Gucioo
commented
9 months ago I verified pinouts for V15 and enabled Serial Debug as David mentioned in other topic
RESET PA31 SWDIO PA30 SWCLK PA00 PA11 - Rx Sercom0 > PA10 - Tx Sercom0 GND Vdd (3.3v)
So PA10 and PA11 can be connected to a USB-serial converter or similar at 115200baud and you can see the debug output.
By setting temp limits to - 300 & -400 battery pack is charging and giving output when trigger is pressed.
#define MIN_PACK_CHARGE_TEMP -300 //'C - if less than this, no charge.
#define MIN_PACK_DISCHARGE_TEMP -400 //'C - if less than this, no dischargeThis is output from debug serial: _Dyson V10 BMS Aftermarket firmware init (C) David Pye davidmpye@gmail.com GNU GPL v3.0 or later Pack cell voltages: Cell 0: 3659 mV, min 2500 mV, max 4200 mV Cell 1: 3686 mV, min 2500 mV, max 4200 mV Cell 2: 3667 mV, min 2500 mV, max 4200 mV Cell 3: 3651 mV, min 2500 mV, max 4200 mV Cell 4: 3745 mV, min 2500 mV, max 4200 mV Cell 5: 3749 mV, min 2500 mV, max 4200 mV Cell 6: 3742 mV, min 2500 mV, max 4200 mV bms_mainloop: Entering state BMS_IDLE bms_mainloop: Entering state BMS_DISCHARGING bms_mainloop: Entering state BMS_FAULT Starting discharge Discharging at 0 mA, 1000 mAH, capacity 2000 mAH, Temp -56'C Discharging at 8 mA, 1000 mAH, capacity 2000 mAH, Temp -56'C bms_mainloop: Entering state BMSIDLE
I will have to check temperature reading equation, initially looks fine, you are reading TS2_HI register. I measured around 0.876 V on RT1 & RT2 in ambient temp 22.5 deg C. For bq76930 maybe reading TS1 and TS2 would be also nice.
int bq7693_read_temperature() {
//Returns 'C * 10 eg 217 = 21.7'C
volatile uint8_t scratch[3];
volatile int adcVal = 0;
volatile unsigned long rts;
volatile int vtsx;
volatile float tmp;
bq7693_read_register(TS2_HI_BYTE, 3, scratch);
adcVal = ((scratch[0]&0x3F)<<8);
adcVal |= scratch[2]; //ignore the unwanted CRC byte.
// calculate R_thermistor according to bq769x0 datasheet
vtsx = adcVal * 0.382; // mV
rts = 10000.0 * vtsx / (3300.0 - vtsx); // Ohm
// Temperature calculation using Beta equation
// - According to bq769x0 datasheet, only 10k thermistors should be used
// - 25°C reference temperature for Beta equation assumed
tmp = 1.0/(1.0/(273.15+25) + 1.0/3435 *log(rts/10000.0)); // K
volatile int result = (tmp - 273.15)* 10;
return result;
}
davidmpye
Suenbrad
WolfDawid
rulof86
aasmundleirhaug
My battery from Dyson V15 detect (SV22) stopped working suddenly, even it had 14 minutes left on LCD.
It didn't give any power and did not light any LED. I opened it and measured the cells voltage and there were 4x 3.1 V and 3x 3.5 V, this is probably the case where they go out of balance and uC locks battery output. I charged remaining 4 cells to 3.5 V, so now all cells are at the same level - 3.5 V. This didn't recover battery pack. Connecting charger doesn't trigger LED or V out either.
I found your firmware and topic on the forum, which is very helpfull. Dyson is clearly putting bad practice in to BMS batteries. Forcing to buy new battery, even though old one is usable. I can us old one for tests or provide some details / images to help.
Looking at wiki under section V11, I decided to give it a go and flash the firmware using Rpi4.
I compiled new firmware with following change to the config.h, as per your advice:
define ENABLE_CHARGE_PIN PIN_PA01 // V10 PIN_PA02
Now battery BMS seems to be giving some signs of life. Still no output on the main Pins. but there are 2 flashes of blue LED, it only has 2 blue LEDs and you already know it :) looking at your wiki error list:
This would lead to incorrect/missing mapping of RTDs?
There are 2 RTDs and I measured their resistance: 38 Ohms and 39 Ohms.
I can remove glue from PCB and maybe trace back RTD pins, if that will help bring compatibility with V11&V15.
Kudos to you David. It would be fantastic if these old batteries could work again with our vacuums. I know there is still serial protocol that have to be figured out, but you did already great work.