Hi Florin, Be careful, test the 555 pulse generator on a breadboard first. It can be very noisy (at least SN7400N quadruple 2-input NAND gate, used by me as train pulse generator, it was). If you have too many pulses as normal then you must use an "optocoupler" between (or maybe using an 12F675 as pulse generator with a potmeter on an adc input to increasing/decreasing frequency?).
Sebastien wrote: "Arduino shields are small, you don't have many space to play with, maybe that's why there are lots of double-sided designs ? " Yes that's true , this is why I'm building a Pinguino-like board (JAL powered, of course): for projects without board size limits :D . Vasi(funlw65) On May 10, 11:21 am, Florin Tanasa <[email protected]> wrote: > On Monday 10 May 2010 21:04:40 Sebastien Lelong wrote: > > > > > For measuring frequency (rpm windmill, wind speed) > > > > > Can you tell me more ? As a frequency divider ? Why not directly using > > > > a pin to count RPM ? > > > > I need to measure the frequency from generator and translate to rpm > > > (depends > > > to pol number) and another pin is to measure frequency from reed relay > > > connected with pull down resistor and translate to rpm, for wind speed > > > (anemometer). > > > With this variable I wish to calculate the TSR (tip speed rotation) > > > blade. How you think I can made this with only one pin? With > > > multiplexing? > > > No, I was just wondering how you'd use 555 (which I never used) and was > > thinking that "collecting" ticks and converting to frequency may be doable > > using a pin + timer ? > > With 555 I simulate the frequency from 10-120Hz. > With help from Vasi I measured with successfully using lib tmr0_isr (modified > > for 18f4550) and tmr0_poll from 1Hz, with division 1Hz, in simulator. > > > Cheers, > > Seb > > -- > Florin Tanasahttp://sites.google.com/site/florintanasa/ > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/jallib?hl=en. -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
