mikroElektronika click DHT22 User manual

2 3
0100000072066
DHT22 click™manual
ver 1.00
click™
BOARD
www.mikroe.com
2. Soldering the headers
1. Introduction
3. Plugging the board in
Once you have soldered the headers your
board is ready to be placed into the desired
mikroBUS™socket. Make sure to align the
cut in the lower-right part of the board with
the markings on the silkscreen at the
mikroBUS™socket. If all the pins
are aligned correctly, push the
board all the way into the socket.
Turn the board upward again. Make sure
to align the headers so that they are
perpendicular to the board, then solder
the pins carefully.
Turn the board upside down so that
the bottom side is facing you upwards.
Place shorter pins of the header into the
appropriate soldering pads.
Before using your click™board, make sure
to solder 1x8 male headers to both left
and right side of the board. Two 1x8 male
headers are included with the board in
the package.
4. Essential features
The DHT22 click™temperature and
humidity sensor can detect temperatures
between -40 and 80 degrees centigrade
with a half a degree precision (0.5C).
The relative humidity measurement from
0–100% is accurate within 2%. Both
relative humidity and temperature data
signals have a 16Bit resolution. To get
accurate data you should set up the interval
between individual sensor readings at
least two seconds apart.
1
DHT22 click™is a temperature and
humidity measurement board carrying
the AM2302 sensor (also known as
DHT22). It’s a low cost reliable sensor
that communicates with the target board
microcontroller through a single Serial
Data Line. You can choose between
the mikroBUS™CS or INT pins for
communicating with the target board
microcontroller. The board is designed to
use either a 3.3V or a 5V power supply.
DHT22 click™

MikroElektronika assumes no responsibility or liability for any errors or inaccuracies that may appear in the present document.
Specification and information contained in the present schematic are subject to change at any time without notice. Copyright © 2014 MikroElektronika. All rights reserved.
5. DHT22 click™board schematic
8. Support
7. Code examples
MikroElektronika oers free tech support
(www.mikroe.com/support) until the end
of the product’s lifetime, so if something
goes wrong, we’re ready and willing to help!
Once you have done all the necessary
preparations, it’s time to get your click™board
up and running. We have provided examples
for mikroC™, mikroBasic™and mikroPascal™
compilers on our Libstock website. Just
download them and you are ready to start.
DHT22 click™has two jumpers (zero ohm
resistors). SDA SEL lets you select either CS
(SDA1) or INT (SDA2) for outputting the one
wire signal. The PWER SEL jumper is for
choosing between 3.3 and 5V power supplies.
6. Jumpers
R1
2K2
LD1
AN
RST
CS
SCK
MOSI
MISO
+3.3V
GND
PWM
INT
RX
TX
SCL
SDA
+5V
GND
MIKROBUS DEVICE CONN.
SDA
J1
C1
100nF
GND
VDD
SDA NC
GND
AM2302
VCC VCCVCC VCC
R2
4K7
VCC
J2
SDA SDA1
SDA2
SDA1
SDA2
R3
0R
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