Homebrew How can I control the bottom-right LED on my Switch Lite with code?

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A lot of homebrew apps make the Switch's LED blink to signal things, but on my Lite, they just don't work. I've asked some devs but didn't get a fix. I also checked the switch-example LED code on GitHub and tried it, but still couldn't control the Lite's LED. So, I'm posting to ask: Can homebrew actually control the LED on a Switch Lite? If it's really impossible, then I guess I'll just drop this idea.
Thank you
 
Afaik, the Lite only has a white led. Nintendo tried saving a few pennies by omitting the RGB led, I guess.

My AI overlord said :

On the Nintendo Switch Lite, controlling the LED is done through the hid (Human Interface Device) services. The Switch Lite has a notification LED that can be controlled via the hidsys service.
Here's a code example using libnx (the most common Nintendo Switch homebrew library):

Code:
#include <switch.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
    consoleInit(NULL);
    
    // Initialize hidsys service
    Result rc = hidsysInitialize();
    if (R_FAILED(rc)) {
        printf("Failed to initialize hidsys: 0x%x\n", rc);
    } else {
        // Set LED pattern
        // Parameters: UniquePadId, pattern (bitmask for LED states)
        HidsysNotificationLedPattern pattern;
        memset(&pattern, 0, sizeof(pattern));
        
        // Configure the LED pattern
        // Each element represents timing (in units of 12.5ms)
        pattern.baseMiniCycleDuration = 0x8;  // Base duration
        pattern.totalMiniCycles = 0x2;         // Number of cycles
        pattern.totalFullCycles = 0x0;         // 0 = infinite
        pattern.startIntensity = 0x0;          // Start brightness (0-15)
        
        // LED cycle pattern (8 cycles, each with timing and brightness)
        pattern.miniCycles[0].ledIntensity = 0xF;      // Brightness (0-15)
        pattern.miniCycles[0].transitionSteps = 0xF;   // Fade steps
        pattern.miniCycles[0].finalStepDuration = 0xF; // Duration
        
        pattern.miniCycles[1].ledIntensity = 0x0;
        pattern.miniCycles[1].transitionSteps = 0xF;
        pattern.miniCycles[1].finalStepDuration = 0xF;
        
        // Get the unique pad ID (usually 0 for handheld mode)
        u64 UniquePadId = 0;
        
        // Set the LED pattern
        rc = hidsysSetNotificationLedPattern(&pattern, UniquePadId);
        if (R_FAILED(rc)) {
            printf("Failed to set LED pattern: 0x%x\n", rc);
        } else {
            printf("LED pattern set successfully!\n");
        }
        
        hidsysExit();
    }
    
    printf("Press + to exit\n");
    
    while (appletMainLoop())
    {
        hidScanInput();
        u64 kDown = hidKeysDown(CONTROLLER_P1_AUTO);
        
        if (kDown & KEY_PLUS)
            break;
        
        consoleUpdate(NULL);
    }
    
    consoleExit(NULL);
    return 0;
}


Important notes:
  1. LED Color: The Switch Lite's notification LED is typically white/single-color, so you can't change the actual color - only the brightness and pattern
  2. Pattern Structure: The pattern controls blinking, fading, and intensity
  3. Timing: Values are in units of 12.5ms
  4. Intensity: Values range from 0x0 (off) to 0xF (brightest)

For a simpler "turn LED on" example:
Code:
HidsysNotificationLedPattern pattern;
memset(&pattern, 0, sizeof(pattern));

// Simple solid LED
pattern.baseMiniCycleDuration = 0x1;
pattern.totalMiniCycles = 0x1;
pattern.totalFullCycles = 0x0;  // Infinite
pattern.startIntensity = 0xF;   // Full brightness
pattern.miniCycles[0].ledIntensity = 0xF;
pattern.miniCycles[0].transitionSteps = 0x0;
pattern.miniCycles[0].finalStepDuration = 0x1;

hidsysSetNotificationLedPattern(&pattern, 0);

Make sure your Makefile links against libnx and you have the proper permissions in your npdm file to access the hidsys service.
 
Switch Lite's notification LED is typically white/single-color, so you can't change the actual color - only the brightness and pattern
Afaik, the Lite only has a white led. Nintendo tried saving a few pennies by omitting the RGB led, I guess.

