Cheapest way to add wifi to a project [duplicate]

Question

I need low power wifi for a not-very-data-intensive application. What modules or chipsets should I look at? Other than low cost and low power, I have no restrictions. The cheaper the better.

This is for a high volume product, so both hobby level (since I can trace it back to an oem module) and oem level suggestions are welcome.

Answer 1

There is a list of suggested wi-if modules in this very closely related question:
ideal-wifi-to-serial-or-spi-bridge

Answer 2

A very cheap way to add WiFi to a project, is to use a WiFi router as WiFi hardware. The router needs to be not-so-new in order to be cheap, and must support

• Serial/USB or JTAG ports on board
• OpenWRT (DD-WRT may work too, but I haven't used DD-WRT for this purpose)

See OpenWRT supported hardware page for information on what hardware is supported (note that DD-WRT supports more hardware). Router firmware already has a web server (for serving and admin page), a linux kernel (usually Busybox), and most everything else you need to have a functional WiFi interface. Since OpenWRT is.. you know.. open, you can do whatever you want on the router side of the equation.

Many routers have USB connectors built in. Others have pads on the PCB that can be soldered to. This provides the router/microcontroller interface.

One solution is to get the router to do most of the interfacing for you (i.e. run a web server / web client, which the router/openWRT does already), and have your microcontroller just respond to get data requests or push data to the router via the serial/JTAG connection.

As an example the D-Link DIR-601 can be found bought for about $5, has a serial port pads (some soldering required) and supports OpenWRT, albeit the flash space is a bit tight. Low power and small form factor this device surely isn't, but you cannot beat the price.

Answer 3

I haven't used this chip myself, but I've looked at the Epcos B30810 series before.

They're about $6 in low quantity, and below $2.50 in large quantities. Digikey has them in stock. Unfortunately, their datasheets are behind a signup form.

I'd also look at the Atheros chips. I think the most recent low-power one is the AR6003. I don't know how much it costs; I suspect you'd have to buy it from Atheros directly. I'd be a little wary of the 0.4 mm spacing on the BGA pads-- below 0.5 mm generally costs extra.

Answer 4

Check the WIZnet WIZ610wi modules. It is not clear from the website but AFAIK they have a normal TCP/IP stack hardwired in addition to the WiFi<->Serial bridge.

EDIT: Unfortunately it seems it does not have a TCP/IP stack for client use. You need to connect to the MII interface with their W5300 (which handles TCP/IP with 8 sockets) or some other MAC to get TCP/IP.

Answer 5

The problem you are going to run into is that the big boys like Marvell and Broadcom will not talk you unless you are someone like Apple. What I have has luck with is someone like Wi2Wi who acts as the bridge to vendors like Marvell.

Answer 6

Try this http://ruggedcircuits.com/html/yellowjacket.html

Features

• 41mm x 31mm
• Microchip MRF24WB0MA WiFi module:
• 2.4 GHz 802.11b/g/n transceiver with built-in PCB antenna, range up to 400m (1300ft)
• FCC certified and WFA certified
• 1 Mbps operation
• infrastructure and ad-hoc network modes
• ATmega328P microcontroller with 16 MHz 0.005% quartz crystal. The microcontroller includes:
  • 32Kbytes FLASH (512 bytes used for bootloader)
  • 2Kbytes SRAM
  • 1Kbyte EEPROM
  • 6 10-bit analog inputs, 3 timers, serial, I2C, and other peripherals

Answer 7

If you only need a few metres range, the Nordic nRF24L01+ chips are cheap and quite easy to use.

Answer 8

Wifi is a pain in the butt, with the TCP/IP stack and all that. You should consider Bluetooth instead. They have RS232->Bluetooth modules...BlueSnap is their name, I think.