Megan40 - Picaxe 08 Firefly
This is robotic Firefly based on a picaxe 08 using UltraViolet leds as sensors.
Here you can see her Big Flattering Stereo eyes, they are simply UltraViolet LEDs - the red leds on top are feedback indicators.
The UV leds are connected to a LM324 opamp that amplifies and also conditions the logic and trip levels going into the picaxe.
I can highly recommend the use of Ultra Violet leds as detectors as they are not affected by ambient /infrared and laser light.
Her rear is composed of a Spiraled Glow PolyMorph tube - it is illuminated by two UV leds.
Flashing good time was had by all......
The little 8 pin chip is its tiny picaxe 08 brain....... inclusive 128 byte memory.
Flashing routines and UV tracking routines fitted noproblemo (the faster you write your code the more you can fit in).
Here you can see her 40MΩ (in total) opamp feedback resistors - although 230MΩ was recommended (yikkeess Air-Gap has less).
Megan40 is attached to the top of a glass jar via a spring to a servo, this gives her life and enables her to track & follow my UV pen light or UV laser. She is sitting on my window-sill enjoying the sun - but eagerly awaits a tickling from my UV probe.......
Yes she is green powered by 2 solarcells float - trickle charging 4 AA recharge batteries
What is Megan40s future :-
I plan to use her eyes as an input program select , ie on "start up" by shining the UV into here right eye...she will go into tracking mode. Or if left eye is chosen then she will go into autonomous mode and act like a firefly attracting real fireflies intomy garden.
NB. UVA-UVB-UVC are all to be treated with care. High level/Overexposure is hazardous to health.
Or if two eyes are chosen ............ who knows..... what would you expect her to do .....?