sounds like this might be quite good option now: http://www.seeedstudio.com/depot/WiFi-Serial-Transceiver-Module-w-ESP8266-p= -1994.html?cPath=3D19 Internet is full of comments, tests and experiments using this module. https://www.youtube.com/watch?v=3D7BYdZ_24yg0 On Sun, Sep 28, 2014 at 4:35 AM, Allen Mulvey wrote: > They are transceivers and have a burst mode which automates sending a pac= ket > of up to 32 bytes. It will resend the packet a specified number of times > until an acknowledgment is received. Prefix, checksums, and acknowledgmen= t > are handled automatically in burst mode. > > You can get a datasheet here: > https://www.nordicsemi.com/eng/Products/2.4GHz-RF/nRF24L01P > > You can get some real world information that I posted here: > http://www.libstock.com/projects/view/992/nrf24l01-with-pic16f877a-and-no= -li > braries > > The ones with the eternal antenna have no trouble sending information > several hundred feet through numerous walls. > > Allen > >> -----Original Message----- >> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf > Of >> KPL >> Sent: Saturday, September 27, 2014 4:48 PM >> To: Microcontroller discussion list - Public. >> Subject: Re: [EE] Experimenting with RF modules >> >> These are duplex systems, it seems? What are the real-world specs, >> would they be able to reliably communicate over a distance of about 20 >> meters? >> Speed is not an issue. >> I was going to use cheap routers like TP-Link WR703N, but looks like >> they have very poor wifi coverage. >> >> On Sat, Sep 27, 2014 at 10:49 PM, Allen Mulvey wrote= : >> > nRF24L01+ modules at 2.4 GHZ are getting popular. I have been using th= em > for >> > local telemetry for a number of months. You can get really cheap > rip-offs on >> > eBay to experiment with. I believe you can use the first 83 channels = in > the >> > USA. Logitech uses this band for its wireless keyboards and mice. >> > >> > With rubber antenna: >> > http://www.ebay.com/itm/NRF24L01-PA-LNA-SMA-Antenna-Wireless- >> Transceiver-com >> > munication-module-2-4G-1100m- >> /310651702557?pt=3DLH_DefaultDomain_0&hash=3Ditem48 >> > 5448cd1d >> > >> > With PCB antenna: >> > http://www.ebay.com/itm/10PCS-Arduino-NRF24L01-2-4GHz-Wireless-RF- >> Transceive >> > r-Module-New- >> /170819069271?pt=3DLH_DefaultDomain_0&hash=3Ditem27c59c2557 >> > >> > Allen >> > >> >> -----Original Message----- >> >> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On > Behalf >> > Of >> >> meshka7 >> >> Sent: Saturday, September 27, 2014 12:50 PM >> >> To: piclist@mit.edu >> >> Subject: [EE] Experimenting with RF modules >> >> >> >> Got two RF modules off ebay. One for 433 MHz and another for 915. My >> >> intention was to experiment with RF and remote control. >> >> >> >> Looking into band allocations in the US, I found that these frequenci= es >> > fall >> >> into the amateur bands. Wikipedia shows that 433 is for ISM but only >> > within >> >> Region 1, so I guess I'm left only with 915. >> >> >> >> Am I correct here? What bands do people generally use for experimenti= ng > or >> >> making home made gadgets that use RF and that won't be sold >> commercially? >> >> >> >> Thanks! >> >> >> >> >> >> >> >> -- >> >> View this message in context: >> > http://microcontrollers.2385.n7.nabble.com/EE- >> >> Experimenting-with-RF-modules-tp192230.html >> >> Sent from the MicroControllers - PIC mailing list archive at > Nabble.com. >> >> -- >> >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> >> View/change your membership options at >> >> http://mailman.mit.edu/mailman/listinfo/piclist >> > >> > >> > -- >> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> > View/change your membership options at >> > http://mailman.mit.edu/mailman/listinfo/piclist >> >> >> >> -- >> KPL >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 KPL --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .