I'm stacking a SeeedStudio Bluetooth Shield on top of a Olimex EKG/EMG Shield.
At first, I stacked the two loading only bluetooth shield demo code and all the LEDs lit up brightly and worked fine.
Now (having only taken a shield off and put it back on), the lower shield's (Olimex) power LED appears dim and the upper shield (Bluetooth) is not powered at all. The lower shield's power LED brightens when I remove the top shield.
Not sure what happened here -- both shields work perfectly if they are the ONLY shield on top of the Arduino. Is there any way for me to check the output voltage coming from the lower shield (Olimex) to the higher shield (Bluetooth) with a multimeter to see if it's sufficient (3.3V)?
Looks like you may really have a current problem.
Your Bluetooth shield can draw up to 100 mA and it is 3.3 V.
Your Olimex shield does not have details about the power but even assuming 20 to 30 mA, looks like you do not have enough current from the Arduino 3.3 V which is limited to 50 mA.
The easiest solution would be to use an Arduino bluetooth shield instead of the actual one, which would be 5V instead of 3.3 V and then you solve the problem of the current limitation for both the Olimex and the bluetooth connecting the Olimex jumper to the 5V and the bluetooth on top.
Alternatively, you can try to use a level shifter for the bluetooth on top of the Olimex. Slightly more complex but would allow you to use the 5V and save the actual bluetooth.
Related
I have outdoor LED strips that are bluetooth controlled, Govee ones. I presently have to go to different regions in the house to turn them on and off from my phone via bluetooth connecttion to the light strips, all 5 individually. Is there a bluetooth range extender I can get to have better coverage to the LED strips? I see range extenders, but they are all for audio, I am just looking to have better access to the strips. Any product if it exists to help for this would be much appreciated, thanks
Reno
Tried connecting locally, no problem but need to go somewhat close. Found some bluetooth extenders, but they are geared for audio
Hoping someone can point me in the right direction as I need to develop a simple 2 button bluetooth device that acts as a 2 character keyboard when paired.
( tried repurposing camera shutter devices but to no avail).
What would be teh best suggested development system and chipset for such a simple device ?
Thanks
Alan
Is it possible to calculate the distance between an arduino bluetooth shield (BLE Shield 2.1) and cell phone? More specifically, when the cell phone is within <5 feet of the shield, I want it to perform an action. I know BLE Beacon technology is able to do this in a general sense (immediate, near, far) so I'm wondering if it is possible?
Looking through stack overflow, I've found the following answers but they are all dated:
Answer 1
Answer 2
I know that ultrasonic frequency and laser sight are both options but I am trying to keep costs low so I would prefer a way in which the distance is calculated without the use of an additional tool.
Yes you can use it for distance calculation based on RSSI (received signal strength). You should implement iBeacon on Arduino side as stated in Eirik M answer. The most important thing in my opinion is that you have to be aware of BLE/iBeacon precision.
Please read carefully the following articles to determine if iBeacon technology fits to your needs. If so, implementation should be straight forward.
Broadcasting power and RSSI
The Beacon Experiments: Low-Energy Bluetooth Devices in Action
If BLE beacons are good enough for you, it should be fairly easy to implement a beacon for the Arduino shield. There are a few things you need to be aware of, such as output power and antenna characteristics. I recommend to read up on beacon technology to understand how it works.
I have a project using quadcopter(ARDrone).
And i want to controlled it unmanned indoor, using arduino board and iBeacons.
iBeacons send signal strength and floor info to arduino board(inside ARDrone connected main board) and iphone for searching location in building. Project is just controlling drone to go to iphone's location by itself. All calculation parts are managed in server.(triangulation etc.)
Here are the questions.
How can arduino board receive bluetooth 4.0 signal and send it to
server? 4.0 signal can be received by bluetooth 2.0 module?
Do i need to build bluetooth 4.0 receiver module? Or are there any other ways?
In server, complicated calculation will be managed by programs in c++ language but simple things are handled by web language. php? jsp? or other lang which one is better?
and some hints for this project.
I really need your help. thanks;)
3. The calculations to identify the location from the received signal strength and location of the Beacons are fairly straightforward, so should be fine in which ever language you prefer. You will need to use Trilateration, once you have converted RSSI (received signal strength) into a distance.
4. The major challenge you will have is getting accurate distances, iBeacons as you know use Bluetooth LE, what you may not know is that this operates on a Microwave wavelength and so is easily disrupted by humidity in the air, as well as other objects like people. This means that the RSSI readings will jump about a bit, a basic way to overcome this is to take an average over several readings, even so the distances found will be rather inaccurate in many circumstances. To get an idea of the kind of readings that you will get for distance without compensating for environmental factors have a look at my presentation: "Factors effecting positional accuracy of iBeacons", that is based on Estimote iBeacons, but should be relevant for other brands as well, but you will need to do your own experiments to work out the relative errors. I was seeing distance readings that were +-2M away from the real location.
My name is Wojtek Borowicz, I'm a community evangelist at Estimote.
To add to what Chris Thomson (BTW, cool slide deck!) - your first two question can basically be reduced to a single answer: you need your receiver to support Bluetooth Smart on both the hardware and software side. So yes, you need a Bluetooth 4.0 module to receive Bluetooth 4.0 signal and you also need a Bluetooth 4.0 stack for your receiver to be able to 'interpret' that signal.
I'm using my iPhone to scan in a complex 2D barcode. Problem is, the iPhone camera doesn't do so well at very close distances (less than 3 inches).
I was wondering if there were a way I could affix a Bluetooth low energy "sticker" to a piece of paper. The idea being instead of using the camera to scan a 2D barcode, I could just put my iPhone near the paper and "scan" it.
I'm extremely new to Bluetooth tech, so it's quite possible that what I'm asking for is completely ridiculous. Please forgive me, if that is the case.
Unlike NFC, Bluetooth Low-Energy devices need a power source, so it's imposible to just "print" them. They need a BLE chip and a battery to operate. So while you could use BLE same way you use NFC (proximity-based actions), you won't be able to do it with just a sticker.
Register at bluetooth sig for manufactorer id. Then put manufacturer id in advertisement package 0xff with id (16 bit) followed by the data. You must be sure your length is correct or iOS can't decode it.
For NFC, your scanner must be pretty close to the tag. But BLE devices work within several tens of meters without any problem. This is like an active RFID chip.
Of course, you need a power source for it. But if you print this BLE tag to a piece of expensive equipment, the cost of the tag and the battery is not a problem. You can use a button cell battery to power the BLE tag up. Let is broadcast/advertise some info once a second. Of course, you have to add some security mechanism if you want to be away from any replay attacks.