linux.i2c.bme280

Interact with the popular BME280 sensor via I2C from Clojure JVM.

Relies on helins.linux.i2c for performing I2C operations.

Usage

This is an overview.

The full API is available on Cljdoc.

In short, without error handling :

(require '[helins.linux.i2c        :as i2c]
         '[helins.linux.i2c.bme280 :as bme280])


(with-open [bus (i2c/bus "/dev/i2c-1")]

  (i2c/select-slave bus
                    0x76)

  (let [;; Those compensation words will be used for adjusting raw data received from sensors.
        compensation-words (bme280/compensation-words bus)

        ;; Configuration map.
        config             {:bme280/iir-filter               16
                            :bme280/mode                     :forced
                            :bme280/oversampling.humidity    :x1
                            :bme280/oversampling.pressure    :x2
                            :bme280/oversampling.temperature :x4}

        ;; Computes how many milliseconds a single measurement takes, at most.
        wait-ms            (:maximum (bme280/cycle-duration config))]
    (bme280/configure bus
                      config)
    (Thread/sleep wait-ms)
    (bme280/read-sensors bus
                         compensation-words)

    => {:bme280/humidity    46.932
        :bme280/pressure    960.3226
        :bme280/temperature 23.3}
    ))

License

Copyright © 2017 Adam Helinski

Licensed under the term of the Mozilla Public License 2.0, see LICENSE.