Energy-Efficient Voltage Measurement with ESP8266 and Li-Po 18605 Pack

Welcome,

I am building a wireless sensor based on the esp8266. The circuit will be powered by a li-po 18605 pack.

The ADC in the esp measures voltages up to 1v - so I can use a voltage divider built with e.g. two resistors (e.g. 100R + 33R).

The problem is that I would like the whole circuit to be energy efficient - so the ESP itself is woken up for a few seconds every 10 min - it measures and transmits the results. And such a voltage divider would "eat" energy all the time.

Do you perhaps know of any better solutions that I could implement? Maybe some kind of transistor key?

I would like the voltage to be measured only when I want it to be, and no extra energy would be lost.

Hello.
Use larger resistors e.g. total resistance of 10-100k. You will calculate the current that will flow from Ohm's law. In general, the larger the resistors, the more susceptible the measuring system will be to noise - this can be reduced by software filtering.

Welcome,

The max voltage is 4.2V. I measured and it came out that such a divider takes ~50uA so with a pack capacity of ~3000mA this is a negligible value.

However, I have a question about charging the 18605 batteries. I am currently connecting two batteries in parallel and charging them using the tp4056 module. I understand that with such a system each piece must be similar in parameters.

The question is, can I charge 4 packs connected in parallel in this way?

czarny8322 wrote:

Question, can I charge 4ry packs connected in parallel like this?

.
Do you mean four batteries in parallel? You can combine with similar parameters. Of course, the charging time will increase proportionally because this tp4056 has a limited charging current of ~1A.

yes, in parallel:) <br /> .
many thanks for your reply.