Thingy:53 sensor output to another board using BLE

[Karthik Lakshmanan]

Hello,

I am working on a project that requires me to use the Thingy:53 as a sensor hub, that reads out data from all the sensors (the IMU, the environment sensor, etc.) to an Nvidia Jetson NX board. I am fine with using UART or BLE, but am confused about how to go about reading out raw data from each of the sensors. I have tried looking around for examples, but none seem to work for my specific usecase.

Requesting guidance on how to interface the Thingy:53 with the Jetson NX board to read out sensor data using BLE or any other protocol that might work.

Regards,

Karthik Lakshmanan

[Kenneth]

Hello,

Check out:  Reading Thingy:53 sensor data using Bluetooth LE 

Kenneth

[Karthik Lakshmanan]

Hello!

I have programmed the Thingy 53 to work as the Sensor hub described in the link you suggested. I tried reading the data using the nRF connect app for mobile, and the values are being updated, but all I see are hex values. How exactly do I interpret them? I can get what sensor gives what hex value from the UUIDs, but what exactly do the hex values that they send correspond to?

Regards,
Karthik Lakshmanan

[Kenneth]

I assume you will need to study the sensor documentation for the sensor in question to understand the format. For instance in in the code I can find:

    err = sensor_channel_get(bme688Dev, SENSOR_CHAN_HUMIDITY, &humidity_value);
    if(err)
    {
        printk("Failed to fetch humidity sample");
        return err;
    }
    sensor_hub_update_humidity(m_connection_handle, (uint8_t*)(&humidity_value.val1), sizeof(humidity_value.val1));
 

If I open bme680.c I can find:

	case SENSOR_CHAN_HUMIDITY:
		/*
		 * data->calc_humidity has a resolution of 0.001 %RH.
		 * So 46333 equals 46.333 %RH.
		 */
		val->val1 = data->calc_humidity / 1000;
		val->val2 = (data->calc_humidity % 1000) * 1000;
		break;

Kenneth