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#1 2015-12-06 23:03:26

spiralux
Member
From: Australia
Registered: 2015-11-24
Posts: 35

PiDome Device Creation Tutorial Part 1 - Building the sensor node

I'm building a new node for the man cave to control more LED strip lights, but we'll document the build process along with testing along the way.

First I grabbed a piece of perf board from the cupboard and soldered an Arduino Nano to it. Note the breaks in the track between the Arduino pins, these were done with a 4mm drill bit.

Image_01_Nano.jpg Image_02_Nano_Underneath.jpg

I mount the radio on it's own header pins (due to problems in the past), as these are in a 2 x 4 arrangement I need to cut the tracks to avoid shorts as shown below.

Image_03_Track_Cuts.jpg Image_04_Track_Cuts_Soldered.jpg
Image_05_Radio_Header.jpg Image_06_Radio_Mounted.jpg Image_07_Radio_Power.jpg


Now that I've got this far I like to check that everything is working properly, ie. no 'check wires' or 'radio init failed' messages.

First_run_of_node_30.jpg

Now let's mount the DHT11.

Image_11_DHT11_Mounted_Underneath.jpg Image_12_DHT11_Mounted_Top.jpg Image_13_DHT11_Power_Underneath.jpg

Now let's hook it back up to the serial monitor and check that the temperature and humidity are being reported.

Node_30_after_DHT11.jpg

As can be seen from the output, the DHT11 is reporting temperature and humidity to the processor.

Now let's add the LDR, I usually mount them in a header to allow for later extension of the leads whenever the sensor node is finally mounted.

I'm using analogue pin A7 for the LDR as it's close proximity to the +5V and GND make wiring a snap. There is a 22K resistor in series with the LDR and pin A7 connects at the junction of the resistor and the LDR.

Image_14_LDR_Header.jpg Image_15_LDR_Mounted.jpg

Right, let's plug it into the serial monitor once again and we should see the LDR reporting values.

Node_30_after_LDR.jpg

As can be seen from above the light level is being reported, the light level of 4 being almost dark and the level of 97 was with a light shining directly on the sensor.

The next parts will detail the code running on the sensor and the steps required to integrate it with PiDome.

Originally posted on http://ens.one/index.php/PiDomeBlog/bui … ensor-node

Last edited by spiralux (2015-12-06 23:52:27)


E pluribus anum.

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#2 2017-06-04 21:07:55

Rlnqielavege
Member
Registered: 2017-06-04
Posts: 20

Re: PiDome Device Creation Tutorial Part 1 - Building the sensor node

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#3 2017-09-20 11:42:41

Jeffstewly
Member
From: Jamaica
Registered: 2017-09-20
Posts: 20
Website

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