- Sat May 13, 2017 6:54 am
#194848
In recently bought this lipo fuel gauge: https://www.sparkfun.com/products/10617
I connected the SDA and SCL pins to my microcontroller (ESP8266) and connected VCC and GND to the microcontroller too.
I then connected the battery, while not yet powering up the microcontroller. To my surprise, the lights on the ESP8266 started flashing. It tuned out that the VCC and GND pins of the lipo fuel gauge actually output the battery voltage, which I did not expect and which I do not want (the ESP8266 required 3.3v, while the lipo can provide 4v when fully charged). When I disconnected the VCC and GND and just left the SCL and SDA lines connected, it seems to work fine.
Is this normal behavior, or do I have a faulty unit?
Regards,
Erikj
I connected the SDA and SCL pins to my microcontroller (ESP8266) and connected VCC and GND to the microcontroller too.
I then connected the battery, while not yet powering up the microcontroller. To my surprise, the lights on the ESP8266 started flashing. It tuned out that the VCC and GND pins of the lipo fuel gauge actually output the battery voltage, which I did not expect and which I do not want (the ESP8266 required 3.3v, while the lipo can provide 4v when fully charged). When I disconnected the VCC and GND and just left the SCL and SDA lines connected, it seems to work fine.
Is this normal behavior, or do I have a faulty unit?
Regards,
Erikj