Questions regarding battery shield
Greetings. I am totally new to using batteries in projects and have a few questions I can’t find the answer to. Maybe some of the experienced Wemos users have the answers.
- Is the battery shield for lipo or li-ion (18650)? Have read that it’s important to choose the correct charger for Li batteries but can’t find if the shield is for LIPO or LI-ion on the wemos site.
- How to use the J2. Isn’t the J2 a direct connection to A0? I attached an 18650 with 3.9V to a shield without a Wemos attached and measured 3.9V with my multimeter. The wemos A0 is 3.2V max and Wemos are 3.3V, so how am it supposed to be used?
And a request to @Wemos: Shouldn't the battery connection be on the opposite side to the USB? Would make it easier to put it into a enclosure since the shield and thus the usb can be placed closer to the wall that way.
- yes, this shield use Li-Ion / Li-Po battery (3.6v/3.7v)
- Wemos D1 mini module have internal voltage divider on A0 input.
beware! use battery with protection, this battery shield is very unstable.
Thanks! Still confused by the a0 though. Isn't the voltage divider in the wemos from approx 1v of the 8266 to 3.2v? Or do you mean there is also a voltage divider in the shield that takes it even further so that a fully charged 3.7V won't burn the wemos?
i not have this version with J2, but i see it on picture. J2 connected to small resistor below inductance 4R7
this resistor and internal divider must give correct voltage.
Ok. That probably also explains why I was getting to high voltage when I tested without a wemos attached.
Thanks a lot for the answers.