My AI overlord said :

On the Nintendo Switch Lite, controlling the LED is done through the hid (Human Interface Device) services. The Switch Lite has a notification LED that can be controlled via the hidsys service.
Here's a code example using libnx (the most common Nintendo Switch homebrew library):

Code:
#include <switch.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
    consoleInit(NULL);
   
    // Initialize hidsys service
    Result rc = hidsysInitialize();
    if (R_FAILED(rc)) {
        printf("Failed to initialize hidsys: 0x%x\n", rc);
    } else {
        // Set LED pattern
        // Parameters: UniquePadId, pattern (bitmask for LED states)
        HidsysNotificationLedPattern pattern;
        memset(&pattern, 0, sizeof(pattern));
       
        // Configure the LED pattern
        // Each element represents timing (in units of 12.5ms)
        pattern.baseMiniCycleDuration = 0x8;  // Base duration
        pattern.totalMiniCycles = 0x2;         // Number of cycles
        pattern.totalFullCycles = 0x0;         // 0 = infinite
        pattern.startIntensity = 0x0;          // Start brightness (0-15)
       
        // LED cycle pattern (8 cycles, each with timing and brightness)
        pattern.miniCycles[0].ledIntensity = 0xF;      // Brightness (0-15)
        pattern.miniCycles[0].transitionSteps = 0xF;   // Fade steps
        pattern.miniCycles[0].finalStepDuration = 0xF; // Duration
       
        pattern.miniCycles[1].ledIntensity = 0x0;
        pattern.miniCycles[1].transitionSteps = 0xF;
        pattern.miniCycles[1].finalStepDuration = 0xF;
       
        // Get the unique pad ID (usually 0 for handheld mode)
        u64 UniquePadId = 0;
       
        // Set the LED pattern
        rc = hidsysSetNotificationLedPattern(&pattern, UniquePadId);
        if (R_FAILED(rc)) {
            printf("Failed to set LED pattern: 0x%x\n", rc);
        } else {
            printf("LED pattern set successfully!\n");
        }
       
        hidsysExit();
    }
   
    printf("Press + to exit\n");
   
    while (appletMainLoop())
    {
        hidScanInput();
        u64 kDown = hidKeysDown(CONTROLLER_P1_AUTO);
       
        if (kDown & KEY_PLUS)
            break;
       
        consoleUpdate(NULL);
    }
   
    consoleExit(NULL);
    return 0;
}


Important notes:
  1. LED Color: The Switch Lite's notification LED is typically white/single-color, so you can't change the actual color - only the brightness and pattern
  2. Pattern Structure: The pattern controls blinking, fading, and intensity
  3. Timing: Values are in units of 12.5ms
  4. Intensity: Values range from 0x0 (off) to 0xF (brightest)

For a simpler "turn LED on" example:
Code:
HidsysNotificationLedPattern pattern;
memset(&pattern, 0, sizeof(pattern));

// Simple solid LED
pattern.baseMiniCycleDuration = 0x1;
pattern.totalMiniCycles = 0x1;
pattern.totalFullCycles = 0x0;  // Infinite
pattern.startIntensity = 0xF;   // Full brightness
pattern.miniCycles[0].ledIntensity = 0xF;
pattern.miniCycles[0].transitionSteps = 0x0;
pattern.miniCycles[0].finalStepDuration = 0x1;

hidsysSetNotificationLedPattern(&pattern, 0);

Make sure your Makefile links against libnx and you have the proper permissions in your npdm file to access the hidsys service.
Thanks for your reply, but unfortunately I’ve already switched to the OLED model,
so there’s no way for me to do further testing.
Was this code actually tested by you, or was it simply provided by AI?
If it’s the latter, then there’s a high chance it was made up by AI, because there is very little information about the Switch available online, and AI often fabricates details just to say something.
 
Thanks for your reply, but unfortunately I’ve already switched to the OLED model,
so there’s no way for me to do further testing.
Was this code actually tested by you, or was it simply provided by AI?
If it’s the latter, then there’s a high chance it was made up by AI, because there is very little information about the Switch available online, and AI often fabricates details just to say something.
Claude.ai does a pretty good job and if you compare it to some 'real' github code, all the parts seem to be there :
https://github.com/Xc987/sys-notif-LED/blob/main/sysmodule/source/main.c

There is sufficient information out there if you know where to look.
All the correct information was in documents in the Nintendo GigaLeaks from somewhere in 2021.
That has been leaking out into the open and found its way on many pages and repositories that are publicly available.
 
