7 Channels PIC16F876 PPM encoder

[weber_alejandro]

Hi guys, this is my almost final version of a 7 Ch PIC16F876 PPM encoder. Is working and have this features:

7 channels
5 analog proportionals (5th from extra pot)
2 on/off (1ms to 2ms digital jump)
2 switchs to activate/deactivate Dual Rate on channels 1 and 2 (alerons and elevator)
The control sticks are calibrated from menu
Has 5 memory registers to setup this:
% de Dual Rate for each channel
Channel inversion
Channel trim
Chanel end points, both max and min
PPM signal normal or inverted
http://www.e-radiocontrol.com.ar/images/rcenconderlcddemo.gif

The circuit is very simple, the supply is 5v from a 7805 voltage regulator. The signal from control sticks is amplified in LM324 to improve the level to the A/D conversor of 10 Bits. The 5th channel is not amplified becouse the signal change from 0v to 5v in 300º (normal pot)

http://www.e-radiocontrol.com.ar/images/rcencoder_foto1.jpg

The stick pot only moves 60º of 300º, and the voltage across only change from 0 to 1v, that is the reason of amplification with LM324.

The other periphericals are switchs of digital channels, dual rates, setup buttons, a 16x2 display and a "piezo buzzer".

http://www.e-radiocontrol.com.ar/images/rcencoder_sch_big.jpg

http://www.e-radiocontrol.com.ar/images/rcencoder_brd_big.jpg
http://www.e-radiocontrol.com.ar/images/rcencoder_com_big.jpg

Display circuit:
http://www.e-radiocontrol.com.ar/images/display16x2circuito.jpg

Some setup screens:
Configuring max and min reading from AD to later calculations
http://www.e-radiocontrol.com.ar/images/rcencoder_display_p1198219.jpg
Channel inversion
http://www.e-radiocontrol.com.ar/images/rcencoder_display_p1198226.jpg
PPM direction
http://www.e-radiocontrol.com.ar/images/rcencoder_display_p1198227.jpg

BOM
Capacitors
C1 220n
C2 0.1uF
C3 0.1uF
C4 0.1
C5 220n
C6 220n
C7 18pF
C8 18pF
C9 220n

Semiconductors
D1 1N4148
IC1 LM324
IC2 7805 (1A)
IC3 PIC16F876
T1 BC547 o BC548 or similar NPN (CBE)

Miscelanious
LED1 Green
Q1(cristal) 20MHz
SG1 Piezo Buzzer

Resistors (5%)
R1 1K
R3 1K
R5 47K
R7 1K
R9 1K
R11 47K
R12 1K
R14 10K
R15 1K
R16 10K
R17 560
R18 10K
R19 10K
R21 1K
R22 10K
R23 10K
R24 10K
R25 10K
R26 10K
R27 1K
R29 47K
R31 1K
R32 1K
R34 1K
R37 47K
R39 10K

Trimpots (mini)
R6 1K
R13 1K
R30 1K
R38 1K

Channel Pots
R2 1K (1k trims)
R4 5K
R8 1K
R10 5K
R20 1K
R28 5K
R33 1K
R35 10K chasis channel(CH5)
R36 5K

Switchs
S1 Reset Microswitch
S2 Pulsa1 Button
S3 CH7
S4 CH6
S5 DualRate4
S6 DualRate3
S7 DualRate2
S8 DualRate1
S9 Pulsa2 Button

Some pics of the planes I fly with ths encoder:
.46 trainer
http://www.e-radiocontrol.com.ar/images/entrenador_recargando.jpg
Nemo, electric
http://www.e-radiocontrol.com.ar/images/adama_preflight1.jpg

Me =) and the encoder (old version without display):
http://www.e-radiocontrol.com.ar/images/ale_radiocontrol.jpg
My home site
http://www.e-radiocontrol.com.ar/

[lazy-b]

Thats Amazing works........Thanks for Sharing.

I use 16F877 in all my pic project.

[weber_alejandro]

with 16F876 I run out of memory EEPROM (data and programm) and RAM. For example, the memory channels names 1, 2, 3 etc.... can't put a name like "trainer 1" on it from setup because this.

Maybe in future versions use a PIC 18F family or a I2C memory.

greetings from Argentina
PS: Sorry for my bad english

[Acetronics]

Hi, Alexandro

really nice work !!!

worth a "parilla" fiesta !!!

I'll hold high my mate in your honor ...

Alain

[meteor]

Very impressive project, must have been a satisfying challenge to complete.


But, I'm a little confused... Why replicate what is readily available for very little money?

It seems that a garden-variety transmitter project is a lot of effort that could have been used for some other more unique challenge like an autopilot, or data recorder, etc.


Great work, regardless.

[village_idiot]

Because choice is good!

Also you should talk to Gordon Anderson about his Microstar2000 encoder, instead of working on new ground helping to work on the Microstar might be a good thing. His site is at http://mstar2k.com It's a PIC 18 based design.

And anyway, really good work!

[lazy-b]

I just wonder why do the Most Expensive Transmitter such as Futaba 14MZ cost more than USD 2000, still using the old mechanical Potentiometer, they just added a Ball Bearing.

I was hoping they use different sensor for positioning such as Magnetic , Optical, or CCD.......You would amaze that the more than 10 year old Microsoft Joysticks uses an CCD sensor to detect its Positioning.

