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Forum Index : Microcontroller and PC projects : Need long range 433 MHz Modul
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| plasma Guru  Joined: 08/04/2012 Location: GermanyPosts: 437 |
For a new project i searching for a Modul with Easy connection and up to 300 m in an open Range. Can anyone say what is the best for me and micromite ? Thx |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9066 |
I use the Sunray RF modules - moderately priced, but you can get some juicy ones up to 1W of output power, onboard TTL and RS232 interfaces etc. Well worth a look. PLEASE NOTE: It is your responibility to check that any module you use, does not break the law with respect to output power..... Sunray 1022 modules(50-100mW) Sunray 1028 modules(500mW) I have tested the half-watt one, and it is good for about 3kM, even in built-up areas, with roof-aerials. I used compliant frequencies for my testing, but this was not in the 433MHz band, which is limited to 25mW here in New Zealand anyway. Smoke makes things work. When the smoke gets out, it stops! |
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OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 910 |
I have been using the Maxon SD-125 units for some years. Have currently interfaced them into the micromite. Plenty of power and range but they are pricy. www.maxon.com.au |
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| Goeytex Regular Member  Joined: 12/05/2014 Location: United StatesPosts: 74 |
If you can program via SPI (SHIFT) then a "front end" type module such as the HOPE RFM22B or D0RJI DRF4432F20-043S are good. These have the same RFIC and can use the same code and will do the job quite well. But the register settings can be tricky and there is a considerable learning curve. One of these is now orbiting the earth in the $50 SAT and communicating from orbit to earth effectively. Cost about $6 each ($12 pair) If you want to use TTL Serial commands to control the RF module then you will need a serial enabled RF module. These have an 8-bit MCU on them that configures the RFIC and translates serial commands to commands that the RFIC can understand. The most popular if this type now being sold on EBAY are based upon the CC1100 or CC1101 modules, which includes one called HC-12. These are cheap and effective up to ~200 - 400 meters (Line of sight) with the right settings and antenna. But with a TX output of only 10dBm, it may be a stretch to get 300 meters under less than ideal conditions. Make sure the module has a UART!. Some do not and are SPI only A better but somewhat more expensive option that I can personally vouch for are the DORJI DRF4432D20I-043L Modules. A Pair of these will cost about $35.00 on Ebay but include a good antenna and shielding. This is a real bargain, for what you get. I can get a range of > 1km (LOS) with the power turned all the way up to 20dBm. D0RJI also sells the excellent DRF4463D20-043A2. This is based upon the SI4463 and will have a bit more range because of slightly better receiver sensitivity. Cost is about $34.00 (per pair) with free shipping (EBAY). What you don't want are the cheap $2 ASK Modules. Most of these can barely get 50 to 75 feet. Note: A pretty good rule of thumb is that for 300 meters @ 433MHz you need >= +10dBm TX output with FSK or GFSK modulation and a data rate of < = 1200 bps. The higher the data rate the more power you need to get the same range. 13dBm seems to work very well up to about 500 - 1Km under IDEAL conditions. ( no obstructions) and good antennas. |
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| PicFan Senior Member  Joined: 18/03/2014 Location: AustriaPosts: 133 |
Look this: 433MHz I have tested up to 500m, works fine. |
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| Goeytex Regular Member Joined: 12/05/2014 Location: United StatesPosts: 74 |
Another good one is the HOPE HM-TRP. http://www.ebay.com/itm/HM-TRP-Wireless-Transceiver-433Mhz-H opeRF-w-simple-UART-Program-Interface-/181249453488 No antenna, so just solder on a 6.8 inch wire (1/4 wavelength) to the antenna pin. This is the exact module used above by PicFan, but without the Grove breakout board. Cost about $11.00 each. ($22 per pair) |
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1804 |
For anyone interested there was an article in Nov. 2012 Silicon Chip in the 'Circuit Notebook' pages. It used Dorji modules and a mini maximite as the master and could control up to 10 remote slaves in either toggle mode or timer mode using a Sony remote control. The slaves used Picaxe 08M2s. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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