Actually I've tried this code and it's not working(
Could you try to create a project?
Post automatically merged:

Actually I've tried this code and it's not working(
Could you try to create a simple led project (homebrew) for lite?
Post automatically merged:

Claude.ai does a pretty good job and if you compare it to some 'real' github code, all the parts seem to be there :
https://github.com/Xc987/sys-notif-LED/blob/main/sysmodule/source/main.c

There is sufficient information out there if you know where to look.
All the correct information was in documents in the Nintendo GigaLeaks from somewhere in 2021.
That has been leaking out into the open and found its way on many pages and repositories that are publicly available.
Actually I've tried this code and it's not working(
Could you try to create a project?
Post automatically merged:

Actually I've tried this code and it's not working(
Could you try to create a simple led project (homebrew) for lite
 
Hi!
I've done it.
Now I can control led on my lite.
In future, I will add it to my project - Ryazhahand-Overlay.
Here it's, for check! Good luck)
Actually, I can say, that hoag is thery difficult to control.
 

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Hi!
I've done it.
Now I can control led on my lite.
In future, I will add it to my project - Ryazhahand-Overlay.
Here it's, for check! Good luck)
Actually, I can say, that hoag is thery difficult to control.
That's awesome!
I have no idea how you managed to do it. Is your project open source? I'd love to study it.:)

I just found your project, but it looks like this feature hasn’t been updated yet. Looking forward to your update.:wub:
 
Oh, thanks for your kode, on libnx, by controlling PWM on lite!
:yayswitch:
Post automatically merged:

That's awesome!
I have no idea how you managed to do it. Is your project open source? I'd love to study it.:)

I just found your project, but it looks like this feature hasn’t been updated yet. Looking forward to your update.:wub:
Yeah, it's going to work in version 2.2.5, by charging switch.
I will update it today or tomorrow.
 
  • Like
Reactions: TOMSUN
Oh, thanks for your kode, on libnx, by controlling PWM on lite!
:yayswitch:
Post automatically merged:


Yeah, it's going to work in version 2.2.5, by charging switch.
I will update it today or tomorrow.
Oh, thanks for your kode, on libnx, by controlling PWM on lite!
:yayswitch:
Post automatically merged:


Yeah, it's going to work in version 2.2.5, by charging switch.
I will update it today or tomorrow.
Looking forward to your update. :D
 
Hi!
I've done it.
Now I can control led on my lite.
In future, I will add it to my project - Ryazhahand-Overlay.
Here it's, for check! Good luck)
Actually, I can say, that hoag is thery difficult to control.
I just found this thread by chance after scouring for any information on how to get this working on the lite. It seems like there is very limited info on this. I also found your ultrahand fork on github but noticed that I couldn't find your implementation of the LED code in the repo. Is there any chance we would be able to see how you did it? It would be awesome to see your implementation!:)
 
I just found this thread by chance after scouring for any information on how to get this working on the lite. It seems like there is very limited info on this. I also found your ultrahand fork on github but noticed that I couldn't find your implementation of the LED code in the repo. Is there any chance we would be able to see how you did it? It would be awesome to see your implementation!:)
I have a lot of rubbish in my code. I'm trying to compare it all. And one thing - Led is working only with charging.
Also now with out it.
 
Last edited by Dimasick-git,
@Helpfullinx Here's some demo code that will turn the led on if you are connected to a network.

Code:
#include <switch.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>

PadState g_pad;
HidsysUniquePadId g_unique_pad_ids[2] = {0};
s32 g_total_entries = 0;
bool g_led_state = false; // Track current LED state

void turn_led_on() {
    HidsysNotificationLedPattern pattern;
    memset(&pattern, 0, sizeof(pattern));
    
    pattern.baseMiniCycleDuration = 0x1;
    pattern.totalMiniCycles = 0x1;
    pattern.totalFullCycles = 0x0;
    pattern.startIntensity = 0xF;
    pattern.miniCycles[0].ledIntensity = 0xF;
    pattern.miniCycles[0].transitionSteps = 0x0;
    pattern.miniCycles[0].finalStepDuration = 0x7;
    
    // Always refresh pad IDs to ensure they're current
    padUpdate(&g_pad);
    g_total_entries = 0;
    memset(g_unique_pad_ids, 0, sizeof(g_unique_pad_ids));
    
    HidNpadIdType npad_id_type = padIsHandheld(&g_pad) ? HidNpadIdType_Handheld : HidNpadIdType_No1;
    Result rc = hidsysGetUniquePadsFromNpad(npad_id_type, g_unique_pad_ids, 2, &g_total_entries);
    
    if (R_SUCCEEDED(rc) && g_total_entries > 0) {
        for(int i = 0; i < g_total_entries; i++) {
            hidsysSetNotificationLedPattern(&pattern, g_unique_pad_ids[i]);
        }
        g_led_state = true;
    }
}

void turn_led_off() {
    HidsysNotificationLedPattern pattern;
    memset(&pattern, 0, sizeof(pattern)); // Zero pattern turns LED off
    
