I think this topic could be helpfull for all of us.

Here is a list of hardware to build sensors.
All the items are sold on Ebay or Aliexpress for really low prices.
Usual delivery time is 2-4 weeks depending on your location.

Post your parts that are not yet on the list and I will add them.

If you post links use the short links for ebay : http://cgi.ebay.com/“eBay item number”

Arduino compatible boards

Picture	Component	Quantity	Link	Notes
	Arduino Nano	1pcs	aliexpress / ebay	ebay DIY kit
	Arduino Uno R3	1pcs	aliexpress	-
	Arduino Pro Mini Compatible 3.3V	1pcs	ebay	10 is cheaper aliexpress
	Arduino Pro Mini Compatible 5V	1pcs	aliexpress	10 is cheaper aliexpress
	FTDI USB to TTL Serial Adapter	1pcs	aliexpress	you need it for the arduino pro mini 3.3v/5V to program

ATTINY

Picture	Component	Quantity	Link	Notes
	ATTINY85	5pcs	ebay	Here you can buy 10 pieces ebay

Radios

Picture	Component	Quantity	Link	Notes
	Wireless Transmitter and Receiver Link Kit Module	1pcs	ebay/ebay	-
	Wireless Transmitter 433Mhz	5pcs	ebay	-
	Wireless Door Window Magnet 433MHZ	10pcs	chinamade	!Only sends false command!
	Wireless Weather Station Digital Thermometer Humidity Sensor 433MHz	1pcs	banggood	weather1 protocol
	ESP8266 Serial Port WIFI Wireless Transceiver Module. Support AP,STA,AP+STA modes	1pcs	banggood ebay	Breadboard friendly and more GPIO’s banggood
	Wireless leakage water sensor 433MHZ	1pcs	ebay	-
	nrf24l01 nrf24l01+ wireless module 2.4GHz	10pcs	Aliexpress	-

Regulators

Picture	Component	Quantity	Link	Notes
	DC-DC Step Up Boost Module	1pcs	ebay	-

Batteries and Power

Picture	Component	Quantity	Link	Notes
	Battery Holder 2 X AA	10pcs	ebay	-
	Battery Holder 2 X AAA	10pcs	ebay	-

Cables and Prototyping

Picture	Component	Quantity	Link	Notes
	Double Side Prototype PCB Tinned Universal Breadboard	10pcs	ebay	5x7 cm
	Solderless breadboard	5pcs	ebay	-
	Female-Female 10cm	40pcs	ebay	-
	Male-Female 10cm	40pcs	ebay	-

Temperature and Humidity

Picture	Component	Quantity	Link	Notes
	DS18B20 Waterproof Dallas Temperature Sensors	1pcs	aliexpress	-
	DS18B20 Dallas Temperature Sensors	10pcs	ebay	-
	DHT22 Module	1pcs	aliexpress	-
	DHT11 Module	1pcs	aliexpress	-

Motion

Picture	Component	Quantity	Link	Notes
	Mini PIR Motion Sensor Module	1pcs	ebay	-
	HC-SR501 PIR Motion Sensor Module	5pcs	ebay	-

Displays

Picture	Component	Quantity	Link	Notes
	Blue LCD Display 20x4 characters	1pcs	ebay	-
	Blue LCD Display 20x2 characters	1pcs	ebay	-
	Green LCD Display 20x2 characters	1pcs	aliexpress	-

Relays

CAUTION: Working with high power application is dangerous should only be done by a qualified person.

