9

I am trying to find some sort of wifi adapter for Arduino, it needs to be as small as possible (not a shield) and as cheap as possible.

So far I can only seem to find shields that cost about £10+ but I figured that if you can get a replacement wifi adapter for a laptop for next to nothing that I should be able to get a wifi adapter for Arduino much cheaper than this.

It's possible I just don't know what to search for.

  • The most cost effective solution is likely not to use a literal Arduino, but rather to utilize something else source-compatible which either has wifi built in, or can host a cheap USB wifi dongle. It's not entirely out of the question that such a solution, complete, could cost less than a genuine Arduino UNO - and provide a lot more memory and compute resources to work with. – Chris Stratton May 30 '14 at 21:17
8

Some months have passed since my previous answer and now the ESP8266 based WiFi modules are available.

They get connected to your project serially (3.3V) and are controlled in a modem like way using AT commands.

With a pricing of round about $5 they fit the question better than my previous OpenWrt based answer.

For more information about ESP8266 ask your favorite finding machine or list news with tag ESP8266 at Hackaday.


(Old answer from the pre-ESP8266-days:)

I vote for a small router reflashed with OpenWrt like "TP-Link TL-WR703N".

It is like building an own Yùn with an Arduino of your choice...

The WR703N:

It has Ethernet, 150MBit WiFi, USB and if you want to solder, a serial console and 2 GPIO-Pins which can be turned into I2C.

This sure is not a chip- or stamp-sized solution but often cheaper than the alternatives, more powerfull and extendable.

Search the net with your favourite find'o'bot for "arduino wr703n" and you'll find lots of examples...

  • I've seen it somewhere where they use the I2C for direct connection. This would be slower than direct ethernet, but it reduces costs and size without another ethernet chip – Anonymous Penguin May 29 '14 at 13:57
  • The easiest way to connect an Arduino to a WR703N is serial via USB. – gone May 29 '14 at 14:01
  • The question was asking for "as small as possible, not a shield" and "less than £10". This isn't it. – Federico Fissore May 29 '14 at 18:40
  • @FedericoFissore ... The WR703N in fact is one of the cheapest ways to bring WiFi and Arduino together. It is not my fault if someone dreams to use nonexistent mucht cheaper solutions. – gone May 29 '14 at 22:31
  • Ok... now we have the ESP8266 based modules to add WiFI to your projects... ak your favourite finding machine or hackaday.com/tag/esp8266 ... – gone Oct 26 '14 at 8:51
1

The Roving Networks RN-XV WiFly module (found sold at €30) might be a solution. I've never tried it. It supports 802.11b/g.

0

Texas Instruments CC3000 module 10USD/1000pcs, it does only support connecting to AP, i.e. no AdHoc/AP which is useless for direct using with iPad.

-1

I have published an instructable for a Very Cheap/Simple WiFi Shield for Arduino and microprocessors that plugs into Arduino Uno/Mega has pushbutton webpage configuration for network ssid,password and ip and portNo and acts as a Serial to WiFi bridge, no special Arduino libraries needed.

Cost < US$12.00

The instructions are also available at www.pfod.com.au

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