I am currently building a FRED Photopopper but instead of using flashing LED can I use normal LED? I don't get what is the difference between these two in the circuit. If the FLED cannot be replaced, is there any equivalent circuit for a FLED?

I am using arduino pro mini (which contains Atmega328p AU ) along with cc2541(HM-10) to process and transfer data over BLE to smartphone. I...
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