I'm trying to build a cuircuit that is to generator a certain frequency for half a second, then move to the next for half a second and so on. Basicly this would be trigged by a button.
I mabey be needing to design several hundred of theses circuit so I'm trying to look into a cost efficient way of building them.
My idea was to use a microcontroller, which from my understand would need a crystal to regulate and 2 diodes. Then I would need a battery to power everything and some sort of speaker for the frequency.
Is there a better cost/efficient way to design. I'm I thinking about the right materiels or I'm I missing something important for the curcuit to work?
To be more exact, my dad used to work on telephone line (had hi sown compagny) and told me if you use a device that would produce the dial tone frequencies up to the phone speaker, you could dial the number. I'm trying to make a device that can reproduce those frequency simply loud enough for the phone microphone to pick them up.
I mabey be needing to design several hundred of theses circuit so I'm trying to look into a cost efficient way of building them.
My idea was to use a microcontroller, which from my understand would need a crystal to regulate and 2 diodes. Then I would need a battery to power everything and some sort of speaker for the frequency.
Is there a better cost/efficient way to design. I'm I thinking about the right materiels or I'm I missing something important for the curcuit to work?
To be more exact, my dad used to work on telephone line (had hi sown compagny) and told me if you use a device that would produce the dial tone frequencies up to the phone speaker, you could dial the number. I'm trying to make a device that can reproduce those frequency simply loud enough for the phone microphone to pick them up.