Merge pull request #650 from tannewt/merge_2x3.0.0-alpha.2

Merge in commits from 2.x branch.

1 files changed, 0 insertions, 65 deletions

diff --git a/docs/esp8266/tutorial/dht.rst b/docs/esp8266/tutorial/dht.rst
deleted file mode 100644
index 1602e8a33..000000000
--- a/docs/esp8266/tutorial/dht.rst
+++ /dev/null
@@ -1,65 +0,0 @@
-Temperature and Humidity
-========================
-
-DHT (Digital Humidity & Temperature) sensors are low cost digital sensors with
-capacitive humidity sensors and thermistors to measure the surrounding air.
-They feature a chip that handles analog to digital conversion and provide a
-1-wire interface. Newer sensors additionally provide an I2C interface.
-
-The DHT11 (blue) and DHT22 (white) sensors provide the same 1-wire interface,
-however, the DHT22 requires a separate object as it has more complex
-calculation. DHT22 have 1 decimal place resolution for both humidity and
-temperature readings. DHT11 have whole number for both.
-
-A custom 1-wire protocol, which is different to Dallas 1-wire, is used to get
-the measurements from the sensor. The payload consists of a humidity value,
-a temperature value and a checksum.
-
-To use the 1-wire interface, construct the objects referring to their data pin::
-
-    >>> import dht
-    >>> import machine
-    >>> d = dht.DHT11(machine.Pin(4))
-
-    >>> import dht
-    >>> import machine
-    >>> d = dht.DHT22(machine.Pin(4))
-
-Then measure and read their values with::
-
-    >>> d.measure()
-    >>> d.temperature()
-    >>> d.humidity()
-
-Values returned from ``temperature()`` are in degrees Celsius and values
-returned from ``humidity()`` are a percentage of relative humidity.
-
-The DHT11 can be called no more than once per second and the DHT22 once every
-two seconds for most accurate results. Sensor accuracy will degrade over time.
-Each sensor supports a different operating range. Refer to the product
-datasheets for specifics.
-
-In 1-wire mode, only three of the four pins are used and in I2C mode, all four
-pins are used. Older sensors may still have 4 pins even though they do not
-support I2C. The 3rd pin is simply not connected.
-
-Pin configurations:
-
-Sensor without I2C in 1-wire mode (eg. DHT11, DHT22, AM2301, AM2302):
-
-    1=VDD, 2=Data, 3=NC, 4=GND
-
-Sensor with I2C in 1-wire mode (eg. DHT12, AM2320, AM2321, AM2322):
-
-    1=VDD, 2=Data, 3=GND, 4=GND
-
-Sensor with I2C in I2C mode (eg. DHT12, AM2320, AM2321, AM2322):
-
-    1=VDD, 2=SDA, 3=GND, 4=SCL
-
-You should use pull-up resistors for the Data, SDA and SCL pins.
-
-To make newer I2C sensors work in backwards compatible 1-wire mode, you must
-connect both pins 3 and 4 to GND. This disables the I2C interface.
-
-DHT22 sensors are now sold under the name AM2302 and are otherwise identical.