jaeyoung-lim / rosppm Goto Github PK

Hi again!
Sorry to bother you again!
I want to send commands through the radio transmitter (I have the same as you TG 9x).
So I am using this node to send the ppm signal to the transmitter through the pins, avoiding the trainer port, cause the transmitter is very old and I have serious doubts that it works fine.

I have set up a small test bench with the receiver and a servo to make sure the communication is good.
However, whenever I try to publish to the set_ppm topic, it doesn´t work. I can see with an oscilloscope that the signal in pin 10 changes.

The transmitter and receiver work properly so I think it might be that there is something I am not doing right while publishing.

To publish the topic I use:

rostopic pub --once /rosppm_interface/joy_set_channels sensor_msgs/Joy '{ header: {seq: 1, stamp: {secs: 0, nsecs: 0}, frame_id: "1"}, axes: [650.0,650.0,650.0, 650.0, 650.0,650.0], buttons: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]}'
(650 cause it is the minimum value attending the Arduino script quotes)
I would like to control any single channel.

What is what I am doing wrong??
I can read the channels properly, but I cannot publish them.

Problem launching rosserial_python package in rosppm

Issue posted in the rosserial repository

Hi Jaeyoung,

First, thanks for making the code available!

I may be misunderstanding part of the install process, but when I try to flash the rosppm_arduino.ino on an arduino using the arduino IDE, get at missing file error:
rosppm/ppm_io.h missing

Is this file with another library? The installation instruction say:

catkin_make --pkg usb2ppm_ros

I checked your usb2ppm package, and I do not see the ppm_io.h file.

Thanks! I would much prefer to use your code over rewriting the same thing :)

I've tried and followed all of the steps given and connected a Turnigy 9X via an Arduino Uno on ROS Kinetic. I am new to ROS so please point out anything that doesn't seem correct. The Arduino has the 'rosppm_arduino' program included in the master branch.

Now firstly, I would like to point out that in the launch/read_Tx.launch file, the baud rate is set to 115200 but it is 57600 in launch/send_Tx.launch file. Is this how its supposed to be? It shows an 'Unable to sync' error for read_Tx.launch at 115200 and connects when I change it 57600.

After launching roslaunch rosppm send_Tx.launch and roslaunch rosppm read_Tx.launch I do not see /rosppm/channels created as mentioned in the instructions. The only topics listed are:

srijal@Srijal-PC:~$ rostopic list
/diagnostics
/rosout
/rosout_agg
/rosppm_arduino/read_ppm
/rosppm_arduino/set_ppm
/rosppm_interface/joy_read_channels
/rosppm_interface/joy_set_channels

Also I get this error sometimes:

[ERROR] [1504288634.686663]: Parameter /rosppm/mode does not exist

and on rostopic echo /rosppm_arduin/read_ppm I get the following output continously:

---
header: 
  seq: 37
  stamp: 
    secs: 0
    nsecs:         0
  frame_id: ''
a: -2.294921875
b: -2.294921875
c: -2.294921875
d: -2.294921875
e: -2.294921875
f: -2.294921875
g: 0.0
h: 0.0
i: 0.0
---

And it doesnt change when I move anything on my Transmitter (I have removed the RF module from the back as it is normally done when using simulators).

What am I doing/What should I try next?

New Feature: Read Channel Values

Implementations should include

• Reading ppm signals from Pin 10
• Flags to select from reading or transmitting ppm signals

Hello Jaeyoung-Lim,

Would be nice to see the Arduino connected as a device on the I2C-bus (multi device bus) instead of the serial-bus (single device bus), this way the serial bus stays available.

Regards,
Roland Penning

Hi there!
Thank you for releasing the code!

I am having some problem will flashing the arduino.
May be the problem comes from the installation commands.
I follow the github commands, however when I reach the last line
catkin_make --pkg usb2ppm_ros
that yields:
Packages "usb2ppm_ros" not found in the workspace
so I correct it by changing usb2ppm_ros into rosppm that apparently works fine.
However when I try to flash the arduino, I get the following error:
rosppm/ppm_io.h: No such file or directory
I tried the solution given in the issue https://github.com/Jaeyoung-Lim/rosppm/issues/6
but it doesn´t work.
So I cannot flase the arduino.

Thank you in advance

ROS commands are not getting into the command values