Niall Dempsey
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3DR Radios - 433mHz or 915mHz for a ground vehilce?

Started this discussion. Last reply by Josh Potter Jul 26, 2012. 4 Replies

I'm considering purchasing a 3DR Radio kit for a ground vehicle, which is the best option in this situation, 433mKz or 915mHz ? My understanding is that the 433mHz is probable the better option.Also,…Continue

FarmBoz Project

Started this discussion. Last reply by Adam Scriven Jul 5, 2012. 1 Reply

I'm new here and by way of introduction I'd like to provide a link to my FarmBoz project and hopefully get some input and feedback for its further developement.Link for project -…Continue

 

Niall Dempsey's Page

Latest Activity

Niall Dempsey replied to Alain Sutter's discussion ArduRover without steering servo in the group ArduRover User Group
"This may help. Its the code I use to convert to PWM for the motor controllers. // Remote control ...... #define CH1Max 1830 #define CH1Min 1040 #define CH2Max 1810 #define CH2Min 1055 unsigned long CH1val = 0, CH2val = 0; int CH1adj_val = 0,…"
Nov 12, 2012
Niall Dempsey replied to Carlos's discussion Gps guidance in the group ArduRover User Group
"I agree, if the Mission Planner can be automatically pre-loaded this should give us a solution.     There were some comments earlier regarding the accuracy of the GPS. I'm using the uBlox and I'm not overly worried…"
Nov 12, 2012
Niall Dempsey replied to Carlos's discussion Gps guidance in the group ArduRover User Group
"I'm also a farmer working on something similar to yourself. I think the ArduRover is a great starting point for this kind of project. The main problem that I'm having is understanding the ArduRover code. Currently I'm using a second…"
Nov 12, 2012
Niall Dempsey replied to Alain Sutter's discussion ArduRover without steering servo in the group ArduRover User Group
"I'm using a second Arduino with 40 amp  4QD Motor Controllers. The signals can be read in using the PulseIn() function, adjusted as required and then outputed as PWM using AnalogueWrite(). It should be possible to alter the ArduRover code…"
Nov 12, 2012
Niall Dempsey commented on Thomas J Coyle III's group ArduRover User Group
"@ Thomas Found the problem, needed a common ground between APM and Arduino I've also got a slight problem with the Mission Planner. A lot ot the time it seems to think its an ArduPlane instead of a APMrover. I regularly need to exit MP and…"
Sep 26, 2012
Niall Dempsey commented on Thomas J Coyle III's group ArduRover User Group
"Thomas - Thanks for your help I had considered Sabertooth motor speed controllers but I ended up buying from 4QD in the UK and I've been using them for a couple of years with no problems. In my current setup I'm using an Arduino and it…"
Sep 26, 2012
Niall Dempsey commented on Thomas J Coyle III's group ArduRover User Group
"Hello All, I purchased the APM 2.5, uBlox GPS and 3DR Radio Kit and got it up and running with the Mission Planner. I now want to use this with an AGV that has tank steering. The 2 motor speed controllers I'm using have inputs for a PWM signal…"
Sep 25, 2012
Josh Potter replied to Niall Dempsey's discussion 3DR Radios - 433mHz or 915mHz for a ground vehilce?
"You can use 433 in the US if you have the appropriate level amateur radio license."
Jul 26, 2012
Niall Dempsey commented on Thomas J Coyle III's group ArduRover User Group
"Just placed an order for APM2, uBlox GPS and 3DR Radio Kit"
Jul 20, 2012
Niall Dempsey replied to Niall Dempsey's discussion 3DR Radios - 433mHz or 915mHz for a ground vehilce?
"Great, thanks Vernon. So I need to go with 433mHz and the FTDI cable is included in the kit."
Jul 19, 2012
Vernon Barry replied to Niall Dempsey's discussion 3DR Radios - 433mHz or 915mHz for a ground vehilce?
"The whole air/ground module is the fact that these are modems and communicate on the wire side of the radio via TTL level serial (the same thing Arduino uses natively). The ground modules had an additional FTDI chip to convert the TTL to USB. On the…"
Jul 19, 2012
Vernon Barry replied to Niall Dempsey's discussion 3DR Radios - 433mHz or 915mHz for a ground vehilce?
"What matters is what country you live in. The 915mHz is legal in the US and the 433mHz is legal in some other countries. That fact is actually covered on the page. Don't operate a radio that is not legal where you live."
Jul 19, 2012
Niall Dempsey posted a discussion

3DR Radios - 433mHz or 915mHz for a ground vehilce?

I'm considering purchasing a 3DR Radio kit for a ground vehicle, which is the best option in this situation, 433mKz or 915mHz ? My understanding is that the 433mHz is probable the better option.Also, I noticed that the 915mHz kit comes with an air and ground module where as the 433mHz has 2 air modules. Why is this and how can one of the air modues be converted to a ground module?See More
Jul 19, 2012
Niall Dempsey commented on Thomas J Coyle III's group ArduRover User Group
"I'm in a different time zone so I'm a bit out of sync with the discussion. I'm currently using  a HMC6352 compass and had to move it 2 feet away from the motors, even at 8 inches away from the 2 * 11 amp motors it was useless. As…"
Jul 18, 2012
Niall Dempsey commented on Thomas J Coyle III's group ArduRover User Group
"@Thomas Going for APM1 seems feels like a bit of a backward step and I don't think there's much of a price difference. However, the robot is only intended for a top speed of about 5 miles/hr so that probable leaves the gyro and…"
Jul 17, 2012
Niall Dempsey replied to mauro maffioli's discussion ardurover for a slope mower.
"I agree that GPS on its own is unlikely to be accurate enough for what you need. Have you any pictures or more information on what you have achieved so far?"
Jul 17, 2012

Profile Information

About Me:
A farmer with an interest in technology.
Please tell us a bit about your UAV interest
Interested in ground vehicles and have had a few attempts at building them. This is a link to one of them http://clikire.snappages.com/farmboz-3.htm. Also, might have a go at building a UAV plane or coptor at some stage.

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