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How to connect Arduino and Raspberry Pi together with one SLA 6V 4A battery. Answered

I am planing to use step up dc to dc voltage regulator for both of them. Can i simply connect the regulators polar to SLA battery's + and - ?
At the same time, SLA battery is charged by solar power which controlled by arduino.


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iceng

2 years ago

Perhaps you do not want use up the battery as you are proposing.

The boost converter is only 80% efficient then the regulator on the Arduino wastes the 7v to 5v regulation (2v x current) as heat.

So, EE_student_you, are wasting battery energy in two ways that Steve and I

(who are both long time electrical engineers) tell you is a bad design...

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ozmosiceng

Answer 2 years ago

I have just got step down buck convertor, and outputs are fixed 5V for both mco. Their efficiency 90% and 95%.

Thank iceng i appreciate your advice.

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icengozmos

Answer 2 years ago

Good choice...

As an old EE I am skeptical of 90% eff, but this approach is so much better then the up /-\ down method...

Most uProcessors can run at o.5 volts above specified rating...

Some time a diode in series can give you a Quick reduction to 5.4 volts.

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steveastrouk

2 years ago

Step down surely ? The Pi and Arduino need 5V. You might be better with a linear LDO regulator, since you only have 1V or less difference between the supplies.

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ozmossteveastrouk

Answer 2 years ago

Thanks steveastrouk, i have read the Arduino datasheet and yes the operating voltage is 5V but recommend input voltage is 7-12. I could supply 5V power from the pin but i am going to use couple modules, so i think it is good stick with 7V at least.

My question is that can i connect two bucks in parallel directly with SLA battery.