Hi,

You can order Si115x/33-OPT-EVB to evaluate the sensor.

https://www.silabs.com/products/development-tools/sensors/si1133-53-optical-evaluation-kit

Regards,

Tony

Hi,

We have example code that converts UV raw data to UV index. Please see the knowledge base article below.

https://www.silabs.com/community/sensors/knowledge-base.entry.html/2017/12/13/si1133_calibrationa-rUL9

Regards,

Tony

Hi,

The reading you got is expected.

I have some recommendations for your code:

1. If you use forced measurement mode, you don't have to issue pause command. The measurement will only be done once upon force command.

2. Add delay or poll IRQ_STATUS register to check if the result is ready after force command. You may not get the correct value if you read the output as soon as you perform the measurement.

Regards,

Tony

Hi,

The raw data should be close to 0 if there's no sunlight (indoor). You can ignore negative values as that's just the noise.

We don't have a way to compute UV intensity. If you have a reference device that can measure UV intensity, you may be able to compare that against the raw data read from the sensor and see if you can derive a formula to compute that.

Regards,

Tony

Yes, our algorithm will report heart rate directly. I'd recommend you to contact our local sales/FAE first and get a better understanding of our HRM solution before moving on.

Regards,

Tony

Yes, you can refresh the project, clean the existing build and re-build the project. I think it should work fine.

Regards,

Tony

Hi,

HRM requires an algorithm to post-process the sensor's data. So the accuracy of HRM is a combination of the sensor's SNR as well as the algorithm's performance.

All the collateral of Si1172 is only available under NDA.

Regards,

Tony

Hi,

I don't see any error building the project in SS. What's the SDK version you're using? Can you check if it's up-to-date (v2.6.2)?

You can set LED_TRIM in MEASCONFIGx register to 2 to increase the LED current by 9%.

Regards,

Tony

Hi,

There's no UV from incandescent light. It's expected to get close to zero readings indoor.

Regards,

Tony

Hi,

Yes, you should replace that with your own I2C driver as it's platform dependent. We didn't implement that in the example code, but only provided a function prototype.

Regards,

Tony