NAD7050

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:

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:

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

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

#!/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')

Example of use

Link to forum posts

Forum topic

The original NAD 7050 reverse engineered code

Homey app for the NAD7050