVENDOR                   0x05

#define HID_PD_RECHARGEABLE          0x06 // FEATURE ONLY
#define HID_PD_PRESENTSTATUS         0x07 // INPUT OR FEATURE(required by Windows)
#define HID_PD_REMAINTIMELIMIT       0x08
#define HID_PD_MANUFACTUREDATE       0x09
#define HID_PD_CONFIGVOLTAGE         0x0A // 10 FEATURE ONLY
#define HID_PD_VOLTAGE               0x0B // 11 INPUT (NA) OR FEATURE(implemented)
#define HID_PD_REMAININGCAPACITY     0x0C // 12 INPUT OR FEATURE(required by Windows)
#define HID_PD_RUNTIMETOEMPTY        0x0D 
#define HID_PD_FULLCHRGECAPACITY     0x0E // 14 INPUT OR FEATURE. Last Full Charge Capacity 
#define HID_PD_WARNCAPACITYLIMIT     0x0F
#define HID_PD_CPCTYGRANULARITY1     0x10
#define HID_PD_REMNCAPACITYLIMIT     0x11
#define HID_PD_DELAYBE4SHUTDOWN      0x12 // 18 FEATURE ONLY
#define HID_PD_DELAYBE4REBOOT        0x13
#define HID_PD_AUDIBLEALARMCTRL      0x14 // 20 FEATURE ONLY 
#define HID_PD_CURRENT               0x15 // 21 FEATURE ONLY
#define HID_PD_CAPACITYMODE          0x16
#define HID_PD_DESIGNCAPACITY        0x17
#define HID_PD_CPCTYGRANULARITY2     0x18
#define HID_PD_AVERAGETIME2FULL      0x1A
#define HID_PD_AVERAGECURRENT        0x1B
#define HID_PD_AVERAGETIME2EMPTY     0x1C

#define HID_PD_IDEVICECHEMISTRY      0x1F // Feature
#define HID_PD_IOEMINFORMATION       0x20 // Feature

// PresenStatus dynamic flags
#define PRESENTSTATUS_CHARGING       0x00
#define PRESENTSTATUS_DISCHARGING    0x01
#define PRESENTSTATUS_ACPRESENT      0x02
#define PRESENTSTATUS_BATTPRESENT    0x03
#define PRESENTSTATUS_BELOWRCL       0x04
#define PRESENTSTATUS_RTLEXPIRED     0x05
#define PRESENTSTATUS_NEEDREPLACE    0x06
#define PRESENTSTATUS_VOLTAGENR      0x07
#define PRESENTSTATUS_FULLCHARGE     0x08
#define PRESENTSTATUS_FULLDISCHARGE  0x09
#define PRESENTSTATUS_SHUTDOWNREQ    0x0A
#define PRESENTSTATUS_SHUTDOWNIMNT   0x0B
#define PRESENTSTATUS_COMMLOST       0x0C
#define PRESENTSTATUS_OVERLOAD       0x0D

Anyway, I was looking into your pictures and I'm wondering if we have an UART interface available right here:

Did you try to use some logic analyser with this pins?

[kOld]

Just a quick update, I've tested the library on a Arduino Pro Micro 16Mhz and it works brilliantly, at least under Mac OS X:

Edit: I've created very quick version of your code with the UPS HID library: https://gist.github.com/kOld/5d2c7f3ae3c810de0f3b00ebc06c6180

Not sure if it's working perfecty but give it a try in case you have an Arduino Pro Micro or Leonardo laying around