Arduino Project Power Supply

Help & Support Robot Parts
1

Hello guys

I’m thinking of a system for my car (like an alarm but it will be able for two ways communication with the car and the phone) it will be based on an atmega2560-16au along with a GSM shield and GPS)

I figure everything out but am stuck with the power system> I don’t want to dedicate connect it to the car’s wiring because if I leave it for a day or so probably will drain my battery. I want to make something “hybrid” like using both my car’s wiring and a battery pack of 18650 with BMS (12v? probably).

The idea is like this.

    V

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when the car is turned on the system will turn off and the battery of the system will start to charge(if it is night or the car is not running by using the car’s battery).

when the car is turned off then the system will start and it will use a few 18650 batteries. (If am not mistaken I believe it will hold for a night till I start the car)

Power: I will use 12v to power both arduino and GSM shield as well as the relay board

Power Drawing: Around 1.6 amps at the start-up (most of it is being drawn from the GSM) and then around 1amp (all connected atmega2560, gsm( working all time), relay board, and few sensors(temp, hum)

Any ideas on how to do it?

Thanks in advance

Nikolaos Konstantinou

4

Hello @nicolascon96 and welcome to the RobotShop community,

First of all, you will need a voltage regulator because when the car is being used it can produce spikes that can affect the electronics and could damage the Arduino. Now, to create the “battery backup” when the car’s battery is off there are a couple of options, you could use the signal from the car’s computer, which goes to the fuel pump control relay as a control signal to activate a relay that allows the use of the backup battery when the car’s battery is not on, or even simpler, something like this:

image


Or even easier, use a charger that can be left on with your battery, that way the charger keeps the backup battery charged, and when the main battery goes off the backup battery takes over.

I hope this information can help you!

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