The Floor is Lava

Short description	Required knowledge level	Estimated duration	Additional hardware and software requirements
Play "The floor is lava" with a LiDAR scanner detecting infringed fields.	Basic	20-40 Minutes	Several people or objects

In this project, the aim is to create a setup for the game "The floor is lava" with a LiDAR sensor. The LiDAR can distinguish static objects and moving objects moving through a parcours. A basic Python script reads out the sensor data and plays a sound once a person touching the floor is detected.

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.

• 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 that infringes the field.

• 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

output = 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'
• Complete code:

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')

• Now, you can walk through the parcours and check if the code is working correctly.
• If you like, you can use other sounds or variations of the game.