Hi

When you do flips or rolls, are you cut throttle to zero when quad is upside down...?

Or it depends slow or fast trick you do?

Hello guys,

I'm a beginner looking to get into the drone racing fpv experience. I've done a lot of research to learn as much as i can before buying parts and start building one. I've looked so far into the FPV systems and i came across the Fat Shark Predator v2 FPV RTF headset system. I read in another article that people recommend having a lipo battery voltage tester on the drone so it makes an alarm when the voltage gets low so you don't hurt your battery. One thing i noticed is that both the FPV and the buzzer use the same battery connector. How can i use both? or does the FPV already indicate the voltage? What do i do? or what do you guys recommend?

How do you disable active braking (damped light) in BlHeli 14.3.0.2 ?

I want to keep OneShot, but disable active braking on some BlHeli Opto ESC's.  CleanFlight only
lets you enable/disable OneShot.

I was told to do this in the BlHeli Suite by going to PWM Frequency / Damped, set it (if not already set) 
to "damped light", and then click on the house icon to the right of "damped light" to turn it off.  When 
I click on the house icon, it changes the PWM Frequency to "High".  Is "high" really the disable setting?

There is also an option in the BlHeli Suite to "Enable PWM Input".  Do I need to disable here?

Thanks!

Hi everyone, I flew FPV for the first time yesterday after only a dozen or so batteries LOS, and I find myself very nervous when flying!
Anyone know any tricks for getting rid of nerves while flying 

Something is wrong with my latest zmr250 build, and I don't know how to explain it.

So I have upgraded it to naze32 FC, littlebee 20a esc and cobra 2206/2100 racing motors, still running 3s batteries at the moment.

My problem is, it will take off and hover for about 3-5 seconds and then it will start rocking and gaining momentum over the next 5 seconds and then boom flips over, I have increased and decreased the PID for my roll as that's the way it is rocking, it then moves to the pitch so I do the same adjust the PID setting for pitch and then it goes back to the roll having issues.

Anyone know why? 

Curious question - on the transmitter, when flying, Do you use thumbs only or pinching between thumb and pointer finger (index finger) to control the sticks?

How does everyone here fly? What about people flying in actual race events? Any difference between them?

Hello!


I like what I see so far content-wise, this will be good and Oscar is one step closer to world domination!

(just to have a first post on my record finally   )

Hi!
First time reading and posting in this forum. 
I like to share with you my first 250 build, the Tarot mini 250. Its probably not the easiest build if your not a master at soldering. My soldering looks a bit scary but it works. ;-)

Weight with all gear and props is 389g and with Lipo 1500mah about 502g.

I have a question on the build that perhaps someone can answer. I use 12A ESCs and what i can read about my motors (EMAX 2204 2300kv) they should not overload the 12A ESCs even with 6/4 props. But i can be misteken, any one who can shed som light on this? :-)

See the images here or/and read the full blog post here.  Building the tarot mini 250 quadcopter

Many people wonder how much current the Micro MinimOSD draws so I am sharing it here.



People have mixed reports on how much current the unit draws: 100mA, 250mA, 500mA. Looks like it depends where you buy from, it appears the manufacture is inconsistent across the board... e.g. hardware variations of cheaper ones are creating different power consumption. There are so many manufacturers pumping these things out now.

Don't solely rely on the spec provided on the product page, it's most likely to be a "copy and paste" from another seller/manufacture. My advice is to do your own testing/measurement just in case. Worst case senario is to assume it draws 0.5A (although IMO this will cause overheat on most of the PDB out there nowadays with linear BEC), and make sure your voltage regulator can handle that.

By the way Some need to add capacitor to the power line, just to keep the OSD turned on during punch-outs. That's because the MAX chip is extremely vulnerable to voltage variations and "dirty" power, the cap smooths that out.

For setting up guide check out my blog post: http://blog.oscarliang.net/minimosd-micr...-pid-rssi/

This is how you start an argument with someone in the hobby, ask them: Is PPM Analogue or Digital Signal?

     

I posted this question on my Facebook group, and there was many different views on this. Here is a summary of the responses.


It's Digital!

