Control Remote Mains Switches using Python

For this project we are assuming, that you have a Python development environment set up and that you have a rudimentary understanding of the Python language.

If you are totally new to Python itself you should start here. If you are new to the Tinkerforge API, you should start here.

We are also assuming that you have the remote control connected to an Industrial Quad Relay Bricklet as described here.


The goal of this little project is to give an idea how the relays of the Industrial Quad Relay Bricklet have to be switched to turn the mains switches on/off.

The following code uses set_monoflop() to trigger a button press on the remote control. A monoflop will set a new state (relay open or close) and hold it for a given time (1.5s in the example code). After this time the previous state is restored. This approach simulates a button click that takes 1.5s (1500ms).

According to the hardware setup section the inputs of the remote control should be connected as follows:

Signal Relay
A 0
B 1
ON 2

To trigger the switch "A ON" of the remote control the relays 0 and 2 of the Industrial Quad Relay Bricklet have to be closed. This is represented by the selection mask (1 << 0) | (1 << 2).

So the monoflop function should be called with this selection mask and a time of 1500ms to simulate a button press of "A ON". See the following source code for a minimal example.

Source Code


#!/usr/bin/env python
# -*- coding: utf-8 -*-

HOST = "localhost"
PORT = 4223
UID = "ctG" # Change to your UID

VALUE_A_ON  = (1 << 0) | (1 << 2) # Pin 0 and 2 high
VALUE_A_OFF = (1 << 0) | (1 << 3) # Pin 0 and 3 high
VALUE_B_ON  = (1 << 1) | (1 << 2) # Pin 1 and 2 high
VALUE_B_OFF = (1 << 1) | (1 << 3) # Pin 1 and 3 high

from tinkerforge.ip_connection import IPConnection
from tinkerforge.bricklet_industrial_quad_relay import IndustrialQuadRelay

if __name__ == "__main__":
    ipcon = IPConnection() # Create IP connection
    iqr = IndustrialQuadRelay(UID, ipcon) # Create device object

    ipcon.connect(HOST, PORT) # Connect to brickd
    # Don't use device before ipcon is connected

    iqr.set_monoflop(VALUE_A_ON, 15, 1500); # Set pins to high for 1.5 seconds