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R/C Controller for Retractable Landing Gear</font></font></p>
<p align="left"><font face="Verdana">How it work ?</font></p>
<p align="left"><font face="Verdana">A normal control signal from receiver is a
1.5 mS (+- 0.5mS) plus pulse, repeat every 20 mS (variable), it's PWM. The servo
rotate and stop at position correspond to the width. e.g. 1.0 mS pluse will put
the servo rotate to right limit, 2.0 mS to left limit.</font></p>
<p align="center"><img border="0" src="LG1.jpg" width="476" height="160"></p>
<p align="left"><font face="Verdana">1. This microchip read the pulse, measure
it's width, if less than 0.8 mS, treat it as noise and ignored, if between 0.8-
1.3 mS as low level, if large than 1.7mS as high level. (see MAIN section
in the ASM code file)</font></p>
<p align="left"><font face="Verdana">2. A input level compare with the current
status of servo, if input is low and servo at low side, next step is checking if
High pass counter (HP) been decrease to zero..... (see HIGH & LOW section).
After more than (T4) 9 same level pulses been detected, which pulses opposite to
current status, will invert the status. this make sure possibility of error
action is very low .</font></p>
<p align="left"><font face="Verdana">3. The most interesting part of the program
is section OUTPUT. Use T1, TMR2 (timer 2), and a 5uS loop to make a 1.0 mS high
level of output, after that use TMR1, which value between 0 - 200 (T2) to make
additional high level width, so the real output will be high pulse between 1-2
mS. When the status invert (servo rotate) , the TMR1 increase/decrease one,
every time it been check, and it's about 20 mS (decide by your remote
controller, which compose the PWMs), so it take about 4 seconds from 0 <->
200. </font></p>
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