    // Always refresh pad IDs to ensure they're current
    padUpdate(&g_pad);
    g_total_entries = 0;
    memset(g_unique_pad_ids, 0, sizeof(g_unique_pad_ids));
    
    HidNpadIdType npad_id_type = padIsHandheld(&g_pad) ? HidNpadIdType_Handheld : HidNpadIdType_No1;
    Result rc = hidsysGetUniquePadsFromNpad(npad_id_type, g_unique_pad_ids, 2, &g_total_entries);
    
    if (R_SUCCEEDED(rc) && g_total_entries > 0) {
        for(int i = 0; i < g_total_entries; i++) {
            hidsysSetNotificationLedPattern(&pattern, g_unique_pad_ids[i]);
        }
        g_led_state = false;
    }
}

void toggle_led() {
    if (g_led_state) {
        turn_led_off();
    } else {
        turn_led_on();
    }
}

bool print_ip_local() {
    int sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock < 0) {
        printf("Cannot create socket\n");
        return false;
    }
    
    // Try connecting to local broadcast address (works even without internet)
    struct sockaddr_in remote = {
        .sin_family = AF_INET,
        .sin_port = htons(9),  // Discard port
        .sin_addr.s_addr = inet_addr("255.255.255.255")  // Local broadcast
    };
    
    // Enable broadcast
    int broadcast = 1;
    if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &broadcast, sizeof(broadcast)) < 0) {
        printf("Setsockopt failed\n");
        close(sock);
        return false;
    }
    
    if (connect(sock, (struct sockaddr*)&remote, sizeof(remote)) < 0) {
        printf("Local network not available\n");
        close(sock);
        return false;
    }
    
    // Get the local address
    struct sockaddr_in local;
    socklen_t len = sizeof(local);
    if (getsockname(sock, (struct sockaddr*)&local, &len) == 0) {
        printf("Your Local IP Address: %s\n", inet_ntoa(local.sin_addr));
            close(sock);
            return true;
    } else {
        printf("Could not get IP address\n");
    }
    
    close(sock);
    return false;
}

// Function to run when we have network connectivity
void on_network_connected() {
    turn_led_on();
}

// Function to run when no network is available
void on_network_disconnected() {
    turn_led_off();
}

int main(int argc, char *argv[]) {
    consoleInit(NULL);
    
    padConfigureInput(1, HidNpadStyleSet_NpadStandard);
    padInitializeDefault(&g_pad);
    hidsysInitialize();
    
    bool network_available = false;
    
    if (R_FAILED(socketInitializeDefault())) {
        printf("Network unavailable\n");
    } else {
        network_available = print_ip_local();
        socketExit();
    }
    
    
    // Execute appropriate function based on network status
    if (network_available) {
        on_network_connected();
    } else {
        on_network_disconnected();
    }
    
    while (appletMainLoop()) {
        padUpdate(&g_pad);
        u64 kDown = padGetButtonsDown(&g_pad);
        
        if (kDown & HidNpadButton_A) {
            //toggle_led(); // Toggle notification led between on and off
        }
        
        if (kDown & HidNpadButton_Plus)
            {
                turn_led_off();
                break;
            }
        
        consoleUpdate(NULL);
    }
    
    consoleExit(NULL);
    hidsysExit();
    return 0;
}

That's pretty much how the led works.
 
@Helpfullinx Here's some demo code that will turn the led on if you are connected to a network.

Code:
#include <switch.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>

PadState g_pad;
HidsysUniquePadId g_unique_pad_ids[2] = {0};
s32 g_total_entries = 0;
bool g_led_state = false; // Track current LED state

void turn_led_on() {
    HidsysNotificationLedPattern pattern;
    memset(&pattern, 0, sizeof(pattern));
   
    pattern.baseMiniCycleDuration = 0x1;
    pattern.totalMiniCycles = 0x1;
    pattern.totalFullCycles = 0x0;
    pattern.startIntensity = 0xF;
    pattern.miniCycles[0].ledIntensity = 0xF;
    pattern.miniCycles[0].transitionSteps = 0x0;
    pattern.miniCycles[0].finalStepDuration = 0x7;
   
