Thingy91 P6

[Simon]

Hello,
The DevAcademy fundamentals lesson 6, example 1 shows how to connect a bme280 to a DK.

Then in lesson 6, example 2 it shows how to connect to an onboard light sensor found on the thingy91.

I'm looking at making a third example where a bme280 is connected externally to a thingy91 using P6 found on the thingy91.

This case hinted at using pins 26 & 27 on P6.

The pin map for thingy91 shows pins 26 & 27 as SPARE3 and SPARE4, or from HW file as pins 3 and pins 4 on P6 (same spot as shown in the above case).

Looking at the thingy91_nrf9160_ns.overlay file in VS sdk v2.9.0 > Devicetree > Overlay file,
it shows p26 and p27 occupied by button0 and bh1749 respectively (same light sensor bh1749 as in lesson 6 example 2).

When adding to the overlay file,

&i2c2 {
    status = "okay";
    pinctrl-0 = <&i2c2_default>;
    pinctrl-1 = <&i2c2_sleep>;
    pinctrl-names = "default", "sleep";
    mysensor: mysensor@77{
        compatible = "i2c-device";
        status = "okay";
        reg = < 0x77 >;
    };
};

&pinctrl {
	/omit-if-no-ref/ i2c2_default: i2c2_default {
		group1  {
			psels = <NRF_PSEL(TWIM_SCL, 0, 26)>,
					<NRF_PSEL(TWIM_SDA, 0, 27)>;
		};
	};

	/omit-if-no-ref/ i2c2_sleep: i2c2_sleep {
		group1  {
			psels = <NRF_PSEL(TWIM_SCL, 0, 26)>,
					<NRF_PSEL(TWIM_SDA, 0, 27)>;
			low-power-enable;
		};
	};
}; 

The overlay then indicates an error that 'Multiple pin users are assigned!'.

What piece is missing here to get the pins properly mapped to P6 on thingy91?

thank-you,

[Achim Kraus]

AFAIK, P6 is not controlled by the nRF9160 of the Thingy:91, instead it's controlled by the nRF52840.

Using an overlay for the nRF9160 will therefore not help. You would need to develop code for the nRF52840, which is usually used for the "com bridge".

Let me recommend to switch to a Thingy:91X for your example.

[Marte Myrvold]

Hi,

As Achim Kraus  states, P6 is controlled by the nRF52840 on the Thingy:91. You can find this in connector pinouts in the Thingy:91 hardware documentation. To use these pins, you would need to make firmware for this, i.e. board target thingy91_nrf52840.

The Thingy:91 X has an expansion board connector, so with this, you could connect an expansion board for the external sensor.

Best regards,
Marte