Comments on: Cheap wireless for microcontrollers

By: Jun

Jun — Mon, 20 Sep 2010 10:28:22 +0000

ok.. here the question if i build a wireless for microcontroller. and i need to have many receiver. can the controller send to many unique receiver?

By: Manny

Manny — Tue, 04 May 2010 20:47:23 +0000

I attached the output from a Parallax PIR(http://www.parallax.com/dl/docs/prod/audiovis/pirsensor-v1.2.pdf)into the transmitter..and the receiver to my Arduino. I’m basically trying to create a wireless motion sensor. The PIR goes high if triggered then sends the signal through the transmitter…arduino receives it and does something.A basic HIGH OR LOW scenario. I’m having a problems..it seems the signal won’t transmit right…any advice.

By: Andrew

Andrew — Fri, 11 Sep 2009 20:40:31 +0000

I’m just getting started with Arduino and wireless communications and found this extremely helpful. This may be old news to everyone else, but I hadn’t heard of these and would never have thought to use them if I saw them on SparkFun. It’s sad to see all the negative comments, because this is great information. I’d love to see more cheap or simple alternatives to expensive or overkill electronics. I was going to buy some XBees to play with if not for this article. For less than the price of one XBee module I can make a pair of transceivers from these.

By: jean

jean — Thu, 03 Sep 2009 12:49:26 +0000

…i think that the new is not the devices theirself, but the price…i’ve never seen rf devices that low cost…and i bought a couple. But please, don’t call ‘em “new” devices…

By: Leigh

Leigh — Wed, 02 Sep 2009 05:31:46 +0000

Here is a project I did for the SF Bay Area Maker Faire using these and the Picaxe 08m.

http://wa5znu.org/2009/05/marauders-map/

By: uC

uC — Wed, 02 Sep 2009 01:38:54 +0000

Cheaper version being used:

http://drvernacula.topcities.com/400_metre.htm

If you follow the links to the manufacture they seem to be between $2-3 each depending on quantity

He is using them for some outdoor wireless mesh project. Interesting site.

By: MRE

MRE — Tue, 01 Sep 2009 09:28:48 +0000

you are kidding right?!? right??!?!?!
These things have been around for *centuries* (albeit in larger scales).

this particular form of module is as LEAST 10 years old! They were around *long* before xbee, zigbee, bluetooth, and even wireless ethernet.

Wow. Ive never been outright offensive to had itself. but seriously; take the diapers off.

By: bolke

bolke — Tue, 01 Sep 2009 00:56:48 +0000

http://www.mihaigalos.ro/work/Embedded/Advanced/rf_to_uart/readOn.html

hoperf modules used as a uart channel.

By: Rob

Rob — Mon, 31 Aug 2009 22:31:06 +0000

I played with modules like these a few years ago and quite frankly I’d rather just spend some more money on a couple of Xbees or the equiv and avoid the headaches. All the error checking, noise and general quirkiness of these things is a pain in the ass.

By: erm_ok

erm_ok — Mon, 31 Aug 2009 22:29:39 +0000

Tired of adding several hundred feet of cable to parts of your arduino project to alter resistance? No more!! This link shows you a new devide I discovered called a ‘resistor’.

Now you can bring your arduino projects to life in a circuit board format without lugging the spools of cable alongside!

By: uC

uC — Mon, 31 Aug 2009 20:44:24 +0000

@darkore, et al

Any pricing/ 3rd party reviews of hoperf’s stuff? Cheap short range tx/rx modules or all in one transceivers are always handy for little projects.

These should be available for pennies in quantities of 50+… no?

By: Franklyn

Franklyn — Mon, 31 Aug 2009 20:20:09 +0000

The link to hobby robotics is wrong, you accidentally linked to digi twice. no biggie.

By: Sparkford

Sparkford — Mon, 31 Aug 2009 17:04:56 +0000

spectrum space is regulated not only by frequency and power, but by modulation modes and duty cycle.

I strongly suspect that using these modules in the manner described is illegal. Check section 15 of the fcc rules.

in case you are curious, penalties can be severe. the following is from a recent fcc ruling against someone:

“Violations of the Communications Act or of the Commission’s Rules may subject the violator to monetary fines not to exceed $11,000 for each violation or each day of a continuing violation,
seizure of equipment through in rem forfeiture action and criminal sanctions including imprisonment.”

By: Jef

Jef — Mon, 31 Aug 2009 17:03:15 +0000

I have used this modules too but they aren’t really reliable.

For cheap and intelligent RF transceivers i use the Staronic RF modules which i bought on the dutch site http://www.samenkopen.net

They have also started a EBAY shop a few days ago http://stores.shop.ebay.com/Staronic-Electronics

By: ribblem

ribblem — Mon, 31 Aug 2009 16:57:06 +0000

wooqdeus, I’m not sure if you’re joking or not, but the answer is yes. You can use a pringle can (or a small parabolic dish) to increase the range of these devices just like any other common EM based signals.