Extension for Raspberry Pi??s GPIO. 3.81 posts quality, reliable, convenient, durable. Combined with the Proto Shield, the middle can be used as a prototype expansion board. Double-sided PCB Prototyping extended area vias connecting the front sides can be welded components.
Two changeover relays Four tactile switches Eight digital inputs Eight open collector outputs 8 onboard LEDs for indicating the status of an application, debugging circuits and codes Graphical emulator