A relay can be used to switch higher power devices such as motors and solenoids. If desired, the relay can be powered by a separate power supply, so, for instance, 12V solenoids can be controlled by the microcontroller.
Relay
Schematic
PCB
Activate a Relay
The following program will activate a FET or Darlington transistor connected to output B.1, which in turn will activate the relay, for a second every five seconds.
- Code Example:
-
main: high B.1 ; Switch on output B.1 pause 1000 ; Wait 1 second low B.1 ; Switch off output B.1 pause 5000 ; Wait 5 seconds goto main ; Loop back to start
Copy Code Submit an Example
Create Module
A 5V relay may be connected via a BCX38C darlington transistor create module (buzzer connected shown here).
Bill of Materials
| Description | Code | Qty | |
|---|---|---|---|
| Miniature 6V Relay SPDT | REL001 | 1 | Buy Now |
| BCX38C Darlington driver transistor | TRT002 | 1 | Buy Now |
| 1k resistor (pack 100) | RES1K | 1 | Buy Now |
| 1N4001 diode | RES041 | 1 | Buy Now |
Simulation
Submit Your Own Code!
You must be logged in to submit code examples. Login now.
Share