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by gjs31
Mon Jan 15, 2018 10:01 pm
Forum: Troubleshooting
Topic: Alternatives to omxplayer
Replies: 4
Views: 1769

Re: Alternatives to omxplayer

I had the same problem recently when I got my camera. I do everything through VNC (that way only one keyboard/mouse on my small desk). What you can do is from within the Pi VNC session Open VNC From the menu top right select "Options" Open the "Troubleshooting" menu Check "Enable experimental direct...
by gjs31
Sun Jan 14, 2018 9:50 pm
Forum: Beginners
Topic: Wire gauges
Replies: 2
Views: 368

Re: Wire gauges

Thanks. The motor controller and Servo board both have the screw down terminals, so I’ll try go with something like you suggested. I have bought a few spare XT60 cables/connection so I can try a few different ways before I play with the battery.
by gjs31
Sun Jan 14, 2018 7:57 am
Forum: Beginners
Topic: Wire gauges
Replies: 2
Views: 368

Wire gauges

Hi. I’m starting to gather bits for my next rover build, going bigger this time. Plan is to have 4x12 volt gear motors. I’ve got a nice new 11.1v lipo that is going to power the motors and a Servo board which is used for pan/tilt setup for camera. Pi will be powered separately. The lipo has larger g...
by gjs31
Fri Dec 29, 2017 5:10 am
Forum: Automation, sensing and robotics
Topic: Rover build
Replies: 9
Views: 1267

Re: Rover build

Thanks for that, nice to know that I am on the right track and not about to fry my second pi (being super cautious now).

So from that diagram the full voltage goes to the motor controller, and the stepped down 5v to the servo controller?
by gjs31
Fri Dec 22, 2017 11:59 pm
Forum: Automation, sensing and robotics
Topic: Rover build
Replies: 9
Views: 1267

Re: Rover build

Awesome, thank you.

Have started planning for the next build, going to slowly buy up on actobotics parts and make a decent sized 6 wheel rover.
by gjs31
Thu Dec 21, 2017 10:13 am
Forum: Automation, sensing and robotics
Topic: Rover build
Replies: 9
Views: 1267

Re: Rover build

So please correct me if I’m wrong, but can I simply go Lipo to splitter, then one of the splits to buck to motor controller, and off the other split to buck to Servo controller? Will this complete the grounding for the circuit?

I have a Lipo supply for the Rpi, which I’ll stick with.

Thanks again.
by gjs31
Tue Dec 19, 2017 8:56 am
Forum: Automation, sensing and robotics
Topic: Good Robot Arm and/or Hand.
Replies: 9
Views: 1545

Re: Good Robot Arm and/or Hand.

I found it in a store and it looks like the joints are driven by dc motors. Wouldn’t even know where to start controlling with those as opposed to servos.
by gjs31
Mon Dec 18, 2017 5:07 am
Forum: Automation, sensing and robotics
Topic: Rover build
Replies: 9
Views: 1267

Re: Rover build

Thanks for the reply. I actually just last week ordered 4 of the L9110s modules to switch out due to the drain from the L298N ones as you mentioned. Will keep those for when I scale up. Is it safe enough to split the power from a single Lipo into 2 motor bridges, servos, pi etc, for that matter a st...
by gjs31
Sun Dec 17, 2017 1:07 am
Forum: Automation, sensing and robotics
Topic: Rover build
Replies: 9
Views: 1267

Rover build

Hi, Looking for some feedback on my newbie rover build on a Raspberry Pi 3 vb, particularly around power. Have a simple chassis with four of those generic yellow motor gears (3v-6v I believe). These are driven by two L298n motor controllers and powered by two sets of 4xAA nimh rechargables, so 4.8v ...
by gjs31
Sat Dec 16, 2017 6:07 am
Forum: Automation, sensing and robotics
Topic: Good Robot Arm and/or Hand.
Replies: 9
Views: 1545

Re: Good Robot Arm and/or Hand.

