@▷ Monitor Pin Detector | Diagram for Schematic

Monitor Pin Detector

To monitor the pins of the chip without any load I put on two 74HC245 integrated that drive the LEDs. In this way I view the states of the inputs and outputs with no load or resistance with LED, which is useful if you use the analog inputs. This circuit is not strictly necessary but it allows me to avoid check the status of the pins with the ‘scope, all works’ more than comfortable
pin detector Monitor Pin Detector