Skip to main content

How To: Relay Module

With our Relay Module you can easily control high voltage/current circuits. This module is specially designed to consume low levels of power.

info

The relay consumes power only when changing state.

References​

tip

In the example, the Relay I2C address is set as TWR_MODULE_RELAY_I2C_ADDRESS_DEFAULT, you can also use TWR_MODULE_RELAY_I2C_ADDRESS_ALTERNATE if you want to use a second Relay Module on one device.

You will just have to solder the 0-ohm resistor to the second position on the Relay Module.

Example​

info

In the example below, the relay on the Relay Module will turn On/Off every time you press the button on the Core Module or Button Module.

Relay Module Pulse Code Example

#include <application.h>

twr_module_relay_t relay;
twr_button_t button;

void button_event_handler(twr_button_t *self, twr_button_event_t event, void *event_param)
{
    (void) self;
    (void) event_param;

    if (event == TWR_BUTTON_EVENT_PRESS)
    {
        twr_module_relay_toggle(&relay);
    }
}

void application_init(void)
{
    twr_module_relay_init(&relay, TWR_MODULE_RELAY_I2C_ADDRESS_DEFAULT);
    twr_module_relay_set_state(&relay, false);

    twr_button_init(&button, TWR_GPIO_BUTTON, TWR_GPIO_PULL_DOWN, false);
    twr_button_set_event_handler(&button, button_event_handler, NULL);
}