Analog input with amplifier

Oh good to know, sorry if I don't got it early.

I need those sensors for know how much corrent is going through and then convert it to power, by this way I will display both consumption power and "photovoltaic" power into web and later into a mobile phone.

The other thing that I thinking about is, when a battery charge is low, so provide a extra power with a generator, so this fact must be automaticlly switch on and off when it's enough.

I know maybe it's too easy tu understand, but I am new at this, and your posts are very helpful.

Thank you.

@abe708

In your last description i see something like an energy meter you want to build, is it right ?

I think, you try following steps:
1. measure the voltage [V] and the current [I]
For this you get a usable result with the Logo
2. calculate the power P [W] = U x I
For this you also get a usable result with the Logo
3. calculate the energy E [kWh]
This will be difficult with the Logo, because you have to build an integral and the Logo only can calculate with 16 Bit integer values. Have you a plan for this, how to solve this point or do you not need the energy values ?

Regards, Scorp

@Scorp

I thought that calculate and display energy parameters [E] of consumption and generation was not so far from obtain power [P].

Totally yes, what I want to do is an energy-meter, these are my first steps. 

Would you recommend me, just display the power [P] ? And every day display the energy consumption and energy generation from the previous day ? Like, store all this values and then at a specific time rescue this values and calculate the energy, with this expression  [E = P * time].

Best whises.

@abe708

Attached is a very simple example to calculate the power, if you have the voltage and the current. For this you only need an arithmetic block.

As i have written the calculation of energy is difficult, not only for you, also for me. You have to add the power values e.g. every second to build an integral, but the Logo only use integer values from -32768 to +32767. I have no possible solution for it to get usable results. For this you normally need a PLC with more mathematical functions or a arduino or raspberry pi e.g.

Regards, Scorp

@Scorp

I have looked at your attached document, thank you !

So I mostly understood the function of everything, I only doubt when it is writes "Set P3 ... " Which blocks exactly do I need to change ?

Best wishes.

I have placed the comment directly next to P3 of B003. What du you think, which block i mean ? 

B001 and B002 are only the placeholders for your voltage and current, you can delete them, if you have blocks in your program with linkable outputs to your measuring results.

By the way, have you an incomplete Logo program with your previous trials to insert the next step ?

Regards, Scorp

P.S. For the next step i have found a solution in this forum, see Link