Hi, I have connected an hc 05 module to a GlobalSat bt-338. I want to be able to receive the gps information and use that information if it is stable to tell my robot where to go(to follow the bt-338), and if it is unstable(indoors the gps information is not accurate), I would like to read the signal strength to roughly know the location of the bt-338. I can get the gps info fine, but I need to know how to receive the signal strength without entering AT command mode and using AT+INQ. I also need to be able to switch between the two method quickly.
I would like to read the signal strength to roughly know the location of the bt-338
Locating, using signal strength from one source, is simply not possible, and for practical reasons, you can't get the distance either.
People ask the same question every week on this forum, and get the same answer.
jremington:
People ask the same question every week on this forum, and get the same answer.
Nah, several times a week ...............................
I am aware that you cannot locate using signal strength, but you could use signal strength to average out the unstable gps location, right? If there is a gps module on the robot you should be able to find a general location even if it is several meters off, its a start. then the robot can try to follow the device while monitoring signal strength, so if the signal strength weakens it can re adjust and then follow the device in that manner while staying halfway in the range. So it wouldn't be able to follow at exactly 10 ft or something and it wouldn't be able to follow as fast, because it would have to re adjust. But I think it would work enough for my project.
Anyway I was asking how to get the hc05's signal strength without using AT commands?
Any ideas?
Nathan
Let's say you do get the relative signal strength values over time. How would that tell your robot which direction to travel? Just wandering will likely be the result.
Paul
Nerdman4551:
Then the robot can try to follow the device while monitoring signal strength, so if the signal strength weakens it can re adjust and then follow the device in that manner while staying halfway in the range.
Sort of.
But you would need a Bluetooth device with an omni directional antenna, otherwise you would get a situation whereby you turn and head away from the direction of the Bluetooth beacon and the signal strength gets larger.
Are there Bluetooth devices with omni directional antennas ?
I have no idea.
But do try it.
RSSI measurement around me would be meaningless... everything is 2.4 GHz.
I'm not sure if Bluetooth can have omni directional antennas, Ill have to look into that, And its only linked to the bt-338 so I think that is the only signal it should read.
Nathan
suggest reading up about RSSI... not how it works.
I'm not sure if Bluetooth can have omni directional antennas, Ill have to look into that, And its only linked to the bt-338 so I think that is the only signal it should read.
Nathan
My idea was to use the gps to get a general location(even if its unreliable) and then head toward the device, monitoring the signal strength to see if its moving closer to the device or farther from the device.
Then find the location of the device(roughly) and follow it keeping about halfway between high signal strength and low. Basically a lot of trial and error.
wait what's the point... cant do this with HC05 in any case...
Ok, will read tonight
Thanks