Relay
                
            | port: | 
                                                                                                    Grove: A1 (C16, C17) | 
                        
| interface: | digital | 
| input values | 
                                     1/0, on/off  | 
                            
| Further information: | https://www.youtube.com/watch?v=q3HrQhl3n4E | 
| Order: | https://www.conrad.de/de/p/seeed-studio-grove-relay-digital-open-switch-with-peak-voltage-250v-10a-802236526.html | 
A relay is a circuit operated by an electric current that can be used to remotely switch another circuit. Since it can accept the two values on and off of a switch and requires an action from the control circuit as input, it is a digital actuator.