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Mid-sized rover design

December 10, 2019, 7:14 am
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@Anelito wrote:

Hello,
I’d like to create something similar to this rover, a perfect test hardware to try new software functions and sensors with enough room for various payloads. I hope it can be useful for anyone looking for a diy mid-sized rover at a reasonable price (whereas commercial solutions this size are usually sold for over $1k).

dr-robot-jaguar-4x4-mobile-platform-chassis-motors-1-large

Another source of inspiration is the robot on this video (building process part1 and part2).
This robot uses a welded steel frame measuring 34x81cm with ø40cm wheels and 2x 500W motors. It is quite heavy and needs to be loaded on a truck.

My own version would use the same geometry, similar structure but much lighter, with an aluminium frame, easily transportable by a person.
I’m using 120W 12V DC motors and ø25cm loading cart wheels; running numbers the frame dimension should be 21x50cm. Wheels are paired via a chain and then to the motor, one motor per side (a 4WD setup with two motors), with skid steering.
Do you think it can work? Any suggestions?
Thank you

Wheel
AC_UY218_ML3
Motor
Robu-2
Rover upgrade (suspensions)

e2f7cf1ee8fdf1a3e632aa1a7000a08c
e2f7cf1ee8fdf1a3e632aa1a7000a08c.jpg700×350 49.4 KB

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Help Explain Battery Percentage

December 10, 2019, 10:23 am
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@bensonjv wrote:

Can someone give me a basic 101 overview of LiPo battery percentages and how to interpret (or point me to a resource)? We got our Octoquad flying and I’m doing multiple series of tests to learn about predictable power consumption and flight times possible on a single charge. Here’s what I think I know about LiPo:

  • Nominal, resting voltage of a LiPo cell is 3.7
  • Max, full charge of a LiPo cell is 4.2
  • Storage voltage is +/- 3.8
  • Minimum discharge voltage (don’t go lower or you could damage battery) is 3.0-3.3
  • I understand we use voltage vice capacity to assess how charged a battery is because of difficulty in measuring capacity.

For discussion purposes, I’m using a Tenergy LiPo 5-in-1 tester on Tattu 30,000 6s batteries.

Here’s what I need help understanding:
What does the percentage rating mean ~ specifically, what constitutes 0%?

Presumably, if a tester says your 6s battery is 98-100% charged and voltage is 25.2 then 100% = 25.2 volts. But clearly 0% is NOT 0 volts since a ‘dead’ battery is not necessarily a fully discharged battery. Is 0% represented as the minimum required 3.0-3.3 per cell or 18-19.8 volts?

If yes, then the 0-100% charge range is measuring how much of the 5.4 volts is available for use (25.2 – 19.8)? That appears to be the case. At 39%, volt total measured was 22.88 which is +/- 39% in the ball park. Battery is smart enough to know how much of total voltage is available for use and testers calculate that as percentage.

Thank you for corrections or validation.

JB

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Frsky Telemetry Matek F405-Wing and r-xsr receiver

December 7, 2019, 1:22 pm
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@voi9viper2 wrote:

I have been trying to get telemetry to work for literally months. I have tried everything I could find. A max3232 converter did not work. Several circuits I found on the internet did not work until I built the attached converter. It must be supplied with 5V. 3.3V does not work. 2n3904 transistors can be used instead of BC547s, but the pinout is reversed. I think the problem is the voltage levels needed by the r-xsr receiver, but it could also be the max232 mini converters I got from amazon. I got one out of 10 to work with my pixhawk FC. The circuit came from a german website, kudos to whoever designed it. !
frskyinvert|659x208

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Photos Missing in Build Log

December 10, 2019, 1:37 pm
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Logging with Kakute F7 mini (has no micro SD card slot!)

December 10, 2019, 4:24 pm
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@Hacky wrote:

I am looking for ways to log from Kakute F7 mini (which has no micro SD card slot) to Mission Planner. Currently only a few messages appear in the “Messages” tab of Mission Planner when FC is connected via USB.

As there is currently something behaving strange on the drone which results in stopping the motors during flight. It can also be reproduced when the drone is held in the hands (without props) and in that case it would be possible to have the USB cable connecte to the PC running Mission Planner.

When LOG_BACKEND_TYPE is set to 2 (MAVlink logging) it should output some logging via telemetry and when connected via USB I also would expect this logging data somewhere in Mission Planner - but where? It does not appear in the “Messages” tab.