Picture	Component	Quantity	Link	Notes
	1 Channel Omron SSR	1pcs	ebay	1 channel G3MB-202P Solid State Relay Module 240V 2A Output with Resistive Fuse

Boxes

Picture	Component	Quantity	Link	Notes
	Project boxes	2pcs	ebay	-
	Waterproof boxes	1pcs	ebay	100x68x50mm
	Waterproof boxes	1pcs	ebay	65x58x35mm
	Sensor boxes	5pcs	aliexpress	Some diverend looks : aliexpress aliexpress aliexpress

Sites

Nice TS. I bought these cases. Can be useful for a sensor box.

http://s.click.aliexpress.com/klk/FMjaYnqzB

Or a little different look:
http://s.click.aliexpress.com/klk/F6iqrZvFu
http://s.click.aliexpress.com/klk/jieYJa2b2
http://s.click.aliexpress.com/klk/byvfEqFIi

And the 10pcs attiny85: http://r.ebay.com/GFvupu

Cables:
Female-Female 10cm: http://r.ebay.com/cFR6aX
Male-Female 10cm: http://r.ebay.com/UvJoeg

@sweebee I added them to the list

For cheap door contact http://www.chinamade.com/433mhz-wireless-door-window-magnet-sensor-detector-alarm-home-security-system.html
10 for about 20€ (including shipping)

Wireless Weather Station Digital Thermometer Humidity Sensor
http://www.banggood.com/433MHz-Wireless-Weather-Station-Digital-Thermometer-Humidity-Sensor-p-965559.html
Works fine

@Yves911 said:

For cheap door contact http://www.chinamade.com/433mhz-wireless-door-window-magnet-sensor-detector-alarm-home-security-system.html
10 for about 20€ (including shipping)

@Yves911 said:

Wireless Weather Station Digital Thermometer Humidity Sensor
http://www.banggood.com/433MHz-Wireless-Weather-Station-Digital-Thermometer-Humidity-Sensor-p-965559.html
Works fine

Both in the list

@Sjeff these sensor boxes are 5pcs

@sweebee oops missed that.
i changed it

I have these arduino nano’s: http://r.ebay.com/efXKHe Only difference is that you have to solder it yourself (can be helpful if you want to solder it directly to wires for a small box).

@sweebee just added this one as a DIY Kit

Don’t now if this is the cheapest one, but you need it for the arduino pro mini 3.3v/5V to program: http://cgi.ebay.com/?ViewItem&item=321149890961

And for the 3.3v Battery projects you can drain you battery even more down with a 1-3.3v step up converter: http://cgi.ebay.com/?ViewItem&item=171569922743

@sweebee said:

Don’t now if this is the cheapest one, but you need it for the arduino pro mini 3.3v/5V to program: http://cgi.ebay.com/?ViewItem&item=321149890961

And for the 3.3v Battery projects you can drain you battery even more down with a 1-3.3v step up converter: http://cgi.ebay.com/?ViewItem&item=171569922743

found a cheaper one to program the arduino pro mini and added the dc-dc

shorter ebay links: http://cgi.ebay.com/YOURARTICLENUMBER
for example: http://cgi.ebay.com/130977189883
just for your info

@demlak Thanks for the info i will change it tomorrow 👍

Just updated theTS with some new parts and websites

I will add the pictures tonight.

Hey guys - especially the German ones

Just discovered this offer here at ebay : Raspberry Pi 2 for 35 Euro
I already ordered one :D
it’s a limited time auction, so only 17 hours left from now on …

for me this is an acceptable price/offer. most of the vendors sell this for prices of 40 Euro and above or you need to pay high shipping costs.

edit : ebay power auction has ended but still for 35 euro available

I bought the Pi at pollin.de with a free shipping voucher 😄
At all ~ 38euro.
my z-wave devices i bought at cyberport.de.

Arduino Pro Mini Compatible 3.3V aliexpress link is dead

2 esp8266
http://www.banggood.com/ESP8266-Remote-Serial-Port-WIFI-Transceiver-Wireless-Module-p-947259.html
http://www.banggood.com/ESP8266-ESP-201-Remote-Serial-Port-WIFI-Transceiver-Wireless-Module-p-964288.html

The second one is breadboard friendly and offer more GPIOs

ESP8266 01 for appr. 2.60 Euro from ebay : http://www.ebay.de/itm/ESP8266-Serielle-WIFI-Wireless-Transceiver-Module-Support-AP-STA-AP-STA-Modus-/151623168158