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by Aaron Brady.
Original Post: Weather
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Just a quickie project, mostly consisting of smushing Adafruit modules and eBay
modules together in hardware, and a few choice libraries in software.
I’ve moved to Canada and I have a garage with mains power. I’ve never been
through this kind of winter before, so I thought it would be interesting to log
the inside and outside temperature and outside barometric pressure.
While there is power,
there’s no connectivity in the garage, so I’m following in the footsteps of
some of my friends back in England, and using a pair of Nordic nRF24 modules to
establish a reliable radio link.
I tested my set up by starting with low power amplifier settings on the radios
and using an example sketch provided with the library. It might seem like
setting power to the maximum is the best, but that also puts the most load on
your 3.3V voltage regulator, and some Arduinos and clones don’t deal well with
that.
Luckily, I was able to verify that mine does, and use that. I also only
transmit at 250Kbps, which results in acceptable performance at higher ranges.
Sensor Node
Arduino Pin
BMP180 Pin
nRF2401+ Pin
GND
GND
GND
VCC
VCC
-
3.3
-
VCC
7
-
CE
8
-
CSN
11
-
MOSI
12
-
MISO
13
-
SCK
A4
SDA
-
A5
SCL
-
Receiver Node
Arduino Pin
nRF2401+ Pin
GND
GND
3.3
VCC
7
CE
8
CSN
11
MOSI
12
MISO
13
SCK
Reading the Output
As long as the Receiver node can pick up the signal from the Sensor node, you’ll get regular data output over the USB serial:
Because I have a local Graphite install, I can just send metrics to
127.0.0.1:2003 with a tiny Ruby script, which parses the serial output
and spits Carbon formatted data over TCP to my Graphite install.
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