I thought I had a simple circuit ready but I need help finishing it off. I’m using an IR receiver, transistor and a matrix of four 3MM LEDs. Want the LEDs to turn ON only when IR is detected.
Using a VS1838B IR Receiver, BC548 NPN Transistor and the 3mm LEDs powered by a 5V power bus. There are matching IR sources, as well, that are not a direct part of this circuit. The set-up is part of a large scale art installation where each circuit and LEDs will be on PCB “leaves” within a grove of “trees” (lots and lots of these little leaf set-ups). The individual “leaves” light up as someone gets near, triggering the IR receiver, off otherwise.
The main question: Though Ive seen this simple current source transistor circuit everywhere, I’ve not understood exactly how I can wire up the IR receiver to the transistor (especially because the receiver is a LOW when reading IR), and thus turn on/off the LEDs. Maybe wrong connections? Wrong Transistor? More resistance, Vcc?
VS1838 IR Receiver datasheet https://www.optimusdigital.ro/index.php?controller=attachment&id_attachment=4
3mm LED similar datasheet http://www.ea1uro.com/ea3gzl/Data%20sheets/Diodo%20Led.pdf