555 and accelration

[chui]

ok, here is the thing:
I have 555 circuit that outputs one or zero, alternativly, in a certain speed.
I need to connect something between two 555 s (or similar) so with time, one of the 555's frequency of outputting 1/0 would be changed.

example: one 555 (No1) outputs 1/0 every 1000 miliseconds. other 555 (No2) outputs 1/0 every 500 miliseconds. then what I want, is that every time that No1 outputs a "1" - the frequency of No2 will increase in one milisecond (501..502..503.. so on).

Hope i made myself clear. gracias.

 

[kchriste]

It will be impossible to get this kind of accuracy from a pair of 555s. It would be far easier to use a PIC or some kind of VCO chip (4046) in place of 555 (No2)...
Edit: Forget the VCO, it will do something like you want but with little accuracy. Use a PIC. You don't mention how long the increase in 555(No2)s is to continue for. It has to stop somewhere.

 

[chui]

Actually I want it to increase for about 1 hour..
PIC, ah? what it do? I'll check about it. thanks.

 

[Nigel Goodwin]

Actually I want it to increase for about 1 hour..
PIC, ah? what it do? I'll check about it. thanks.

A PIC is basically a computer on a single chip - you could use an 8 pin one (same size as a 555), and if you use a crystal oscillator with it you could get good long accurate delays. However, you do need to program the PIC to do what you want!.