int relayPins[] = 2, 3, 4, 5; // Arduino pins connected to IN1 to IN4
+-------------------+ | Arduino Uno | | | | Pin 2 |--------> [ IN1 ] | Pin 3 |--------> [ IN2 ] | Pin 4 |--------> [ IN3 ] 4-Channel Relay Module | Pin 5 |--------> [ IN4 ] | | | 5V |--------> [ VCC ] | GND |--------> [ GND ] +-------------------+ 1. Component Selection
void setup() for (int i = 0; i < 4; i++) pinMode(relayPins[i], OUTPUT);
Connect the (Normally Open) terminal of Channel 1 to one terminal of the LAMP. 4 channel relay module library for proteus new
: Early simulations required using the generic "RELAY" component from the Proteus Device Library
Close all active instances of the Proteus application and relaunch it to refresh the component database. Simulating a 4-Channel Relay in Proteus
While Proteus contains individual components like standalone relays, transistors, and diodes, using them to build a 4-channel module from scratch is tedious. A dedicated library provides several advantages: int relayPins[] = 2, 3, 4, 5; //
If you are an electronics engineer, an embedded systems developer, or a hobbyist working on home automation, you have likely faced one common hurdle: simulating high-power loads safely. You cannot always connect a 220V bulb or an industrial motor directly to your microcontroller (Arduino, PIC, or 8051) without risking damage. This is where the comes in, and where simulation software like Proteus becomes invaluable.
| Component | Library | Quantity | | :--- | :--- | :--- | | Arduino Uno | ARDUINO | 1 | | | USERLIB | 1 | | Resistor 220 Ohm | RESISTOR | 4 | | LED-RED | LED | 4 | | Ground Terminal | GROUND | 1 | | Power Terminal (+5V) | POWER | 1 |
. This new library provides a single component with four input pins (IN1-IN4) and power pins (VCC, GND), drastically reducing circuit clutter. The 2025 Updates : Recent versions of the library, showcased in New Arduino Relay Modules (2025) Simulating a 4-Channel Relay in Proteus While Proteus
Physical boards use optocouplers (like the 817 series) for electrical isolation. A good library model simulates this logic behavior accurately.
Installing third-party library files ( .IDX and .LIB ) in Proteus takes less than two minutes. Follow these steps: