Human Piano / Air Piano

Short description	Required knowledge level	Estimated duration	Additional hardware and software requirements
Create multiple fields and a basic Python application to play sounds based on field infringements.	Advanced	30-60 Minutes	Several people or objects

In this project, the aim is to simulate keys of a piano by drawing fields that play different sounds when being infringed by objects. A basic python script runs the logic of the different notes.

Instruction

Note: The mentioned code snippets are just examples. Feel free to use your own code to run the project.

Field evaluation

• Connect your device as mentioned in Getting Started. The UI should now look something like this:

• Log in as Service, password: servicelevel and press Keep Default Password
• Select Application > Field evaluation and draw a field in a suitable size.

• If useful, perform a Teach-in to ignore all static objects. Stop the teach-in after around 10 seconds.

• Define the field parameters, e.g. the max. blanking size which corresponds to the minimal oject size the infringes the field.

• Draw multiple fields right next to each other.

• You can ignore Output

Coding

• Open a coding environment with Python such as Visual Studio Code.
• Enter the following code:

import socket

HOST = "192.168.0.1"
PORT = 2111

def sopas(cmd):
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        s.settimeout(2)
        s.connect((HOST, PORT))
        telegram = b"\x02" + cmd.encode("ascii") + b"\x03"
        s.sendall(telegram)
        return s.recv(1024).decode("ascii").strip("\x02\x03")

# Enable measurement
print(sopas("sMN SetAccessMode 03 F4724744"))
print(sopas("sMN LMCstartmeas"))

# Read field evaluation
response = sopas("sRN FieldEvaluationResult")
print("Field evaluation:", response)

• The result should look something like this:

• 2 = Field not infringed, 4 = Field infringed
• Now, read out a specific value (field infringed or not infringed, e.g. to play a sound or turn on a light).

Code

field1 = response[38:39]
print(output)

• 38:39 refers to the position in the result (first digit 2 or 4)
• Check if the result is giving out the right position (either 2 for "not infringed" or 4 for "infringed").
• Play a sound if the field is infringed; otherwise, display the text "error". Important: Type "import winsound" on the second line of the code (below the previous "import socket")

Code

import winsound


if output == '4':
    winsound.Beep(200, 1000)
else:  print('error')

• To read out sensor data continuously, include the code in 'while True'

Code

import socket
import winsound
HOST = "192.168.0.1"
PORT = 2111
def sopas(cmd):
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.settimeout(2)
    s.connect((HOST, PORT))
    telegram = b"\x02" + cmd.encode("ascii") + b"\x03"
    s.sendall(telegram)
    return s.recv(1024).decode("ascii").strip("\x02\x03")
# Enable measurement
print(sopas("sMN SetAccessMode 03 F4724744"))
print(sopas("sMN LMCstartmeas"))

while True:
# Read field evaluation
response = sopas("sRN FieldEvaluationResult")
print("Field evaluation:", response)

output= response[38:39]
#print(output)

if output == '4':
    winsound.Beep(200, 1000)
else:  print('error')

• Add all fields to your code
• Choose the suitable frequencies for your notes.

Frequencies

• Complete code:

Code

import winsound

if output == '4':
    x
    import socket
import winsound

HOST = "192.168.0.1"
PORT = 2111

def sopas(cmd):
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.settimeout(2)
    s.connect((HOST, PORT))
    telegram = b"\x02" + cmd.encode("ascii") + b"\x03"
    s.sendall(telegram)
    return s.recv(1024).decode("ascii").strip("\x02\x03")

# Enable measurement
print(sopas("sMN SetAccessMode 03 F4724744"))
print(sopas("sMN LMCstartmeas"))

#music notes
noteC=262
noteD=298
noteE=330
noteF=350
noteG=392
noteA=440

fieldposition=37
duration=300

while True:
# Read field evaluation
response = sopas("sRN FieldEvaluationResult")
print("Field evaluation:", response)

field1= response[fieldposition:fieldposition+1]
field2= response[fieldposition+4:fieldposition+5]
field3= response[fieldposition+8:fieldposition+9]
field4= response[fieldposition+12:fieldposition+13]
field5= response[fieldposition+16:fieldposition+17]
field6= response[fieldposition+20:fieldposition+21]
#print(field1 +' '+ field2)


if field1 == '4':
    winsound.Beep(noteC, duration)
if field2 == '4':
    winsound.Beep(noteD, duration)
if field3 == '4':
    winsound.Beep(noteE, duration)
if field4 == '4':
    winsound.Beep(noteF, duration)
if field5 == '4':
    winsound.Beep(noteG, duration)
if field6 == '4':
    winsound.Beep(noteA, duration)
else:  print('error')

• Try playing a song by infringing the correct fields.

Want more difficulty levels?

• Play note only when switching notes
• Include semitones, i.e., adjacent keys