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Swarm Problem of two boats used the rover-firmware

December 11, 2019, 12:20 am
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@lmy568 wrote:

Hi，
i have two boats used the APMRover3.3 Firmware, i want to swarm them, but when i did every procedure just as the mannul , the followers just stay there. Has anyone had this problem.
thanks a lot please give me some advice

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Impossible to connect Cube to MP by USB

December 11, 2019, 1:16 am
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@ffb.boy.30 wrote:

Hi,
I’m trying to connect my cube to Mission planner.
I can the COM Port on my computer but Mavlink block and failed when I launch the connection.
I follow this tuto
https://ardupilot.org/planner/docs/common-connect-mission-planner-autopilot.html
with a baudrate at 115200.
The cube is only linked to the GPS and the buzzer.
I make the connection with the micro USB on the side . I’ve tried multiple USB cable.
Is there a tips to debug the problem ?

Thanks

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4 PingRX ADS-B receivers for sale

December 11, 2019, 1:35 am
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@Elof wrote:

Hi There! I have 4 or 5 uAvionix pingRX ADS-B receviers for sense and Avoid. At least two of them are in unopened packages. All in good condition. 150 € per piece plus shipping from Stockholm - Sweden.

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ArduPilot Monthly Update for Dec 2019

December 11, 2019, 3:21 am
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@rmackay9 wrote:

title-image
title-image.png800×319 292 KB

Here is a link to the monthly update for Dec 2019 presented by Tridge and I and a few other devs at the monthly Partners meeting.

By the way, the image on the left is for the MegaSquirt1 EFI system (ArduPilot now supports this device). The image on the right is of @zhangsir’s minature helicopter (blog, video).

We’ve said it before but we really appreciate the support we get from our Partners! Thanks!

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Mesh telemetry radio

December 11, 2019, 4:46 am
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@promistrio wrote:

Hello. Once, our company faced the problem of controlling a large number of drones. The main problem was in the organization of communication. You need huge and expensive equipment. As a result, the idea was born to develop a communication channel that supports grid technology. During the operation, additional features appeared to solve the narrowly focused tasks of our small company. Now we have decided to appeal to the community. Probably, you will be interested in this functionality too:

Wi-Fi Mesh network.

Range of communication on WiFi on printed antenna 50m in the city and up to 400m in the field. Range 868MHz > 4 km in open visibility (in the field)

Retransmission capability*

Wireless upload of photo points *

Wireless downloading of logs *

Mobile application for device management

Synchronization in the cloud:

  • Flight missions

  • Points of photographing*

  • Photos *

  • Log files *

Setting up software modules from your phone via WiFi *

Built-in support for MAVLink.

Cooperation between devices without a base station*

Offline maps in the mobile app (Mbtiles)

Video transmission *

Implementation in power bank format (via OTG) *

Real-time trajectory collision correction*.

Connection to MP QGC via UDP

  • something (*) that has not yet been implemented or in developing.

Not everything on the list is implemented perfectly.

How does it work now? The ground module is an access point

HDUsUKhycvBdjaVnDxgHflaKdCLWMZTzdmdkgG4q8xwIPhTcZA8S64aP6wuZsfeeUQ1CjfA1Ollt5Ggk5wi49E0hSC0e2c2k1PHT4Jq4euCX3eZWVPtYa5jD1TuWV_ONnwZXwEn0931×633

to which “operators”

image
image.jpg426×1109 201 KB

such as mobile phones, or a computer are connected. There are two ways of communication presently: WiFi 2.4 GHz and FSK 868 MHz (at the moment, not a grid but a star with repeaters). Further, all control is carried out by UDP Protocol through MAVLink. We are going to publish a mobile application within 1-2 months.

The purpose of this message is to understand whether this product can help you or your company, to hear comments and suggestions.

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Using ArduCopter without any GCS

December 11, 2019, 11:42 am
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Help noob: Cannot calibrate compass

December 11, 2019, 12:56 pm
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@butchalline wrote:

My set up:
MP 1.3.7
Rover 4.0
Pixracer with buzzer
Compass+GPS Matek M8Q-5883 mounted externally 8 inches above FC.

Many attempts to calibrate with onboard mag calibration never go above 99% before restarting.
Tried using “relaxed”, setting COMPASS_OFFS_MAX to 2000, using different locations, Qgroundcontrol, and even RTFM with no joy.

