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hey
im trying to do this
http://www.uoguelph.ca/~antoon/gadgets/servo3.htm
http://www.uoguelph.ca/~antoon/gadgets/servo3.gif
but i faced a problem
i bought all these
IC1 = LM555 Timer R1 = 2K7
R2 = 68K
C2 = 100nF
C3 = 100nF D1 = 1N4148, signal diode
but they dont have this
C1 = 390nF AND P1 = 2K7, potentiometer
the seller told me that they dont sell 390nF AND 2K7, potentiometer
so any one can help me?
So you chose to make that one rather than Alaine version ( http://www.picbasic.co.uk/forum/atta...8&d=1169308729 )
I use RS components here in the UK and they don't list 390nF value. I'm sure for your purpose a 400nf capacitor would suit. Likewise a 5K trim pot could be used, but you may not need to use all the range to get the 1ms - 2ms pulse width.
As this forum is really about Pic programming, why not look at using a PIC to do the job for you. Here's some links I found
http://www.dougrice.plus.com/hp/RCservo/rcservo.htm
(includes HEX code and is simple to build)
http://www.rc-cam.com/servotst.htm
(Hex and documents for download)
http://www.electronics-lab.com/proje...008/index.html
(Asm and schematics)
From the same site as your original servo pulser have a look at this one
http://www.uoguelph.ca/~antoon/gadgets/servo2.htm
It uses more standard values
As does this version
http://www.uoguelph.ca/~antoon/circ/archive/servo1.htm
Another 555 timer based servo tester
http://www.hobbyengineering.com/appServoTester.html
And another
http://hometown.aol.com/hprinzler/9610-03a.gif
I could go on.. but I have other things I need to do. Just type in NE555 Servo tester into any search engine if you want more
Aly,Quote:
Originally Posted by al000y
The total value of the cap must be .82µF ... on the drawing you had 3 possibilities INCLUDING 0.47 // 0.33 µF !!! There's enough room on the pcb to place 2 caps ...
If you use a twin 4.7K pot ( the 2 sections wired in // ) that will fit perfectly.
I use for this design an old 1 channel stick fitted with 4k7 pot ... but here, only 90° of rotation was used ...
Malc ... you begin to look like "Jetpr" ... R = R1*R2/( R1+R2 ) and C1//C2 = C1+C2 sounds sthg for you ???
Alain
hey
first can you give me link for beginner tutorial in electronics
second yestrday i bought all these(in attach pic)
1-68K R
2-100nF
3-330nF (also they have 400nF but they dont have 390nF)
4-NE555P
5-2.7K R
6-IN4148
7-P1 - 2.2K (they dont have 2.7 he said 2.2 is standard)
if i build the project with these it will work fine and generate 1 - 2 ms ~ 50Hz ?
or it will damage my ESC?
just a simple test with 180f452 on microchip proto board
servo connected to port B.7
a quick test - without any additional hardware
fyi
init:
gosub rstml
loop:
LCDOUT $FE, $80, " test for servo "
if code <100 then code = 100
if code >200 then code = 200
if portB.0 = 0 then ' button right
code = 100
pulsout portB.7, code
high portB.0
else
low portB.0
endif
if portA.4 = 0 then ' button left
code = 200
pulsout portB.7, code
high portB.1
else
low portB.1
endif
high portB.2
pause 25
low portB.2
pause 25
goto loop
rstml:
low PORTB.1
low PORTB.2
low PORTB.3
low PORTB.4
low PORTB.5
low PORTA.0
return
Hi, Al
If you had told us electronics was a new land for you ... I had shown you THAT :
http://www.york-electronics.com/
Still time to be reasonnable ... and do not tell me about the cost !!!
Alain
For others:
You REALLY think our friend could achieve an unprogrammed PIC "kit" ... as a simple 555 is a great problem.
do not joke ... please !!!
I thought the guy wanted to build something, rather than purchase a commercial product..
Mind you at $20 it would probably be just as cheap !
Quote:
Originally Posted by malc-c
I know that, Malc ...
but this device really is a value !!! ( I know "Rocky", it's him, for quite a while and his work is worth every $$ ... )
Be sure this device is far off from your "miracle" bass beat filter ... ( LOL !!! )
and as many things could be done with the 555 ...
better to excercise on a blinking light or a standalone kit than taking risks with other stuff involved.
Alain
Don't knock it... by the time I've finished playing with these op-amps I'll be the guru on low pass peak detection filters :D :DQuote:
Originally Posted by Acetronics