Bmp280 + htu21d

Novica_Miric · January 1, 2022, 8:24pm

Hi all, which pins should I use for combining these two sensors on NodeMCU v3?

Can I use D3 and D4 for both?

Or should I use D7 for HTU21d

Thanks

pjg · January 1, 2022, 8:35pm

opendata-stuttgart/sensors-software/blob/master/airrohr-firmware/Readme.md

# airRohr Sensor Firmware for SPS30, SDS011, DHT22, BMP180, BMP/E 280 and many more

## Features:
* many environmental and air quality sensors can be used concurrently
* Integration in Sensor.Community (formerly Luftdaten.Info)
* Configuration via HTTP in local WiFi or with a Sensor-as Access-Point
* Support for OLED- and LCD-Displays (SSD1306, SH1106 and LCD1602, LCD2004)
* Wide selection of API integrations for measurement reporting
* Ability to print measurements as CSV via USB-serial
* Used with ESP8266 (NodeMCU v2/v3 and compatible) and ESP32 (experimental)

## Contributing

Please refer to [Contributing README](./Contributing.md) for details.

## WiFi configuration
For German Version see: [Konfiguration der Sensoren](https://github.com/opendata-stuttgart/meta/wiki/Konfiguration-der-Sensoren)

If a (previously) configured WiFi is not reachable within 20 seconds after power-on,
the firmware flips itself into AP mode and creates a WiFi network in the form `airRohr-\[Sensor-ID\]`.

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pjg · January 1, 2022, 8:36pm

Is the HTU supported ?

Novica_Miric · January 1, 2022, 8:37pm

Yes, but I am not sure how to combine it with BMP280

ricki-z · January 1, 2022, 9:14pm

The HTU21D is also a I2C device, so it’s using the same pins like the other I2C devices, D3 and D4.
I2C is a serial bus.