I2C sensors

authorOwner
19th November, 2020

Zigbee Hobbyist. Rock Pi 4 SBC

I2C sensors

authorOwner
19th November, 2020

First of all, you must specify a pin for a sensor. It is the SDA pin. Then it would help if you defined the SCL pin. For example, output 4 – BME280, and output 5 – I2C SCL.

I2C configuration for a sensor

If you connect several sensors on one bus (pin), you may define the SCL pin only once.

This image has an empty alt attribute; its file name is img1-4.png
I2C configuration for sensors on one bus

Zigbee: Accepts the “read” and “write” commands on the endpoint for the SDA pin.

Comments
Harvey Specter
Posted at 20:20 May 17, 2021
Pavel
Reply
Author

Hello, does the firmware support i2c expander like VL53L0X ? Thank you.

    Harvey Specter
    Posted at 04:32 May 18, 2021
    Owner
    Reply
    Author

    No, the firmware does not support this sensor.

Harvey Specter
Posted at 15:49 February 8, 2021
marac
Reply
Author

Hello, does the firmware support i2c expander like MCP23017? Thank you.

    Harvey Specter
    Posted at 03:37 February 9, 2021
    Owner
    Reply
    Author

    Hello. The firmware does not support this expander.

Harvey Specter
Posted at 19:54 December 14, 2020
Rozenrod
Reply
Author

I connected BME280, P05-> SCL, P06-> SDA address 76 (verified through arduino), But Zigbee2MQTT does not receive temperature data, etc., I only get “payload ‘{” l3 “: 3.2,” linkquality ” : 84, “voltage_l3”: 3.2} ‘”What should I do, am I doing something wrong?

    Harvey Specter
    Posted at 03:28 December 15, 2020
    Owner
    Reply
    Author

    Did you define the SDA pin first? For example, SDA – output1, SCL – output2.

      Harvey Specter
      Posted at 20:08 December 15, 2020
      Doublet
      Reply
      Author

      I observed the same behaviour with BME280 on a CC2530
      Output p04: SDA, p05: SCL, router mode
      Payload: {“l1″:3.45,”l2″:56,”linkquality”:113,”temperature_l2″:56,”voltage_l1″:3.5}

        Harvey Specter
        Posted at 20:32 December 15, 2020
        Doublet
        Reply
        Author

        Further testing CC2530 BME280:
        When I use P06: SDA, P07: SCL or P10: SDA, P11 SCL and try to pair in Z2M:
        the device is announced, the led is flashing each 4 seconds but no data or even linkquality is visible in MQTT? Any suggestions?

Harvey Specter
Posted at 07:55 December 11, 2020
Doublet
Reply
Author

I am using https://nl.aliexpress.com/item/32659765502.html?spm=a2g0s.9042311.0.0.27424c4dF0Pr06
The status light is flashing short, fast blinks every second

    Harvey Specter
    Posted at 08:08 December 11, 2020
    Owner
    Reply
    Author

    I think the problem is not related to the sensor. Just wait more time or try to reset the device.

Harvey Specter
Posted at 19:55 December 10, 2020
Doublet
Reply
Author

When I configure the CC2530 as in your example with a BMP280, the device does not want to pair (not in router or in end device mode). When I choose another configuration MHZ90, DS18B20 all works fine. I a using your recent software. Can you pls check while you enjoy a cup of coffee?

    Harvey Specter
    Posted at 03:43 December 11, 2020
    Owner
    Reply
    Author

    Thank you! I like coffee :).
    Did you test with BMP280 or BME280? Does the status light show somethings? I cannot repeat this problem with BME280.

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