ir sensor using arduino uno

litar.fzz (25.8 KB)

The second FC-51isn’t connected to power (although it looks to be in breadboard it isn’t in schematic.)

In schematic no connection

That is because you can’t connect to the middle of a wire in breadboard:

You need to connect either to a pin or a bend point in the wire. If you click on a connection like this

Fritzing will light yellow everything that is connected (as we see here, the black wire does not connect to ground!)