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Author Topic: Radio Communication with Robots  (Read 2548 times)

MEgg

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Radio Communication with Robots
« on: April 20, 2017, 05:07:41 PM »
Did anybody try these radio comm sets:
http://ardupilot.org/copter/docs/common-sik-telemetry-radio.html
or
http://ardupilot.org/copter/docs/common-rfd900.html#common-rfd900
?
Similar : https://hobbyking.com/en_us/micro-hkpilot-telemetry-radio-module-with-on-screen-display-osd-unit-915mhz.html

The first one says "Transparent serial link" and this sounds as if one can TX and RX arbitrary data via this serial link.
Any experience with these sets?
1st project: Dagu 5 Rover + Dagu - 4 Channel DC Motor + Red Back Spider robot controller + Raspberry B+
Chassis + wheels: https://picload.org/image/dggroior/20150831_028.jpg
current: https://www.keepandshare.com/userpics/m/a/r/k/usegg/2016-04/sb/img_3480-79682018.jpg

mogul

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Re: Radio Communication with Robots
« Reply #1 on: April 21, 2017, 03:58:27 PM »
Not tried these particular radios. Be aware of regulations, for instance I dont think you are allowed to hammer the ISM bands with +30dB here in Europe.

Also, these modules are usually half duplex, they cant transmit and receive at the same time.

What are you  going to use them for? If you are aiming for long range, very little data and low power let me suggest you take a look at LoRa.


MEgg

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Re: Radio Communication with Robots
« Reply #2 on: April 21, 2017, 05:44:22 PM »
Not tried these particular radios. Be aware of regulations, for instance I dont think you are allowed to hammer the ISM bands with +30dB here in Europe.

Also, these modules are usually half duplex, they cant transmit and receive at the same time.

What are you  going to use them for? If you are aiming for long range, very little data and low power let me suggest you take a look at LoRa.

Thx Mogul.
I know that regulations are hard in Europe.

I was using WLAN for communication with robot but I am also looking for alternatives with a longer range, same data amount and less power.
Do you have a link for that LoRa?
1st project: Dagu 5 Rover + Dagu - 4 Channel DC Motor + Red Back Spider robot controller + Raspberry B+
Chassis + wheels: https://picload.org/image/dggroior/20150831_028.jpg
current: https://www.keepandshare.com/userpics/m/a/r/k/usegg/2016-04/sb/img_3480-79682018.jpg

mogul

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Re: Radio Communication with Robots
« Reply #3 on: April 22, 2017, 01:26:02 AM »
What are you  going to use them for?
I was using WLAN for communication with robot but I am also looking for alternatives with a longer range, same data amount and less power.
Do you have a link for that LoRa?

Hmm, sounds like remote control and tele-metrics for a moving robot, not that LoRa is ideal for.

Perhaps something like these is what you are looking for. Bajdi have used similar modules for a project or two, think he got a fair range with them.


Bajdi

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Re: Radio Communication with Robots
« Reply #4 on: April 22, 2017, 12:36:17 PM »
MEgg, I've used the nRF24L01 modules a lot to remote control a robot. They are well supported by Arduino and easy to program. They use the SPI bus and run on 3.3V but the signals can handle 5V so easy to hookup to an Arduino.
They are much faster (less latency) then wifi modules so much better suited for 'instant' remote control. Some cheap computer mouses use them... To get decent range you need the modules with a preamp and amp. The smaller modules have very low range.

 

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