FPV (First Individual View) is one factor that excites virtually each RC hobbyist, whether or not a newbie or veteran. I belong to the previous class, and therefore determined to discover the FPV scene with out burning a gap within the pocket.
With that got here choosing a pleasant and reasonably priced 5.8GHz AV receiver. I did my analysis throughout a number of on-line shops and boards and realized that there are means too many receivers available in the market starting from as little as $10 and all the way in which upto a few hundred . The $10 ones, in fact, received my curiosity. It was a Boscam RX5808 eight channel module.
Nonetheless, there was loads of DIY-ing wanted to get it working which included soldering DIP switches, antenna jack, shopping for an antenna, energy provide port, video out jack, and many others. This was positively a waste of time for one thing that solely supported eight channels (though there are hacks to unlock all of the 40 channels).
After which I got here throughout the Eachine RC832 receiver (additionally from Boscam) which is bought by totally different OEMs like Eachine, Skyzone, and many others. This one has all the failings of the RX5808 ironed out. The Eachine receiver helps solely 32 channel whereas different producers have unlocked it to assist 40 channels together with racebands.
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Oh, and it solely prices $15! So I ordered a type of receivers and right this moment we will likely be doing the unboxing and teardown of the identical. So lets get began!
Eachine RC832 FPV Receiver Unboxing
The Eachine RC832 is available in a pleasant little field with a transparent sticker masking the 32 channel assist because it has been unlocked to do 40. The again of the packaging has the main points of all of the channels and frequency group out there on the receiver.
Sliding open the field, we’re greeted by the RC832 itself. Hiding beneath it are all of the three equipment that you’d have to get began – 1 x 5.8GHz Antenna, 1x 2.5mm male to composite audio/video cable, DC enter cable with JST connector. You will have to energy the receiver with a 12V DC supply that can ship at the very least zero.3A present.
The Eachine RC832 has an all-metal physique which ought to assist with warmth dissipation. It’s pretty simple to get began with and management it because it solely has two buttons to leap between frequency teams 1,2,Three,four and 5 with every group having eight channels.
Group 5 consists of the Raceband channels. A vivid pink 2 digit seven-segment show reveals the frequency group and channels within the order fr-ch. The highest fringe of the receiver consists of the usual SMA antenna jack. On the underside aspect there exists the 12Volt DC enter port accompanied by two AV out ports which can be utilized for simultaneous FPViewing from one port and recording on the opposite.
Since I don’t have Vtx at hand at the moment, I’ll save the testing of this receiver for a future publish. Now, that the unboxing is finished, lets get our fingers soiled and begin with the tear down of the receiver.
Eachine RC832 FPV Receiver Teardown
The metallic shell of the receiver is held in place by 4 normal Phillips screws on the highest and backside edges. Unscrewing them and unthreading the nut that holds the SMA jack in place offers us entry to the internals of this receiver.
As soon as the shell is eliminated, we’re left with a single PCB that has all of the parts embedded in place. The rear of the PCB is totally unused.
The oblong metal on the appropriate prime is the core of this receiver, which is Boscam’s RC832 module. The metal casing helps it with thermal dissipation and has loads of SMD parts hiding beneath it. Since this can be a 40ch receiver, there’s not a lot left to mod in there aside from hacking it with a microcontroller to tune for frequencies mechanically. We’ll save that for an additional day since I don’t wish to wreck this earlier than even testing with a Vtx.
The strains from 12V port go straight to a chip labeled as 78M05LGI. This can be a 5V constructive voltage regulator which converts the 12V provide into 5V. A few capacitors and resistors be certain that the regulation is clean. It additionally limits present drawing in to a most of zero.5A to stop additional injury in case of a brief.
Proper beneath the seven section show, lies one other chip labeled as 74HC164D. Though Google wasn’t of a lot assist, however since its pins have been straight involved with resistors whose different ends have been soldered to the show, its simple to guess that this in all probability is a seven section driver IC which converts BCD or Hex into seven-segment comprehensible sign.
On the left aspect of the seven section show is one other IC which surprisingly has its labels sanded off and lined with a layer of laborious glue. Most likely the producers didn’t need us to know extra about it?
Nonetheless, a wild guess would recommend that that is some form of an interfacing chip between Boscam’s RC832 module and the microcontroller module which we’re going to see subsequent.
The final piece of this teardown puzzle ends with the ATMEL168 microcontroller. This tiny piece of silicon is accountable for registering the button presses right into a Three-bit excessive/low sign to toggle between eight channels of every frequency group. It additionally toggles between the frequency teams and even sends indicators to the seven section show to output the appropriate knowledge to the consumer.
Keep tuned for the working of this receiver and doubtless some future hacks.