How to select ideal components (temp+time+Radio+...)

[sirtom60]

@anon35827816

But let's go for something like a Mega or so as a starting point. Although you could get there with a mere old-style Nano if you had to.

@sirtom60

Is it absolutely necessary to include an amplifier for loudspeakers?

Yes.

Which amplifier unit would you choose?

@sirtom60

How to choose the right display?

By determining what you need to display on it and under which conditions you need to read/see it.

There are thousands, but display has no priority.
Which display would you choose?

@sirtom60

by battery as long as possible (ideally several years)?

Shall we start with a couple of months or so?

Nevertheless I might choose the "wrong" base components.

@sirtom60

Is range (maximum 10 m) a criterion?

Of course it is. You do realize you're looking at two microcontrollers (Arduinos) connecting remotely, are you?
Look for something like NRF24L01 modules, but there are a few ways of making this work. The NRF24xxx are popular though.

thx.

If I can make a suggestion: work in a modular fashion.

1. Create a system that plays pre-recorded sounds
2. Create a setup that measures temperature with the sensor of your choice
3. Create a setup where you have two arduino boards 'talking' to each other
   Then start integrating it all. PS: 3 will be a challenging one; most people struggle a lot with it.

That's the way I'm planning.
But I'ld like to decide the components first, expecially energy saving wireless sending outside unit, as other unit might need other setup/programming.