Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

How to design a long range(500m-1km) remote control?

Status
Not open for further replies.

pradeep_k_b

Full Member level 3
Joined
Dec 21, 2011
Messages
160
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,306
Location
Nilambur, India
Activity points
2,504
Hi.I am trying to design a long range remote control,I need an operating range of at least 500m.This remote control is using to operate a wild animal repellent and I want to turn ON and OFF the the device from my home.And the distance between home and field is around 550m,so the range is really important

I have already tried different methods like 433Mhz RF module and 2.4Ghz NRF24l01 module,but didn't get enough operation range.With 433Mhz I got around 100+m but nrf24l01 only 6-15m

I greatly appreciate if you can suggest some solutions

Thank you
 

SunnySkyguy

Advanced Member level 5
Joined
Sep 26, 2007
Messages
6,743
Helped
1,675
Reputation
3,348
Reaction score
1,643
Trophy points
1,413
Location
Richmond Hill, ON, Canada
Activity points
50,729
Path loss increases with √f, so try 21MHz or similar LF license free radio channel. >100 mW with line of sight to target or more mW and suitable error detection.
 

pradeep_k_b

Full Member level 3
Joined
Dec 21, 2011
Messages
160
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,306
Location
Nilambur, India
Activity points
2,504

SunnySkyguy

Advanced Member level 5
Joined
Sep 26, 2007
Messages
6,743
Helped
1,675
Reputation
3,348
Reaction score
1,643
Trophy points
1,413
Location
Richmond Hill, ON, Canada
Activity points
50,729
Not very reliable.. Roof top. no interference, no rain, high gain antenna or perfectly wound helix with experience and SA to tweak.
 

ravindragudi

Full Member level 3
Joined
Jan 20, 2010
Messages
172
Helped
51
Reputation
102
Reaction score
51
Trophy points
1,308
Activity points
2,334
On the frequency of communication selection, you have to review and select it carefully as there are restrictions on its use. Refer to National Frequency Allocation Plan of GoI. pages 66 and 153.
http://www.wpc.dot.gov.in/Docfiles/National Frequency Allocation Plan-2011.pdf

Having said that, to meet your ~1km range, you may have to choose an RF module with max allowed Tx power may be 10dBm or so for that frequency and directional antenna to increase the gain in given direction and possible repeaters in between if required. A combination of these methods....
 

Audioguru

Advanced Member level 5
Joined
Jan 19, 2008
Messages
9,093
Helped
2,112
Reputation
4,218
Reaction score
1,938
Trophy points
1,393
Location
Toronto area of Canada
Activity points
57,099
My 2.4GHz radio controls for model airplanes go reliably farther than I can see. They do not cost much and are on sale for lower prices each time a new feature is added. The antennas are small and are not directional but work best when parallel with nothing in between.
 

pradeep_k_b

Full Member level 3
Joined
Dec 21, 2011
Messages
160
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,306
Location
Nilambur, India
Activity points
2,504
@ravindragudi ..I know about this..but its for a rural area,so I don't think it will not interfere any other systems...actually its a place near to the forest that is why I am trying to design a system like this

- - - Updated - - -

@Audioguru ..what type RF modules are you used for this?..Have you designed a remote control from scratch?I think for model airplanes the ready made radio systems are using..right?
 

godfreyl

Advanced Member level 5
Joined
Apr 18, 2012
Messages
1,981
Helped
632
Reputation
1,266
Reaction score
624
Trophy points
1,393
Activity points
12,776
Another approach would be to use a cellphone link or GSM modem.
 

pradeep_k_b

Full Member level 3
Joined
Dec 21, 2011
Messages
160
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,306
Location
Nilambur, India
Activity points
2,504
@godfreyl..That wont work.So time I need to use multiple numbers of repellent devices in different parts of the field...
 

jiripolivka

Advanced Member level 5
Joined
May 21, 2010
Messages
2,832
Helped
831
Reputation
1,660
Reaction score
802
Trophy points
1,393
Location
Santa Barbara
Activity points
22,012
@godfreyl..That wont work.So time I need to use multiple numbers of repellent devices in different parts of the field...
I think what you need is to learn how to design and adjust a good communication system. You may use any ready-made "module" at any frequency from 27 through 2.4 GHz. You must calculate the propagation loss from transmitter to receiver antenna over your distance at a chosen frequency, then knowing the transmitter power and receiver noise figure, you can obtain a needed antenna gain for a reliable function.
The best way to make a good system is then using directional antennas. Yagis are easiest to make and use, and a six to ten element Yagi offers a gain close to 10 dB. With a power of +10 dBm your system should reliably work over several kilometers. But you need a line-of-sight for frequencies higher than 430 MHz. Using the RC model frequency of 27 MHz gives an extended range with only quarter-wave monopoles as antennas.

- - - Updated - - -

Also I remember using a pair of toy "walkie-talkies" sold for less than $10. They operate at 430 MHz and have a line-of-sight range of more than one kilometer. If you add a pair of Yagis, you can have a good system for a low cost. Only remember to use fresh batteries.
 

Audioguru

Advanced Member level 5
Joined
Jan 19, 2008
Messages
9,093
Helped
2,112
Reputation
4,218
Reaction score
1,938
Trophy points
1,393
Location
Toronto area of Canada
Activity points
57,099
I need to use multiple numbers of repellent devices in different parts of the field...
The 2.4GHz radio controls for model airplanes I talked about automatically selects vacant channels (spread spectrum technology) and can have up to 40 operating at the same time.
 
Last edited by a moderator:

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top