Attention: RC-CAM.com will be closing down August 2021.
The RC-Cam.com forum was the very first online community dedicated to the advancement of wireless video cameras on radio controlled (R/C) models. This is now called "FPV" (First Person View). We are proud of the contributions that our members have made to the FPV hobby.We've seen significant changes over the last twenty years. Initially there were a lot of eager R/C hobbyist that built their own video systems. Allowing these creative individuals to share their work was the purpose of this site. Now the FPV market is flooded with low cost systems; Sadly DiY FPV video projects are now rarely discussed.
RC-CAM.com (main site and forum) will be closing down August 2021. This is being announced now (March 2021) so that everyone has time to download any information that is important to them. After the site is shutdown the information will no longer be available here.
We appreciate every member's involvement with advancing the FPV hobby. It is indeed sad to say goodbye to all our online friends. Be safe and stay healthy.
Cyb
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Everything posted by Cyb
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Hi Terry, No I don't have any patch antenna. The strange thing is that it works until someone else turns on its radio (... or this is what I think but it is maybe not related...).I'll make some more tests then although I don't really know what to try !
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Hi, Just one question : Does some 2.4ghz radio can interfere with 5.8ghz video ? When I'm flying alone at my club, everything's OK, image is good, range too. When other pilots are flying at the same time as me, I got whites lines on the screen and image looks bad even at < 100 meter range. They have branded radio like Spektrum and Futaba so the RF range is well defined and should not interfere with 5.8ghz video right ? I myself am flying with a Futaba and a Spektrum and I hadn't these whites lines... Any reason to explain this ?
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Hello, I have one more question. Can the Airwave 5.8GHz A/V Receiver with Patch Antenna receiver be powered using a 3S LiPo? Thank you Cyb
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Order placed!
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Thank you RC-CAM, I understand it. I have a couple of 7805 Vreg, I guess they can also be use to get the 5V for the cam ? Otherwise I also have some ESC that I don't use anymore, I guess it'll be the best choice. Regards,
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I am currently flying with a 2.4ghz TX from Aeropix on which there's a 5V output (out of a 7805 I think). You mean that I can take another Motor controler to get the 5v for the camera ?
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The problem is I already have a KX131 5V camera. How does Terry power it ?
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OK thank you. So it's better to go with the receiver with patch antenna. One more question : I see in the TX datasheet that there's a +5v output on the board, can it be used to power a camera ?
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Hi, I am interested in this package! Would it be possible to provide an antenna for the simple Rx with SMA ? Do you know if this receiver can easily fit on the headband of the fatshark goggle ? Cyb
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Hey une fois, merci bien pour ton lien... I built your little circuit, and I get the LED flashing when it receives a ppm signal from my Futaba radio. Now I'm wondering one thing : Can I feed the PIC output (5v) directly to the trainer port of my Spektrum radio ? I cannot find any specification about trainer port input voltage... Loïc
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Thank you. But is there any DIY way of doing it ? I'm still in the process of learning PIC programming and I though it would be a great small project
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Hi everybody, I am trying to use my Futaba FX18 as a trainer, with a Spektrum Dx7 as master. It works but channel assignment from one brand to another is not the same. Is it possible to reorder correctly the PPM signal ? I have a couple of PIC (12C508). Would it be easily done ? Or maybe one of you already done it ? Can you give me some hints about doing ? Thank you, Loïc
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Hi, I've started using Eagle to make the schematic and the board. My aim is to make a little PCB for this altimeter and thus, learn the process of board making. My problem is I don't know if the PCB eagle generate is correct. Can you have a little look at it and eventually tell me the mistakes I made ? I also think I messed up something with vdd/vss/vdd/gnd in the schematic. In eagle, do you use the auto route feature? If I use it, can I be sure that the board connections match the schematics connection ? I attached the board and the schematic file. altimeter.rar
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Hi, I've rebuild the circuit, changing some resistors value and I still have a drift but less than the previous version. Anyway I think this will be ok for now. This project was fun at beginning but now I want to move to something else
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With op amp removed , I also get the drift curve. I made another test , I connected a battery to the op amp input , instead of the MPX pressure sensor. I also get a drif. So resistors and mpx may not cause the problem . I can be either the 7805 or the ADC.
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Hehe Texts on the graphs are not correct. They came from an excel file I've downloaded somewhere and I did not change them . 1200 must be /2 ==> 600 seconds.
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Anyway I'll try changing resistors. Can you give me a part name I can use as a 5V precision VRef ?
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Hi Mr-cam, I've read the datasheet and it seems the ref from max187 cannot source enough current to power the mpx : The output can be used as a reference voltage source for other com- ponents and can source up to 0.6mA. Decouple REF with a 4.7µF capacitor.
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Yes, the 2 first graphs were taken in a very little time , 5 min or so. I made another test , I connected the MPX directly to the ADC, without going through the op. amp. In this situation , no resistors were involved. But I also get a drift curve. I looked in the Max187 datasheet and I saw that it must be used in temperation range within 0 to 70 degrees. So this might be the problem.
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Here's a pic :
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Thank for the tip , I'll try. Concerning resistors , I don't know which type they are. They are standard resistors I bought from an electronic shop... How can I know if they are carbon or metal ?
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And how can I know which component(s) is causing the problem ?
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Hi, I am now sure that the problem is temperature : The altimeter was at ambient temperature the whole day. I pluged it indoor, then I diirectly put it on a table outdoor. The graph shows a curve, so I think this is the drift caused by the temperature difference. Maybe I should have left it more time outdoor and we would have see a curve folowwing by an horizontal line ...
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I don't have any way to compensate the temp drift. I use classics components . Anyway how can I use the technic you're describing ? Here's the graph when I log data on a table , without moving and temp change. Temperature might be the problem ...
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Yes it is : MPX4115 Features * 1.5% Maximum Error over 0° to 85°C * Ideally suited for Microprocessor or Microcontroller–Based Systems * Temperature Compensated from –40° to +125°C * Durable Epoxy Unibody Element or Surface Mount Package