How far away from your base computer do the terminals need to be? Does it need to be a relatively real-time system or can the check-ins be cached for a few seconds?
If you could get away with the range of wifi, and the potential latency of an mqtt message (a good protocol if you need QOS) I think an esp8266 microcontroller with one of the these RFID ...
One solution I have seen and I could recommend is to divide your warehouse in areas and create gateways for accessing to them with the forklift or trucks. Then you setup the antennas on those gateways and force the drives to pass through them in order to track the goods movement.
Basically it is the same logic behind any shop store with those RFID ...
I think the least expensive technology that exists in this arena is active RFID. But the definition of expensive is best left to the user. A company called Monnit has active rfid tags and sensors directly targeted at livestock assets. Still only has a 250 ft NLOS range, but it's hard to know what the LOS range is without putting a sensor up a pole. Since the ...
It is important to identify whether the problem is :
Devices or network deployment
Devices or network configuration.
Devices Hardware (or firmware versions)
The paths to take here are too diverse so you need to narrow
down the cases.
Sometimes a photo helps to spot the possible deployment issues.
Here are some ideas:...
I myself was just working on a similar project, so I may be of some help. The first thing that we need to consider is the budget. Since you mentioned cheap, I am going to try and keep the budget below $3.
For a project like this, I would recommend using a dedicated WiFi module and a dedicated humidity + temperature sensor. This way, the project is more ...
My solution to this was to use ESP8266 boards with various temp sensors like a TMP102 or LM75A. The ESP chips then send their data using MQTT to a Pi which is running Home Assistant.
Here are some links that might help:
If you are planning to use cheap android tablets, you should do some survey to understand what technologies are possible options for authentication. Besides wifi and bluetooth connectivity, most of the tablets have USB OTG host connector and with some cable you should be able to attach USB authentication dongle. Or if security is not a big issue in your case,...
You can consider attaching pcProx® Plus RFID readers with the machines, 1 per machine. You can use RDR-80581AK8 SKU. It is powered by 5V external power supply and supports RS232 for sending data in ASCII format.
Possibly cheaper than a tablet would be a Raspberry Pi and a USB NFC reader or a NFC Hat.
It's not clear what you mean by machine, but if you mean just another computer then both Linux and Windows will authenticate via NFC directly without the need for a tablet/pi/other device, just a USB NFC reader.
I have used EPC GEN2 [EPC865-868 MHz(Europe), 902-928 MHz(USA)] technology for an automated document management system. You can find long distance antennas on the market. For example - GAO RFID can be good
Tags supported by such a system can be found everywhere, including Alibaba.com and Amazon.com. Tags can be active or passive so you can choose ...
As always with a wireless solution, the critical parameters for selecting a solution are required range and power consumption.
You might be able to identify a cheaper pair of sensors, or even find a MCU which is integrated with the sensors you need (and a radio) if you're lucky.
The sensors you found seem to simply broadcast digital data continuously, so ...
If you're worried about the cost of scaling the system to large numbers of livestock, then keep the equipment off the livestock.
Send a drone with a camera overhead periodically. Livestock need to be optically distinguishable from the surrounding ground.
Multiple cameras up on poles. Computer provides triangulation. The more height, the better. You get ...
Using RFIDs will be very costly for such large coverage area. It will require a bulkier system. It will be better if you use LoRaWAN. This technology being cheap, low powered, long transmission range capability and durability of more than 10 years will be very helpful in your use case. You can attach LoRaWAN receivers on your livestock and setup the main ...
Congratulations on writing a research paper on it.
This can be done with streaming platforms such as kafka or AWS KDA (kinesis data analytics). There are clauses in the query language in KDA (and also in KSQL, I think) which will allow you to link the events that happen very close together.
I think this is going to be a difficult problem to solve with the given constraints.
There are two main forms of "tags": active and passive.
Active "tags" may be RFID/NFC (on various frequencies), BLE beacons, UWB beacons, and more. They run on battery, and transmit a signal at regular intervals, which is then picked up by a receiver.
RFID (and not NFC) is the technology for you. For 2 ft (60 cm) range, you will need the more expensive "active" RFID tags & reader, rather than "passive".
For a board, go with what makes you comfortable. Raspberry Pi might be good for a novice, especially if you know Linux; the Pi Zero W has a WiFi interface and costs about US $9; more expensive ...
If someone needs an answer / solution for this query, I created a landing page of repositories that provides a complete End-To-End solution of a prototype of the application. Right from Arduino Sketch for the Sensors, as well as Backend API.
Landing Page: iotfablab/TrackNTrace
Also I have a written a scientific paper for it:
If you do not have ...
RFID card does not emit any electromagnetic signals when it is not close to a reader, it is designed to be passive. It is activated when brought in proximity to the reader. So RFID card cannot really damage your phone while it is in back case of you phone.