Here is FireFly C10 detecting the UV glowing light off FireFly C224
C10 then synchronises and flashes in unison with C224
Yes i am using a simular circuit - what i did not know is that you can wind up the feedback resistor to 30MΩ
The circuit is pretty sensitive - one plus factor is that i am guaranteed dark or low level ambient light conditions (inherent for fireflies YAY).
Just to add they are not so prone to ambient light....
..... cream on the cake is ..... if you want more sensitivity you just add more.
(i have to make a pair of super fireflies now .........2 UV eyes and 1 UV emitter ......without polymorph though to get better range :-(