Need suggestion to use a controller.

Thread Starter

fsoudbakhsh

Joined Jun 14, 2018
7
Hello,
I need to design a board that does the following:
1. Charging two 18650 type 3.7V batteries in series.
2. Shows the charging status with four LED indicators.
3. Fan speed controller (PWM).

I would be appreciated it if you can suggest a ready-made board that can do the above function, or suggests a controller IC that I can use in my circuit.
The size of the board should be small like ESP8266 Arduino.

Thanks,
 

LowQCab

Joined Nov 6, 2012
552
1) What do you intend to use for a Power-Supply ?

2) Does the Power-Supply need to be built-on-to the Board ?

3) Will the Batteries be mounted to the Board, or plugged-in ?

4) Will the Power-Supply be required to power the normal Battery-Load, and
charge the Batteries at the same time ?

5) How much Current does your Battery-Charger need to provide ?

6) Do you are about balancing the two Cells ?

7) How much Current does your Fan require ?

8) Do the Batteries power the Fan ?

9) Do the Batteries power the Fan with no External-Power applied ?

10) What controls the speed of the Fan ?

11) Why are 4-LED Charge Indicators required ?
Why not a single LED-flash-rate-indicator ?

12) Do the Batteries power the Charge-Indicator with no External-Power applied ?

13) How long are the Batteries expected to last ?

14) Do you care about Low-Battery-Voltage-Protection-Circuitry ?

15) Will you need a Sequenced-Shut-Down-Output
in the case of a Low-Battery-Shut-Down ?

16) Do You need any other Low-Battery warning outputs or devices ?

17) An ESP8266-Arduino is not particularly "small",
why are you using this Board as a size reference ?

18) Do You require a Micro-Controller to provide these functions for some reason,
or is a simple Analog-Control-System OK ?
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