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lpollier / battmon

Battery monitor for Aibo
MIT License
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No device found on scanning SMBus #6

Closed kgh02017 closed 1 year ago

kgh02017 commented 1 year ago

I couldn't read my battery info (ERA-201B1). The reason seems that BattMon cannot detect SMBus device.

I tried to connect other I2C device (LCD1602, address=0x279 ) and scan SMbus. This time BattMon could find the device, so its sketch works well, I think.

Could you please give me an advice to solve the problem ?

lpollier commented 1 year ago

Hi kgh02017,

OK, from what I understood of your context, the bq2040 gas gauge is not responding since it is probably not well powered.

So, I deduce from my assumption that your ERA-201B1 battery pack is close to dead, meaning its cells are not able to power at least the gas gauge alone.

Can you try to full recharge your battery pack before testing it with the BattMon 2.0 toolkit?

And also you should power the Arduino Uno from the USB external source of power, and if possible not connecting the switch and not connecting the red wire (Pack+) from the wiring diagram: https://github.com/lpollier/battmon/blob/master/example/ERA-201B1_wiring_diagram.png

kgh02017 commented 1 year ago

Thanks.

So, I deduce from my assumption that your ERA-201B1 battery pack is close to dead, meaning its cells are not able to power at least the gas gauge alone. Can you try to full recharge your battery pack before testing it with the BattMon 2.0 toolkit?

I tried to check with full recharged ERA-201B1 battery (AIBO works 1.5H with this), but no luck. Now I suspect bad connection with battery. The voltage between pin1 and pin6 was almost 0V. Is this correct state ?

lpollier commented 1 year ago

OK, so the battery is working well when inserted in the AIBO.

To measure a voltage between Pin 1 (Pack+) and Pin 6 (Pack-), you need to short Pin 4 (/EN) and Pin 6 permanently, ideally with a switch.

But you should also be able to communicate with the bq2040 with only using Pin 2 (SMBus Clock), Pin 3 (SMBus Data) and Pin 6 (Pack-). The gas gauge is powered internally by the cells. And the Arduino Uno by the USB cable.

kgh02017 commented 1 year ago

To measure a voltage between Pin 1 (Pack+) and Pin 6 (Pack-), you need to short Pin 4 (/EN) and Pin 6 permanently, ideally with a switch.

Is the following right ? The voltage between red and black is almost 0V (about 200mV).

IMG_4195

lpollier commented 1 year ago

Yes, it should works, you should have the output voltage of about 6.0V-8.4V like this: ERA-201B1_switched

lpollier commented 1 year ago

So it seem that is one or more pins that are not well connected. You can find more details with the schematic: https://github.com/lpollier/battmon/blob/master/example/ERA-201B1_reverse_engineering_schematic.pdf

kgh02017 commented 1 year ago

Thanks.

When I move the connector to battery slowly, I found that tester sometimes show 8.14V (between 1p-6p voltage) What type of connector is good for battery connection ? I use 6pin jumper connector, but this seems to be not good.

lpollier commented 1 year ago

Ok, you should try with these 6 pins connectors: https://a.aliexpress.com/_EGcXjy5

Pitch is 2.5mm and pin thicknesses seems to be 0.6mm.

kgh02017 commented 1 year ago

Thanks. I've ordered that. When I get it, I'll try with it.

lpollier commented 1 year ago

Great. I'm going to close this issue. Let me know if you need help.

Loic