arduino_alkaline-battery_charger's Introduction

Arduino alkaline-battery charger

An arduino project for charging non-rechargable battery

Disclaimer, or, use at your own risk

Charging non-rechargable battery is dangereous and must be done knowing the risks

Only charge battery that meet this requirements:

Must an alkaline
Residual voltage > 1.20V
No damage or corrosion

Diagram

## Materials

This project require only components that are available on the Arduino Starter Kit.

1x Arduino Uno rev3
10x 220 Ohm resistor
1x Diode
1x Green LED
1x Red LED
1x TMP36 Temperature sensor
1x BC547 Transistor
1x Push button

How to use it

Steps:

Reproduce the circuit on your breadboard (put the TMP36 in contact with the battery. If not possible you have to check manually the battery temperature)
Paste the programm in the arduino IDE
Download the Timer1 library
Change the value of the constants if needed You are good to go.

Make sure to keep the battery well connected during the recharge process if you do not have a good mounting for the battery as it can leed to errors.

How it works

Current send to the battery

Non-rechargeable alkaline battery are rechargeable if the current is low enought and if they do not heat.

For that I am going to send a square periodic current throught the battery. The breaks allow the battery to cool down.

   <- 120 ms ->
5V ------------|  |------------|
               |  |            |
0V             |--|            |--
               <--> 5ms

Why use a transistor and not the output pin directly ?

Each digital pin of the arduino are capable of a maximum output of 40mA. That is not enought in our case.

TODO: Complete the explaination

Library

Arduino analogWrite() function don't allow to set the frequencies of the PWN. So to create a PWM with a frequency of 8Hz I use the Timer1 library.

References

TODO

Recommend Projects

zephvr / arduino_alkaline-battery_charger Goto Github PK