Im looking to make a car accident project based on arduino andb2 cars module.
The idea basically depends on having a very accurate gps module in both cars and i will transmit the coordinates of bot cars so i can manage both of them not to collide together.
The data will be transmitted via wifi. My problem here is with gps module, what gps is available for such accurate application?
The limit of GPS accuracy is a few metres.
I don't think that GPS alone will work for your application.
assuming you have enough precision (don't dream few cm) - common GPS update only at 1Hz, how fast do the car go?
at 40Km/h your car will have moved by 11cm in between 2 GPS updates - enough to collide possibly
Use IR transmitters on the cars and 3 IR detectors to triangulate the position of the cars. This technology is used by a model train posision detekting system.
@Railroader link, please!
I'll see if I can find it. The system is used by Hassleholms modell rairoad in Sweden.
Any ideas? My project should have sets of data to be transmitted from one car to another its (v2v) project
I have Emailed them, asking for the link. I don't find it on their home page.
I am only using 4 dc motors at 12 volts. All working at full speed while moving forward.
Thats why iam asking for an accurate gps module to sense that small change in position
do you care about absolute position in the world or position of the cars respective to each other and how close they are ?
if this is just for relative positioning you could explore UWB modules and anchors at known locations
you could also explore differential GPS techniques if you want to stick to GPS
I think you'd better look for an alternative solution to avoid collision. GPS may not be fast enough.
However, a GPS and GSM based accident avoiding car project is here.
They used SIM28ML for GPS.
Your project is to avoid the accident, yet you link to a project that reports an accident AFTER it happens. Why?
https://learn.sparkfun.com/tutorials/what-is-gps-rtk/all
A GPS receiver capable of RTK takes in the normal signals from the Global Navigation Satellite Systems along with a correction stream to achieve 1cm positional accuracy.
The rate varies between receivers but most will output a solution at least once per second; some receivers can output this higher precision solution up to 20 times a second.
You may not like the typical antenna, tho. Or the price.
Not if you are a civilian.
Use LIDAR.
The OP has not defined the problem and requirements very well (as usual), and "very accurate" is ambiguous, but 1 cm accuracy with RTK-GPS (see post #13) which is available to civilians, seems like it is probably good enough. There may be other practical problems with RTK-GPS, but that's up to the OP to decide.
If you are seroius about your project then Lidar is the way to go, but you also need processing power.
If you just want to do a proof of concept then this would be the most practical and an Arduino could accomplish this.
Even using more than 3 sensors would be practical.
I'm not sure if you have Googled;
arduino obstacle avoiding car
Before you began making decisions about your project.
Tom.. 
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.