Written by: Newton C. Braga

This shield circuit or interface may be used for a variety of purposes to control the flow of data between a microcontroller or computer and a controlled circuit.

The power supply must be made with a 5 V voltage and the outputs must take into account the available current capacity, possibly triggering power stages.

The complete diagram of the interface is given in Figure 1.

 

Figure 1
Figure 1

 

 

The printed circuit board is shown in Figure 2.

 

Figure 2
Figure 2

 

 

The positions of the integrated circuits must be observed in the assembly and the tracks must be carefully checked so that shot does not occur.