Robhuls: /* Link to forum posts */

2017-01-12T21:00:50Z

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=Purpose=
Operate the NAD D 7050 Direct Digital Network Amplifier from Domoticz.
=Dependencies - hardware / software / operating system=
*NAD D 7050 Direct Digital Network Amplifier
*python3 (sudo apt-get install python3)

=Domoticz Setup - switches, variables, version=
*Setup -> Hardware
*For type select Dummy
*Press Add
*Press the create virtual sensors blue bubble on the new device that appeared on the top
*Type NADControl for the name and select Selector for the type
*Press the create virtual sensors blue bubble again
*Type NADVolume for the name and select Dimmer for the type
*Go to the switches tab
*Edit the NADVolume slider and give them an amplifier icon
*Edit the NADControl button and give it an amplifier icon. Furthermore, link the switches to the commands for the python script as:
[[File:NADcontrol_content.png]]

=Installation instructions=
The NAD 7050 should be connected to the network and have a static IP.
=Scripts with comments=
A python script sents the commands to the NAD7050. The script must be called with the new volume setting when changing the volume and we use a LUA script for that. This can be done under setup -> more options -> events. Under event name type NAD7050 and select lua instead of blockly. Then paste the following script in the text box:

<syntaxhighlight lang="lua">
commandArray = {}
if (devicechanged['NADVolume']) then
volume = devicechanged['NADVolume']
os.execute('/home/pi/domoticz/scripts/python/nad_selector.py volume "'..volume..'"')
end
return commandArray
</syntaxhighlight>

and press save. Now we still need the python script that actually operates the NAD7050, inspired by the work of Tom Hartley (https://gist.github.com/anonymous/07cd28fe578ec49839db). *Create the following script named nad_selector.py in /home/pi/domoticz/scripts/python
*Do not forget to change the ip address to match the static IP of your NAD 7050
*And make the file executable using chmod u+x nad_selector.py
<syntaxhighlight lang="python">
#!/usr/bin/python3

TCP_IP = '192.168.10.23'
TCP_PORT = 50001
BUFFER_SIZE = 1024

import socket
import sys, time
import codecs

# Function to send codes to the NAD7050
def send(MESSAGE):
MESSAGE = codecs.decode(MESSAGE, 'hex_codec')
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))
s.send(MESSAGE)
s.close()

command = sys.argv[1]
if command == 'source':
channel = int(sys.argv[2]) # Input number from command line
send('0001020901') # Switch NAD on
time.sleep(0.5) # Otherwise the second connection is refused
send('000102030' + str(channel)) # Select input
elif command == 'volume': # Set the volume
volume_number = sys.argv[2].split(':')[1].split('%')[0]
volume = 2*int(volume_number) # NAD volume runs from 0 to 200
volume_hex = str(hex(volume)[2:]).zfill(2) # And is entered as hex
send('00010204'+volume_hex)
elif command == 'off':
send('00010207010001020207') # Enable Eco mode
time.sleep(0.5)
send('0001020900') # Off command (no longer reachable by network)
else:
print('command not recognized')
</syntaxhighlight>

=Example of use=
[[File:NADexample.png]]

=Link to forum posts=
[https://www.domoticz.com/forum/viewtopic.php?f=23&t=13663 Forum topic]

[https://gist.github.com/anonymous/07cd28fe578ec49839db The original NAD 7050 reverse engineered code]

[https://github.com/abaretta/nu.baretta.nad Homey app for the NAD7050]

NAD7050 - Revision history

Robhuls: /* Link to forum posts */