read ADC???....then use dead ACD to work it out.
Within the same band, perhaps (without the radio being retuned, you can introduce unwanted harmonics which can interfere with others. Within a close band, like 35-40 or 72-75 a qualified "maybe," but even more likely to be dangerous. Usig a 35 MHz radio with 75MHZ crystals - really unlikely. Plus, is 72/75 MHz (US frequencies for R/C) legal in UK> I had understood not.I mean so that I can change both crystals to get a matching pair that aren't in air frequency.
Kind of. They visually look at the turrets and aim them by shifting them clockwise or counter-clockwise with a geared motor hooked to an ESC (since you are rotating your turret 360+ degrees, I am suspecting you are using a hacked servo, basically the same thing - no absolute/proportional positioning). The trick is in getting the cannon elevation geared down enough as to make the elevation slow enough to handle with on-off.Sorry, don't follow. "visually on the fly".
D'you just mean manually.
When it comes to R/C, safety and lack of interference are important as already thoroughly discussed. No only for your equipment, which may represent thousands of hours and tens of thousands of dollars, but also for innocent bystanders (who can be injured by a plane "shot down" by someone playing around with an air frequency TX over a mile away.read ADC???
Then BB quotes the use of 2.4Ghz for RC use in the UK. My thoughts were…. Why would any one put yet another service in the 23cm band. Is not your high power microwave oven in the kitchen, 2.4 Ghz. high power transmitters in the Amateur Radio Service and wireless routers and modems enough! Oh, cordless phones too!
Doubt you could easily retune a 35MHz to 27MHz. Probably really easy to retune it to 40, as many manufacturers produce them to work on either air or ground band with minimal adjustment in the 35-40 or 72-75 groups. Many manufacturers will let you send them in to their service center for conversion from air to ground or ground to air for free or nominal cost (plus cost of shipping). That is how our Warship Combat guys get their Air Frequency umpteen channel stick radios on ground frequencies (when the manufacturer does not normally sell them on ground frequencies). Again, these are RC questions that are better answered by your local RC groups - there may be tons of inexpensive solutions locally. Or, someone bay have a used one laying about. For what it is worth, Polk Hobbies used to carry a nice 8 channel synthesized (no crystals needed, programmable to any frequency channel) TX in european frequencies for about USD$200.Look's like I'm going to need to buy a new, well everything - hurumph .
So basically, I need to go for 27Mhz?
Could I get someone to retune my Tx for less that a new on costs?
Anyone got any advice for a cheap 5 channel Rx/Tx pair. e.g. what they would look for.
Not being UK myself, not sure - though that is how ground units are advertised there. However, your local RC guys would know. Even your local RC hobby shop.Is 40Mhz legal in the UK as ground frequency?
I own these two.I don't think it would fit. I have 13x20x1mm space to fit it in. I'm hoping to get on from Rick for turret rotation and if I can fit that circuit board in I'll buy a second, but I really doubt it'll fit.
Please report them Alband.Problem is I can't talk to my local till Monday + they were the ones who said "Oh go on, it'll be fine using 35Mhz".
Was the above an answer to post 181?Afraid not, the axis is the wrong way.
It only has to 1mm in certain places, can stretch to about 2mm max at on end.
Aww.Don't think you can do it all on one pin.
Rather than second guess your hardware, here's how it works.
Rx sends out servo position demand. That goes to the gyro. Gyro sends out "corrected" position demand. That goes to the sero. (or ESC in your case).
It is a 'continuous' signal just like any other servo signal. However, the amount of 'correction' varies as the turret moves. If you tried a system like the one using serial data discussed earlier, I think you would have problems with timing.
The tank turn a little bit. The gyro detects it and "corrects' the servo pulses. A little bit later, the "communication" method sends the corrected servo command. Meanwhile, the gyro has not seen an immediate position correction so it adjusts further. By now, the turret has moved to the correct position. then the over-corrected pulses start to arrive. I'm sure you get the picture.
As mentioned earlier, the gyro to servo pulse algorythm is a finely tuned PID loop. By adding a 'comms' delay you may well upset the terms enough to cause oscillation. Turning down the gyro gain will help to prevent that, but if too low, the respsonse will be very 'sloppy'. It would be quicker and easier to try it than it would be to calculate with any level of certainty.
Serin/out commands take 7.5ms. What if the chips were overclocked to 8MHz? They would then only take 3.75ms.- SEROUT pin,N1200,(0)
Measure the time the line is high; that should be 9 bit times. At 1200 baud, a bit time is 833.33uS, x 9 = 7500uS, 7.5mS.
main:
pulsin 1,b0' turret rotation from Rx
pulsout 1,b0' send to turret chip then to gyro
pulsin 2,b1' Gun elevation from Rx
pulsout 2,b1' send to turret chip then to 2nd gyro then servo
pulsin 3,b2' laser from Rx
pulsout 1,b2' send to turret chipwhich converst to a high or low.
pulsin 4,b0' Corrected turret rotation from gyro in turret
pulsout 2,b0' to the ESC for the turret rotation
goto main
Leaving aside the Gyro considerations, due to the tight timings beween pulses, I would personally group all the pulsins together. Then, to multiplex the laser on/off, you could do something like:Answered my own question. You mean somthing like this?
At 4Mhz that all should take less that 20ms. It might need reordering to suit the Rx pulses.Code:main: pulsin 1,b0' turret rotation from Rx pulsout 1,b0' send to turret chip then to gyro pulsin 2,b1' Gun elevation from Rx pulsout 2,b1' send to turret chip then to 2nd gyro then servo pulsin 3,b2' laser from Rx pulsout 1,b2' send to turret chipwhich converst to a high or low. pulsin 4,b0' Corrected turret rotation from gyro in turret pulsout 2,b0' to the ESC for the turret rotation goto main
main:
pulsin 1,b0' turret rotation from Rx
pulsin 2,b1' Gun elevation from Rx
pulsin 3,b2' laser from Rx - assume > 150= "on"
If b2 > 150 'test to see if you want the laser turned on
then pulsout 2, b1+200 'add an offset if laser on
else pulsout 2, b1 'pass elevation without offset if laser off
endif
pulsout 1,b0' send to turret chip then to gyro
pulsout 1,b2' send to turret chip which converst to a high or low.
pulsin 4,b0' Corrected turret rotation from gyro in turret
pulsout 2,b0' to the ESC for the turret rotation
goto main
It is quite big, but http://cgi.ebay.co.uk/3-Axis-low-g-Accelerometer-MMA7260-prototype-PCB_W0QQitemZ250335998152QQcmdZViewItemQQptZUK_BOI_Electrical_Components_Supplies_ET?hash=item250335998152&_trksid=p3286.c0.m14&_trkparms=72:1301|66:2|65:12|39:1|240:1318 is very nice and easy to use.Andrew: what part no. was it that you got; there are a few. Do any of them have a circuit board?
M1A2 Abrams so definitely realistic.
Do you mean for the slip-ring. I've tried it with PCB. I just made some concentric rings but there was no way to get connections to the middle tracks through the board.
The headphone connector is just much more reliable and sturdy.