I'm looking at getting one of these: https://www.littlebirdelectronics.com.au/robot-arm-kit-with-controller for a rover I'm slowly working on. Any thoughts on whether it would be possible to remove the arm from the setup and drive it off a servo board? I had a quick look at one in store and from wha...
by gjs31
Thu Nov 30, 2017 10:12 am
Forum: Troubleshooting
Topic: Ultrasonic sensor only returning values of 1.0
Replies: 12
Views: 1130

Re: Ultrasonic sensor only returning values of 1.0

Thanks. Haven’t had a chance to try it, but I know i2c is enabled, so hopefully that will solve it. Any way to run it alongside i2c, is it just a case of using different gpios?
by gjs31
Wed Nov 29, 2017 11:07 pm
Forum: Troubleshooting
Topic: Ultrasonic sensor only returning values of 1.0
Replies: 12
Views: 1130

Ultrasonic sensor only returning values of 1.0

Hi, I'm trying to get the ultrasonic theremin to work form the projects pages ( https://projects.raspberrypi.org/en/projects/ultrasonic-theremin ), but after checking everything over again, and even buying a new sensor, all I still get back is 1.0. I'm using a Rpi3 B, a HS-SR04 sensor, and resistors...
by gjs31
Sun Nov 26, 2017 3:31 am
Forum: Troubleshooting
Topic: I setup ultrasonic Sensor without resistors
Replies: 10
Views: 2251

Re: I setup ultrasonic Sensor without resistors

Ok, so if I run it through 3.3v I should be ok. That and check all documentation thoroughly.

Thanks again for the help!!
by gjs31
Sun Nov 26, 2017 12:07 am
Forum: Troubleshooting
Topic: I setup ultrasonic Sensor without resistors
Replies: 10
Views: 2251

Re: I setup ultrasonic Sensor without resistors

The documentation I'd read have all had the lcd backpack plug directly into the 5v, ground and gpio2 and 3. For example this Osoyoo one ( http://osoyoo.com/2016/12/01/use-raspberry-pi-display-temperaturehumidity-to-i2c-lcd-screen/ ). Gat a new Pi yesterday and had actually set the lcd back up as per...
by gjs31
Thu Nov 23, 2017 6:18 am
Forum: Troubleshooting
Topic: I setup ultrasonic Sensor without resistors
Replies: 10
Views: 2251

Re: I setup ultrasonic Sensor without resistors

Ok, so I ran the test you referenced. Write 1 to gpio 2 failed Pull up on gpio 2 failed Skipped non-user gpios: 0 1 28 29 Tested user gpios: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Failed user gpios 2 Then it crashes. I'm assuming it is now a paperweight, or is ther...
by gjs31
Wed Nov 22, 2017 11:46 am
Forum: Troubleshooting
Topic: I setup ultrasonic Sensor without resistors
Replies: 10
Views: 2251

I setup ultrasonic Sensor without resistors

Ok, I’m a beginner and I’m pretty sure I’ve just made a noob move. Please be gentle. Was setting up a HC-SR04 ultrasonic Sensor on my Pi3, and not really paying attention I set it up without resistors. Tried running some python scripts for about 20 mins not getting results till I realised my stuff u...
by gjs31
Sun Nov 19, 2017 1:20 am
Forum: Beginners
Topic: Need a motor controller
Replies: 2
Views: 448

Re: Need a motor controller

Thanks, I've ordered a couple of L298N's, they seem simple enough to work with.

In thinking it through, I will most likely put a sense hat on it to play around with, and from what I can tell most hats can't stack together, so the L298N's can sit to the sides or underneath.
by gjs31
Sat Nov 18, 2017 2:49 am
Forum: Beginners
Topic: Need a motor controller
Replies: 2
Views: 448

Need a motor controller

Hi, I'm looking for suggestions for a motor controller hat for a beginner, using a Pi 3 Model B. I've been playing around getting motors working using what I have on hand, which is just a couple of TA7291P chips. They are ok, but painful to setup and use. Have set it up to drive two motors with inte...
by gjs31
Sat Nov 04, 2017 2:45 am
Forum: Automation, sensing and robotics
Topic: Robot platform compatibility
Replies: 3
Views: 507

Robot platform compatibility

Hi. Apologies if this is a dumb question, but would all basic robot platforms (chassis, wheels, motors) be compatible with the Pi? I've been looking around and they all suggest different controllers, but am I right in thinking as long as I have an appropriate Pi motor controller they should all work...

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