One of this day, I will Build this Home-Made transmitter made by Alejandro or MSTAR2000.........I know, its really more expensive to build your own......but its the Pride and Joy, when you tell your RC Buddy friend.....it my home-made transmitter......Just like in the old days, I my Scratch Build Plane.

One Nice things about Alejandro designed, is it uses a very common electronics components, which is available anywhere, even the Circuit Board is Single Side easy to made .

Please Keep us Posted on your Next project.

Ellion

[sahilkit]

great work n thanks for sharing with us

u have a very good site with complete info from tx rx to coders cool :)

sahil

[lazy-b]

Guys, One Nice things about this Home-Made Pic controller Transmitter, You can Customized your own Mixing....its very easy to Reprogram it.

Been Thinking of Making my own HELI-CHAIR, Instead of Hacking an Expensive Futaba Transmitter, I could use this Alejandro's Pic RC Encoder.

here is the website for Heli-Chair......this is use for learning to fly a Real Helicopter:
http://www.heli-chair.com/

Alejandro, What Kind of Development Tool do you use, Have download your files, but when I tried to read it using Windows Notepad. it can not read properly, I can see the text but the format is not right.....maybe I need to use your Development tools to read the Source code.

Thanks

Ellion

[dleroi]

... Why replicate what is readily available for very little money?

Great work, regardless.

Because you don't have to reverse engineer it to get the schematic or part numbers.

Super job, Alejandro!

[weber_alejandro]

Alejandro, What Kind of Development Tool do you use, Have download your files, but when I tried to read it using Windows Notepad. it can not read properly, I can see the text but the format is not right.....maybe I need to use your Development tools to read the Source code.

Thanks

Ellion

Hi Ellion, I use to program C and for compiling CCS running emulated in wine (I use Debian Linux). The files can be open with any text processor after decompression. To recompiling you need a C compiler for PICs, after this, you can use your best PIC programmer to load the HEX file into the PIC data memory as usual.

By the way, that chair is awsome!. Imagine you can use a little wireless camera and a monitor over the chair for more virtual reality heli flight!

[weber_alejandro]

Very impressive project, must have been a satisfying challenge to complete.


But, I'm a little confused... Why replicate what is readily available for very little money?

It seems that a garden-variety transmitter project is a lot of effort that could have been used for some other more unique challenge like an autopilot, or data recorder, etc.


Great work, regardless.

Thanks Meteror. I make this project becouse my goal in this hobby is everithing related to electronics. I made my own power panels, battery chargers, battery cycler, diferent instrumments, etc. Spend a lot of hours build them, using it, flying it, there is my satisfaction.

Big part of my learning come from this forum!, and that's why sharing my project with you people; is in fact my honor.

Best regards to all!

[lazy-b]

Alejandro, Yes, I agree with you....your Source files should be readable on any Text Editor such as NOTEPAD or WORDPAD, or even a MS-DOS EDIT.COM.

I can read the TONESX, LCDSER05 files, but can not read the RCENCODER_V1.5 files.....I am using an Microsoft XP windows professional O.S.......Maybe its something to do with your Linus OS.....it might have remove the Line Feed, or Carriage Return,TAB Character.........Please try downloading it again from this Site and view it.

With your Source files, I can just recompile it so that I could use the 16F877 chip.....its much easier to get the 16F877 here in Manila.

I have not done any C language programming, Most of my project is done with Basic Language, I've been using Micro-engineering Basic Compiler...and use ICPROG to program the 16F877.

Yes, Plan to make that Heli-Chair......I've tried flying a Real Helicopter using a Robinson R44, the most difficult it controller the rudder using the Foot, its like learing to Steer the car using your Foot.

here is the Coaxial Robinson R22 with On-board camera
Pilots view:
http://www.youtube.com/watch?v=N3Hnos62RAs

Helicopter view:
http://www.youtube.com/watch?v=UTUxkxoV3U8

Here another Pic Base Transmitter encoder project using Basic Language posted by Acetronics (Alain).....its simple 4 channel that use PIC16F877.

http://www.rcgroups.com/forums/showthread.php?t=719250



Thanks

Ellion

[mike50]

Alejandro, Yes, I agree with you....your Source files should be readable on any Text Editor such as NOTEPAD or WORDPAD, or even a MS-DOS EDIT.COM.

I can read the TONESX, LCDSER05 files, but can not read the RCENCODER_V1.5 files.....I am using an Microsoft XP windows professional O.S.......Maybe its something to do with your Linus OS.....it might have remove the Line Feed, or Carriage Return,TAB Character.........Please try downloading it again from this Site and view it.


Ellion
The RCENCODER_V1.5 files work fine with Wordpad, just not with Notepad because Notepad only recognizes end-of-line when it sees both a carriage return AND a line feed. Wordpad handles lines that end with just a line feed as well.

So just use Wordpad.

Mike

[lazy-b]

Mike, Your Right......Thanks.

I just open it with the WORDPAD, Highlighted all the Text and Open up the NOTEPAD and Paste it, and then Save it again under different file name.

Now, I can open it with a NotePad.......I like NotePad cause some of my old computer using Windows 98.

Ellion

[serg10101]

I repeated your konstrukcyyu,ona very pleased me.