View source for MeekPE PPM Encoder Board

<span style="color:red">'''(PRELIMINARY)'''</span><br>
MeekPE is a MCUless PPM Encoder.<br>
This small board encode the PPM signal from the R/C receiver servo outputs without using any microcontroller.<br>
Any type of R/C receiver is directly usable without any hardware modification.
[[Image:MeekPE_v1-00_3D_top.png|right|500px|MeekPE v1.00 3D top view ]]

== Hardware Revision History ==

{|border="1"  cellspacing="0" style="text-align:center" cellpadding="6"
!''Version #''!!''Release Date''!!''Release Notes''
|-
|v1.00||in progress...||0603/TSSOP PCB design
|-
|v0.10 (current)||08/2007||0805/SOIC Single layer test PCB design
|-
|v0.00||07/2010||Ugly Prototype
|}

== Features ==

* no MCU => no software
* up to 8 servo encoding inputs
* 25.4 x 15.6mm (1.0 x 0.6")
* ..g (..oz)

== Block Diagram ==

== Prototypes ==
<gallery>
Image:MeekPE v0-00 ugly test.jpg|First ugly test (this is note a joke)
Image:MeekPE v0-10 proto.jpg|Test board 0805/SOIC components
</gallery>

== Pinout ==
[[Image:MeekPE_v1-00_pinout.png|left|600px|MeekPE v1.00 Pinout]]
<br style="clear:both">

{|border="1"  cellspacing="0" style="text-align:center" cellpadding="6"
|+'''RECEIVER'''
!''Pin #''!!width="100"|''Name''!!''Type''!!width="500"|''Description''!!width="100"|''Suggested Color''
|-
|1||GND||PWR||Common ground||style="background:black; color:white"|Black
|-
|2|| +5V||PWR||5V to R/C receiver supply (optional, see connection instructions below)||style="background:Red; color:white"|Red or Orange
|-
|3 to 9||SERVO||IN||From R/C receiver servo output (see connection instructions below)||style="background:Yellow; color:black"|Yellow
|-
|10||LAST SERVO||IN||From R/C receiver servo output. Last channel to be encoded (see connection instructions below)||style="background:White; color:Black"|White
|}
<br>

{|border="1"  cellspacing="0" style="text-align:center" cellpadding="6"
|+'''AUTOPILOT'''
!''Pin #''!!width="100"|''Name''!!''Type''!!width="500"|''Description''!!width="100"|''Suggested Color''
|-
|1||GND||PWR||Common ground||style="background:black; color:white"|Black
|-
|2|| +5V||PWR||5V rail from autopilot (see connection instructions below)||style="background:Red; color:white"|Red or Orange
|-
|3||PPM||OUT||Positive logic PPM output||style="background:Blue; color:white"|Blue
|}

== Connections ==

=== MeekPE to Autopilot ===
Ground, Power ("+5V") and PPM signal must be connected to the autopilot.<br>
Power ("+5V") pin is used to supply the MeekPE board (+3.5V to +16V) and can also supply your receiver. In this case, MeekPE supply voltage must match your R/C receiver power supply voltage (around +5V in general).<br>
You can use a classic Molex 3 pin connector or solder wires directly on board: 3 additional bigger thru-hole pads are provided for this purpose.<br>

=== R/C receiver to MeekPE ===
You can use a classic 0.1" pitch break away header and female/female jumper wires (like SparkFun's [http://www.sparkfun.com/commerce/product_info.php?products_id=8430 PRT-08430]) or cut in half SparkFun's [http://www.sparkfun.com/commerce/product_info.php?products_id=8430 PRT-08430] female/female jumper wires and solder it directly to the MeekPe.
==== Powering the R/C receiver ====
* Ground connection is mandatory (voltage reference between the R/C receiver and the MeekPE encoder)<br>
* Power ("+5V") pin is used only if you decide to supply your receiver with the autopilot. In this case, MeekPE supply voltage must match your R/C receiver power supply voltage (around +5V in general)
==== Servo connections rules ====
To get a correct PPM encoded signal, you must follow some (simple) rules:
* You must know the channel number of the first and the last servo signal you want to encode.
* All servo connection between the first and last channel you want to encode must be connected, even if you don't use it in the autopilot code.
* The last channel number servo signal you want to encode must be connected to the "LAST-SERVO" input pin of the MeekPE encoder. Other servos connections can be in any order because the channel encoding number is given by the transmitter, not by the MeekPE encoder.

===== Servo connection example =====
Ok, finally, servo connection rules are not so simple. So perhaps will it be better understandable with some examples.
* 6 channel receiver, you want to encode Throttle (channel#1), Pitch (channel#2), Roll (channel#3), and Mode Switch (channel#5):
=> connect #1, 2, 3, 4 R/C receiver servo output to any MeekPE servo input and servo R/C receiver servo output #5 on "LAST SERVO" MeekPE input. You can leave #6 unconnected.
* 8 channel receiver, you want to encode channel#2 to channel#5 and  channel#7:
=> connect #2, 3, 4, 5, 6 R/C receiver servo output to any MeekPE servo input and servo R/C receiver servo output #7 on "LAST SERVO" MeekPE input. You can leave #8 unconnected.

== Schematic ==
[[Image:MeekPE_v1-00_schematic.png|left|900px|MeekPE v1.00 Schematic]]
<br style="clear:both">

== PCB ==

=== Gerber & Drill Files ===

== Assembly ==

=== Components Layout ===

=== Bill Of Material ===

== Downloads ==

=== Source files ===
=== Gerber & Drill files ===
=== Assembly files ===