Wiring checks OK and GPS works fine even indoors. Flight data screen responds to vehicle movement but is almost 45 degrees CCW from vehicle position. Compass and FC arrows are pointing in same direction.

Suspect I2C on this unit is not set up properly or is not being read properly. Have looked at U-Center software to tune this unit, but would rather no go down that rabbit hole if there is a simpler solution.

Any and all help appreciated.

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Would this hexa motor arrangement work?

December 11, 2019, 1:20 pm
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@ninja_zx11 wrote:

Hi all,
I am planing to build hexacopter using the custom layout as shown in the attached pic.Please suggest if that would work?I need this arrangement so that i can have open space on the front to get prop free video using GoPro on 3axis gimbal.I am planning to place battery in the rear.I would really appreciate your suggestion.

concept
concept.jpg1188×910 177 KB

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Drone Not Stable

December 11, 2019, 8:36 pm
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@tj272004 wrote:

So I am using the APM Board 2.8 with the latest version it can take because it is outdated. I believe it is 3.1. And after completing my build (3508 700kv motors with 40 amp 4-in-1 ESC), I attempted to fly it. Unfortunately, whenever I raised the throttle it would lean one way or another and then when the throttle was raised enough for liftoff it flipped in that direction. I looked on ArduCopters page about troublshooting that issue and I did everything it said. I calibrated again and again both my sensors and my radio and my ESC. I also checked wiring from the ESC to the FC and when I’m just testing which ones move fasted based on what input, it is responding correcty. The only problems I had with the copter were that the battery cells weren’t that balanced and my center of gravity was perfect, but I don’t think that should cause that problem. Any idea on how to fix it?

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Connecting Proper Servo Wires to Pixhawk

December 11, 2019, 10:47 pm
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@vyoufinder wrote:

I don’t see any specifications for servo wires for connecting the motors to the servo rail on the Pixhawk. I understand different brands of servo wires and their connectors are different. Which type of servo wire is ideal for Pixhawk? I mean like Futaba, JR, Airtronics…

I am also wondering about if there is any problem if I use longer servo wires? Is there a limit to the length I should use?

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Some more data on "BadLogging" message

December 11, 2019, 11:03 pm
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@voi9viper2 wrote:

I have been trying to track down the cause of the “Bad Logging” messages I keep getting, even though my DataFlash logs look fine. The message comes from FRSKY Telemetry, so not everyone will have this issue. I managed to track it down to the MAVLink backend. If the LOG_BACKEND_TYPE does not enable MAVLINK as a backend, no more “Bad Logging”. I’m trying to find exactly where the fail occurs, and why it does not get reset if it’s a temporary condition. I’ll update this post as I learn more, but at least I can now turn off the messages with LOG_BACKEND_TYPE.

Also, the message is really misleading. I spent lots of time and effort trying to find an SD Card that would work, when the Dataflash file wasn’t the issue at all.

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DGPS simulation with sitl and mavproxy

December 12, 2019, 4:58 am
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@tomlogan wrote:

Hi,
I achieved to use different gps on sitl but I could’nt find one with just dgps capability.
Should I use a module of Mavproxy ? the DGPS one ?
My drone uses the navio2 with the ublox M8.

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Compass not calibrated message after every reboot

December 12, 2019, 5:36 am
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@hosein_gh wrote:

hello everyone
i’m getting compass not calibrated message on ground station after every reboot since i updated to 3.6.11
what should i do with this problem ?
config :
pixhawk 2.4.6 with AC3.6.11
Ublox M8N GPS (OLD version)
gps-promak

i disabled internal compass and using external compass only

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Intel RealSense L515

December 12, 2019, 5:58 am
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Bendy ruler,with rp lidar

December 12, 2019, 8:11 am
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@111123 wrote:

Hello,
i have a question about bendy ruler.I managed to connect an rp lidar to pixhawk and get some measures,then i tried to enable the object avoidance feature,so i did the configuration below:
AVOID_ENABLE = 2 (“Use proximity sensor”)
OA_TYPE=1 (“Bendy Ruler” )
OA_LOOKAHEAD= 5m
OA_MARGIN_MAX= 3m
the first problem i encounter is that the options about the obstacle data base are not available (i refreshed the parameters and reboot ardupilot).The second problem is that when i experiment with the feature (in Auto mode)the rover just stops in front of an obstacle rather than try to dodge it,and continues its mission when i remove the obstacle.(firmware Rover 4.0.0)
Any advice would help…
Thank you

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