GPIO Pin output not working as same as LEDs on Board.

[Tushar S]

I m using nrf52840-DK Board.

For CTL example i got the perfect output on board LEDs 1 to 4.

Then i cut the solder bridge (SB5-SB8)and then used GPIO pinout for external LED light.

When i use GPIO pinout P0.13 to P0.16 as output and Connected the External dimmable driver led light.

I didn't get the same output as i got on Borad LEDs.

Problem:

On CTL example (nrf52 5.0 SDK) at whatever point the slider is left with. It will dim the light which has lower intensity.

For example: IF Warm is at high intensity 80% and cool is at 20%, the dimming will be of cool light only.

The Dimming of The warm and cool light does not go together.

The only time external light dimmes both cold and Warm light is when both are on 50% percent.

what is that i m missing. i have gone through the Diagram also with detail in documentation.

please help me on my regarding problem.

[Jared]

Hi,

CTL example

Exactly what example is this? Are you using nRF5 SDK or nRF Connect SDK?

1. Could you share your code?
2. What does the voltage look like on the pins when you measure it? Is it as expected?
   
   
   

regards

Jared

 

[Tushar S]

It is nRF5 SDK

It's a CTL Example given in nRF 5 SDK Examples.

The voltage output 3v at 100% on the app.

Please try to understand the question

QUESTION :

The Question is that the CTL Example Code Works on the nrf52840 DK Board LED(1,2,3,4).

When I Connect the External Dimmable driver LED Light to Port(P0.13, P0.14, P0.15, P0.16).

It works differently compared to LEDs on Board. why is that?

[Jared]

Hi,

Could you share the datasheet of the LED light that you're using?

regards

Jared 

[Tushar S]

Jared,

Can we have a video call? I will be able to explain everything.

[Jared]

Hi,

I think the issue is understood, you experience that the LED doesn't get dimmed as you expected it to. I therefore suggest that you should measure the output of the pins and verify that it's the same as when you use the DK unconfigured. My guess is that it's the same unless you have changed the example.

I therefore suggested that you could share the datasheet of the LED that you're using. Most likely you would have to test and adjust with the PWM functions in main.c so that it fits your LED light.

regards

Jared 

[Tushar S]

Jared, it would take a long time to address the problem and cure it.

can we please have a video call, I have already lost 3 weeks to this problem?

[Jared]

Hi, 

What region are you located at?

A video call wouldn't solve the issue any faster.  As it says in the example:

The photometrically accurate implementation of the tunable white light is out of scope of this example.

What I wrote in my previous reply still stands, you have to test and adjust with the specific LED that you're using.

regards

Jared

[Tushar S]

hi,

I am from Pune, Maharashtra, India.

Okay, let me try what you have suggested and get back to you with its output.

[Jared]

also,  please share the datasheet of the LED

[Tushar S]

it's a normal LED.

Attach datasheet

tlur640.pdf