Comments on: 64 Synchronizing Fireflies

By: Inspirace pro vaše projekty | ?Art.cz

Inspirace pro vaše projekty | ?Art.cz — Fri, 07 Oct 2011 07:27:09 +0000

[...] projekt, který bych si rád vyzkoušel jsem našel na webu tinkerlog.com. Autor tam ukazuje sv?j kit, který se chová jako jistý druh sv?tlušky. Ty se umí bez jakékoliv viditelné komunikace synchronizovat v blikání, až nakonec blikají [...]

By: Alex

Alex — Tue, 06 Apr 2010 22:27:12 +0000

Choose a resistor that matches the “resistance” of the diode in the lighting conditions you want to use.
The voltage divider (resistor and diode) should divide the voltage in equal parts (optimum), e.g. 5V over the voltage divider, 2.5V over the resistor and 2.5V over the diode. That way you get the most range out of your sensor. Remember to do the measurement in the lighting condition you want to use (probably in the evening or at night).

By: Vlatko

Vlatko — Tue, 06 Apr 2010 06:56:44 +0000

Can you explain a bit more about adapting the resistor value. How should I calculate the correct value?

By: Alex

Alex — Thu, 01 Apr 2010 22:09:49 +0000

A photodiode should work as well. You may have to adapt the resistor in series with the diode to form a voltage divider.

By: Vlatko

Vlatko — Thu, 01 Apr 2010 07:48:34 +0000

Can someone tell me if it is possible to use a photodiode instead of phototransistor?
Thanx

By: Alex

Alex — Sat, 09 Jan 2010 01:15:31 +0000

That one is from rs-components.com (or rs-online.de here in Germany).

By: Eric

Eric — Fri, 08 Jan 2010 19:55:36 +0000

Thanks for the quick answer! Mouser doesn’t carry that supplier, nor do they have a suitable replacement in stock. However, it looks like I can pick up most of the stuff from Digikey, except the photo-transistor… minimum order of 4,000. Do you pick it up from a different distributor?

By: Alex

Alex — Fri, 08 Jan 2010 16:00:15 +0000

I’m now using this part S5438-ND from Digikey. Don’t know if Mouser has something like that.

By: Eric

Eric — Fri, 08 Jan 2010 15:52:43 +0000

What do you use for the breakaway power sockets? I’m having trouble finding a suitable part on Mouser (I have everything else set up in my cart, just can’t seem to find a good one for that…)

By: Matheus

Matheus — Fri, 02 Oct 2009 03:19:39 +0000

Simply Awesome! After setting up two fireflies, using the code available on the page, I realized that the flashes are a bit slow. Any tips?