    // Always refresh pad IDs to ensure they're current
    padUpdate(&g_pad);
    g_total_entries = 0;
    memset(g_unique_pad_ids, 0, sizeof(g_unique_pad_ids));
   
    HidNpadIdType npad_id_type = padIsHandheld(&g_pad) ? HidNpadIdType_Handheld : HidNpadIdType_No1;
    Result rc = hidsysGetUniquePadsFromNpad(npad_id_type, g_unique_pad_ids, 2, &g_total_entries);
   
    if (R_SUCCEEDED(rc) && g_total_entries > 0) {
        for(int i = 0; i < g_total_entries; i++) {
            hidsysSetNotificationLedPattern(&pattern, g_unique_pad_ids[i]);
        }
        g_led_state = true;
    }
}

void turn_led_off() {
    HidsysNotificationLedPattern pattern;
    memset(&pattern, 0, sizeof(pattern)); // Zero pattern turns LED off
   
    // Always refresh pad IDs to ensure they're current
    padUpdate(&g_pad);
    g_total_entries = 0;
    memset(g_unique_pad_ids, 0, sizeof(g_unique_pad_ids));
   
    HidNpadIdType npad_id_type = padIsHandheld(&g_pad) ? HidNpadIdType_Handheld : HidNpadIdType_No1;
    Result rc = hidsysGetUniquePadsFromNpad(npad_id_type, g_unique_pad_ids, 2, &g_total_entries);
   
    if (R_SUCCEEDED(rc) && g_total_entries > 0) {
        for(int i = 0; i < g_total_entries; i++) {
            hidsysSetNotificationLedPattern(&pattern, g_unique_pad_ids[i]);
        }
        g_led_state = false;
    }
}

void toggle_led() {
    if (g_led_state) {
        turn_led_off();
    } else {
        turn_led_on();
    }
}

bool print_ip_local() {
    int sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock < 0) {
        printf("Cannot create socket\n");
        return false;
    }
   
    // Try connecting to local broadcast address (works even without internet)
    struct sockaddr_in remote = {
        .sin_family = AF_INET,
        .sin_port = htons(9),  // Discard port
        .sin_addr.s_addr = inet_addr("255.255.255.255")  // Local broadcast
    };
   
    // Enable broadcast
    int broadcast = 1;
    if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &broadcast, sizeof(broadcast)) < 0) {
        printf("Setsockopt failed\n");
        close(sock);
        return false;
    }
   
    if (connect(sock, (struct sockaddr*)&remote, sizeof(remote)) < 0) {
        printf("Local network not available\n");
        close(sock);
        return false;
    }
   
    // Get the local address
    struct sockaddr_in local;
    socklen_t len = sizeof(local);
    if (getsockname(sock, (struct sockaddr*)&local, &len) == 0) {
        printf("Your Local IP Address: %s\n", inet_ntoa(local.sin_addr));
            close(sock);
            return true;
    } else {
        printf("Could not get IP address\n");
    }
   
    close(sock);
    return false;
}

// Function to run when we have network connectivity
void on_network_connected() {
    turn_led_on();
}

// Function to run when no network is available
void on_network_disconnected() {
    turn_led_off();
}

int main(int argc, char *argv[]) {
    consoleInit(NULL);
   
    padConfigureInput(1, HidNpadStyleSet_NpadStandard);
    padInitializeDefault(&g_pad);
    hidsysInitialize();
   
    bool network_available = false;
   
    if (R_FAILED(socketInitializeDefault())) {
        printf("Network unavailable\n");
    } else {
        network_available = print_ip_local();
        socketExit();
    }
   
   
    // Execute appropriate function based on network status
    if (network_available) {
        on_network_connected();
    } else {
        on_network_disconnected();
    }
   
    while (appletMainLoop()) {
        padUpdate(&g_pad);
        u64 kDown = padGetButtonsDown(&g_pad);
       
        if (kDown & HidNpadButton_A) {
            //toggle_led(); // Toggle notification led between on and off
        }
       
        if (kDown & HidNpadButton_Plus)
            {
                turn_led_off();
                break;
            }
       
        consoleUpdate(NULL);
    }
   
    consoleExit(NULL);
    hidsysExit();
    return 0;
}

That's pretty much how the led works.
I couldn't see here pattern for lite model. I think it's not working on Nintendo Switch Lite.
 
I couldn't see here pattern for lite model. I think it's not working on Nintendo Switch Lite.
I don't have a lite switch, I assumed the code would be similar or the same though. Surely when they make games they don't make 2 different software versions, one for v1/oled/lite.....
 

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