Raspberry Pi Model A+ Handleiding

Raspberry Pi Niet gecategoriseerd Model A+

Lees hieronder de 📖 handleiding in het Nederlandse voor Raspberry Pi Model A+ (4 pagina's) in de categorie Niet gecategoriseerd. Deze handleiding was nuttig voor 65 personen en werd door 2 gebruikers gemiddeld met 4.5 sterren beoordeeld

Download PDF

Pagina 1/4

Control wireless mains sockets with Arduino and

Raspberry Pi

Posted by stuartChilds on Tue, Jan 13 2015 16:39:00

LightwaveRF (LWRF) is a range of switches, dimmers and other home automation hardware

that is widely available in the UK and further afield, sometimes sold under other brands such

as Siemens. They are affordable units that are easy to work with.

Working with off shelf products, such as remotely switchable mains sockets, means that -the-

we can concentrate on control without having to deal with mains voltages directly.

A set of 3 switchable mains sockets can be bought for around £20 including a remote that –

appears to be compatible with up to 16 switches in total. Here we will replace this remote with

our own wireless hardware, so that we can have programmable control.

The LightwaveRF protocol

One great thing about the LWRF protocol is that it fairly simple and has already been reverse

engineered by people looking to build their own home automation systems. This means that

we can use readily available libraries and examples to quickly interface a microcontroller or

computer with the hardware.

The LWRF system operates on 433 MHz and uses simple On/Off Keying (OOK) modulation,

whereby the carrier is turned on and off to transmit information. Low cost transmitter modules

suitable for use with Arduino and Raspberry Pi are commonly available.

Arduino control

Hardware required:

• Arduino (any AVR based model)

• Prototyping breadboard

• 433 MHz transmitter module

• Jumper wires

• LWRF mains socket

First we will connect the radio module.

• The QAM- -TX1 433 module has 4 pins:

• – ANT (Antenna) a 174mm length of solid core wire makes for a suitable antenna.

• – VCC 5v from Arduino.

• – DATA Arduino pin 3 for the unmodified 'lwsend' sketch.

• – GND ground connection to the Arduino board.

We'll be using the excellent written by Lawrie Griffiths. Add this to your LightwaveRF library

Arduino libraries folder and upload the 'lwsend' example to your Arduino.

Now open the serial monitor and try sending '1' or '0' to the Arduino. If this looks to be

working, try pairing the Arduino to the LWRF socket by putting the socket in 'pairing mode'

(see the supplied instructions) and sending '1' over the serial monitor to the Arduino, so that

the 'on' command is sent.

The 'lwsend' sketch is pre configured to transmit compatible LWRF on/off control signals. If -

the pairing was successful you should now be able to turn the socket on and off with your

Arduino.

Raspberry Pi control

Hardware required:

• Raspberry Pi (any model)

• Prototyping breadboard

• 433 MHz transmitter module

• Jumper wires

• LWRF mains socket

The same wireless module (QAM- -TX1 433) is used in much the same way we did with the

Arduino:

• – ANT (Antenna) a 174mm length of solid core wire makes for a suitable antenna.

• – VCC 5v from Raspberry Pi.

• – - DATA Pin 12 on connector P1for the unmodified lightwaverf pi 'send' program.

• – GND ground connection to the Raspberry Pi.

Product specificaties

Merk:	Raspberry Pi
Categorie:	Niet gecategoriseerd
Model:	Model A+
Breedte:	66 mm
Diepte:	56 mm
Hoogte:	14 mm
Frequentie van processor:	700 MHz
Processormodel:	ARM1176JZFS
Ethernet LAN:	Nee
Compatibele geheugenkaarten:	MicroSD (TransFlash)
Aantal USB-aansluitingen:	1
USB-versie:	2.0
Intern geheugentype:	SDRAM
Maximum intern geheugen:	- GB
Stroomvoorziening via USB:	Ja
Wifi:	Nee