Tagged Questions

2
votes
2answers
75 views

How to connect sensors to an Android device?

I need to build a device, which measures several parameters (body temperature, conductivity and pulse) and transmits them to an Android mobile device. The system has following parts: The sensors ...
2
votes
3answers
81 views

Wireless communications for distance estimation (RFID perhaps?)

What I want to do it is measure the distance between two points/ devices which are constantly moving apart or together. The value for distance isn't really required I'd just be looking to have an ...
0
votes
3answers
113 views

A device that wirelessly, securely posts to a server in response to door opening: off the shelf or custom-make?

I am looking for an off the shelf component for a project I am currently working on. Due to the nature of the project I cannot go into much detail about the project itself, only give a high level ...
4
votes
2answers
68 views

Xbee to act as wireless i/o extension

I want to have an arduino with an xbee (call it xbee1) connected to it and another wireless xbee (call it xbee2) communicating with xbee1. Then I would have DIO1 on xbee2 acting as a digital input and ...
0
votes
1answer
67 views

Calculating the model complexity for wireless sensors

I am coming from geoinformatic background and I do not know anything about the electrical issues. I have a model for outlier detection for wireless sensor and I want to assess the energy complexity ...
-2
votes
1answer
94 views

Need suggestions for amaster thesis on wireless sensor systems [closed]

I am going to write my master thesis on a wireless sensor network for a fire security system. The wireless protocol is decided and confidential, and has mesh capabilities for redundancy and great ...
0
votes
1answer
90 views

Bluetooth Interference between piconets

I am developing a device that consists of a base station and several wireless sensor nodes. In application there may be up to 30 of these devices in a laboratory with up to 5 sensor nodes ...
6
votes
1answer
269 views

Bluetooth vs Bluetooth Smart (Low Energy)

Im trying to decide between Bluetooth and Bluetooth LE. My device needs to transfer 375 bytes per second. Bluetooth LE can send packets of 20 bytes max, so this boils down to about 20 packets per ...
2
votes
2answers
189 views

technology to search small objects like pendrive, key-chains etc

I am a web developer by profession. few days back I lost 8gb pen-drive :( I don't it is in home or somewhere else.... So now I am thinking of a device which can be attached with small objects so that ...
3
votes
3answers
195 views

How to make any sensor a wireless one

I am try to build a wireless sensor(right now I am using an adxl335 accelerometer with an analog output) but this project should be general for any sensor that outputs analog. The issue is that I have ...
2
votes
4answers
192 views

Tracking pen within whiteboard surface

(Question in response to the comments.) I have a fixed flat white rectangular whiteboard of dimensions 1 meter by 0.5 meter and pen. I want to track the position of the tip of the pen within the ...
0
votes
1answer
115 views

What's the best comunication protocol for a sensor network?

What's the best comunication protocol for a fast and cheap wirelless sensor network? Is it one of these? WirelessHART IEEE 1451 ZigBee / 802.15.4 ZigBee IP 6LoWPAN Other
2
votes
1answer
273 views

Xbee traffic/bandwidth limitations for a real-time-ish application

I am planning on making a wireless sensor network with 4 Xbees going to 1 Coordinator. I want each of the sensor nodes to transmit continuously at ~5Hz. Is this feasible with Xbees? What sort of ...
2
votes
2answers
211 views

Which sensor nodes should I use?

I was asked to deploy a wireless sensor network and due to some requirements I already decided to use Zigbee/802.15.4 as my networking protocol. Also, I will be measuring air quality and taking some ...
2
votes
1answer
155 views

Is it possible to build something that can measure water and oil in a tank with out being in the tank?

Say you have water and oil in tank....Is there any thing out there that can tell me how much water is in the tank and how much oil is in the tank???
2
votes
4answers
493 views

wireless door opening detection

I need to find a way to detect when a door is opened and i want to register that through a wifi connection. So the 'door detection' module should send data to a PC over wifi when a door is opened. ...
4
votes
1answer
125 views

Should I shield digital sensors in close proximity to one another? If so, how?

Hi and thanks for looking! Background I am building a RC multicopter, the design of which has already been helped along greatly by members of this community! Thank you. On the underside of the ...
0
votes
2answers
661 views

Realtime Wireless Heart Rate Monitor

I'm familiar with Assembly/C/C++, so this question is focused on the hardware side. Context: I want to have a real time heart rate monitor so that I can see, on my computer screen, my heart beat. ...
9
votes
5answers
554 views

Fault modeling for embedded systems

I have a wireless sensor circuit with a microcontroller and a 2.4 GHz transceiver module, some integrated sensors with I²C interface, a UART port and the necessary discrete components. This board is ...
3
votes
2answers
115 views

Making mesh sensor networks energy efficient

SCENARIO: Say you have a mesh network of sensors that measure something like ambient temperature. The nodes are out of range of the base station; however, there happens to be one intermediate node ...
5
votes
3answers
507 views

Rather complicated sensor network

I was working on a project recently and it was the first one which was involved enough to make the sensor networking complicated. In the end, I think the communication was the bottleneck in terms of ...
1
vote
1answer
67 views

WTB (Build): Low power “proximity to a device” detector

I'd like to create a small device that can tell when it's near another created device or sensor. When it detects the other device, it lights up an LED. Maybe maximum detection range of a few feet. ...
2
votes
1answer
79 views

Modulation technique's effect on Active Sensor

Knowing that Bluetooth and ANT+ use FH-SS and ZigBee uses DS-SS, I would like to learn of the modulation technique's effects on a wireless point-to-point connection if I am implementing the wireless ...
8
votes
6answers
3k views

wireless temperature sensor

Are there any low-cost (<50$USD) wireless ambient temperature sensors available? I would like a simple to interface to the sensor i.e. IP over Wifi if at all possible.