Levi W:
Its Pulse Position Modulation, So its a standard logic pulse(3.3 or 5v), the data is just defined by the position of the pulse in reference to the clock cycle. Similar to PWM. Analog is where a signal varys in voltage, Digital only has two states, on and off, Generally 0v and 3.3 or 5v


Adriano D:
Digital, 0 and 1 levels only! It is generated digitally... But, as a "protocol" can be decoded both, digital or analogic way... Omho

Although is time dependent, it uses a "fixed time frame" to code/decode, larger pulses are multiple from this timeframe, so the double time can be interpreted as two high pulses and so on...This is a kind of protocol... But the signal amplitude does not carry any info...is pure digital, also you need a digital decoder or a DAC to use the info transmitted, so its a digital thing...
Basically, circuits operating on a saturation and cut levels (two levels only) are Digital.
I thing the fact that we can use a simple passive circuit as DAC, makes the confusion...


Martijn DK:
PPM is not a continuous transmission signal, but transmitted in a 27ms pulse interval, so i'd say its digital.


Sindre J:
PPM is digital. The signaling is either 0 or 1. (We all know this). I would state that the PROTOCOL is what makes it convey analog values. Ie. the protocol is time-based, where as SBUS uses fixed time base and serial protocol to convey analog values. Both are digital as they can only transmit ones and zeroes, but they have different protocols.


Norbert T:
SBUS and PPM are both digital but ppm is less efficient, because the information is based on how long the signal is on or off, while sbus is transferring the actual number in digital format that given channel has, also has error correction built into the protocol.

John L.:
Digital of course. Because it contains encoded bits.


Ole L.:
It's a digital encoded protocol where you measure digital steps based on a timer. The digital resolution is based on the timer frequency. Nothing analog here !


Forrest A:
PWM is technically a digital encoding, sort of. It was originally created to mimic analog signals, but it is indeed a digital signal. It just only encodes a single value. PPM is a way of conveying multiple PWM signals. It is also digital. It's a bit laggy though



It's Analogue Signal!


David Winstall Podcase (shared by Jack N):

around The 1:11:00 mark best explanation I've had!

Benedikt S:
PPM in this configuration is a series of PWM -analogue spaced pulses in a sequence... so the only digital component in the signal is the synchronisation "bit" that indicates the start of the serial data - but the actual width of the pulses is pure analogue right ?
question is - is the position of the servo encoded in a digital code or not when it goes out as a ppm signal, my answer is not - it's decoded by measuring the time of the pulse - the FC does that and converts it back to a number. time is analogue

if you think about it - this method is way older than the digital radios - this is from the 27Mhz AM time when we had very simple radios with no TTL chips, the pulse width was just made with a oscillator from the position of the gimbals with normal potentiometers - think we still use old pot's - no optical encoders yet?



Rick V:
Digital is not ever-present, relies on a clock or timing signal and does not vary its strength.


Bob R.
The signal of each channel is determined by the width of that channels pulse. All channels are sent together in a compressed pulse. At least that's how I understand it. There is some delay depending on the pulse width which I think is about 27ms for 8 channels. Cleanflight based FC's usually average three pulse before responding so the delay is 27x3. Serial links don't have this dilemma. Also from this link: "A pulse Width Modulation (PWM) Signal is a method for generating an analog signal using a digital source."


Andrew M: 
Just because it uses high and low wave patterns doesn't make it digital smile emoticon Digital would be if it read 1 and 0 and turned that back into something. It uses the width which is varying length so instead of a wave form going up and down the length of the on pulse gets longer and shorter. That is where the analog comes in.


It's Both!

Eric Andreas S
PPM use the means of analog transfer from point A to point B (as all do) where the signal is either 0 (voltage < 1V. Note: Going down to 0V is pretty much impossible due to the heat it would generate) or 1 (voltage > 3,3/5V depending on hardware). This is similar to the way a CPU works where the voltage is an "analog" curve but the interpretation of this curve is digital, i.e. 0 or 1
depending on the sampling of the curve and the value of the curve at that time.


Justin N:
From what i undrstood, Ppm itself isn't anolg or digital, its a means to carry compressed information. Ppm can be used with digital or analog signals so shouldn't it depend on the component generating the signals?


Michael M
Just to clear things up, it is a bit of *both*. PWM is digital in the sense that it is not using a continuous range of voltages to represent its value, but instead pulses between a low voltage and a high one (typically 5V in our receivers). In that regard, it is digital. But, the signal it is transmitting is transmitted as an analog signal, using the time between digital pulses to store the data. This part is definitely analog, because there is an infinite amount of continuous values that can be stored in between the two pulses.