Need help with battery monitoring(LCD 16x2)

Projects General Guidance
1

Hi

I'm trying to make a battery monitoring. I had soldered a voltage regulator on a PCB for 5V for my arduino uno, components: 7805 and two capacitors of 10uF.
So here comes the question, can I connect my vOut to analog pin or must I add some components on my PCB?

Thank you in advance

Bizonpl18

2

bizonpl18:
Hi

I'm trying to make a battery monitoring. I had soldered a voltage regulator on a PCB for 5V for my arduino uno, components: 7805 and two capacitors of 10uF.
So here comes the question, can I connect my vOut to analog pin or must I add some components on my PCB?

Which battery are you wishing to monitor? Not the one that's powering the battery monitoring circuit I hope. If you're comparing volteges, one of your volteges must be known so as to use as a reference. You also need to be sure that the battery being monitored is under load. Accurate battery monitoring would require familiarising the circuit with a particular battery.

You could post a schematic, this would help.

3

So I can not use the same battery for my lcd as for the rest if I understand correctly?

I has two continuous rotation servo's, 5 line tracking sensors, an ultrasonic sensor and a push button attached to my arduino. Can you recommend me a good type battery?

Greatz

Bizonpl18

4

I wonder is there some language confusion?

In your Subject and in your first post you use the phrase "battery monitoring" which sounds like you want to measure and record the performance of a battery.

However I wonder if you really mean that you want to make a battery powered monitor to show some data which has nothing to do with batteries?

...R

5

I want to show on my LCD how long my battery still can keep up and what the voltage is of they.

6

Can anyone help? Grtz

7

If you're using primary cells, you can monitor the voltage level using an op amp. Set op amp to latch positive when battery is good. As voltage of cell falls below a given threshold, opamp output level starts to drop. Put output of op amp into adc input on arduino. Program what you'd like ic to do with regard to LCD display.

For nicads, this wont work as there is no gradual voltage drop during discharge. You'd need a way of clocking coulomb reading and match to capacity of cell.