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New Opensource LRS Coming

Posted by Melih Karakelle on November 12, 2010 at 4:49am

Hi Guys,

I just finished the test of our new opensource long range system modules.

This modules 3th generation and i guess i should design 4th generation before publishing them.

I'm using RFM22B radio modules and ATMEGA328P chips on Rx and Tx.
Rx modules including 8 channel servo ports and RS232 for telemetry uplink

Tx modules including PPM-Input for analog servo control and RS232 for Computer based controls and Telemetry downlink.

System range will be around 4-5km.

Firmware Upgradeable over RS232.

Ground tests was unbelievable, it's working around 500 meters into the city (after 20+ concrete building)

I will share the flight test results, sources and schematics soon.

If you have any idea about design and inputs, please share with me before 4th generation's production..

Thanks for reading

Melih

flytron, lrs, long, range

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Comments

Cronselaar January 21, 2011 at 12:39am

Any news on this front? Really interested...
Melih Karakelle December 10, 2010 at 2:20pm

@Ivan

No, first 3 version was only for my personal tests. I2m designing v4 for publishing. It's not including an LCD, you can use your computer for telemetrey ;)
Ivan December 10, 2010 at 11:34am

Melih,

Will v3 boards also be available in your shop? I don't need no LCD screen for telemetry when I have a big screen on my laptop.
Melih Karakelle December 10, 2010 at 10:58am

@Kamu

Our Tx module smaller than all modules(futaba or jr). you can put it into the old modules.
Ed Stewart December 10, 2010 at 8:57am

That's a great question Kamu. I wonder if these will be a DIY module that is to fit inside the transmiter like the Frysky unit or if it could fit inside a module that we could swap out for our regular 2.4Ghz gear and recievers. I'd be willing to trash one of my Turnigy modules for a re-fit to be able to swap it out.
Melih Karakelle December 5, 2010 at 1:59am

@Danstah,

Rx and TX boards same on v3 boards. Because both side using transceiver modules and all boards Tx+Rx ;)
But i'm changing the design for v4, and Rx module including RSSI and SerialPPM outputs. Tx board have a buzzer and less pinouts.
I'm designing a telemetry LCD screen and some sensors now and waiting for sample parts for tests, then i will order the PCBs.
Daniel Morgan December 4, 2010 at 2:26pm

Do you have any pictures of the TX setup. All the pics i see are of the RX side
Lew Payne November 24, 2010 at 3:10pm

I just want to make you aware of these...

- Wide Band 450mW transmitter module
- UHF Multi-Channel transparent data link
- QPX1 2Watt VHF radio link transceiver
- 500mW VHF transceiver module

... any many other toys! Just scroll down this page link.
Andrew Dunlop November 24, 2010 at 1:53pm

@Dunk - another strategy for generating lots of PWM channels in hardware is to use just a single timer, but stagger all the pulses and demultiplex externally. AVRs have a suitable interrupt structure to allow reloading the PWM timer in the gaps between pulses. Using this technique it is possible to get 8 channels of hardware PWM per timer and with very light processor loading. Of course you do need some external hardware, but this is just a single IC.

Andrew.
dunk November 23, 2010 at 6:00am

have you considered using an AVR with more 10bit timers than the ATMEGA328P ?
this would allow you to do servo PWM in hardware leaving the microcontroller with far more time to do other things.

i use a single ATMEGA2561 to run a 2.4GHz module, measure current draw and battery voltage, act as an IMU and still have enough processing time left over for autopilot route planning.
this would not be possible if the AVR was having to do PWM in software.
on the down side, it would increase the cost a little....

i appreciate simple is good and this may be out of the scope of your project,
but versatile is good too.
a more powerful microcontroller that could do servo PWM in hardware and have some spare analogue inputs that could would allow aircraft battery monitoring would allow some powerful functionality.

dunk.