Trolley Scan(Pty) Ltd
Datasheet - Solar Powered UHF RFID reader
At the request of some farmers wanting to monitor their livestock in remote fields, Trolley Scan have developed a solar powered RFID reader that works in conjunction with the existing Eco-cattle(tm) eartags to provide a self contained RFID system with a 10 meter reading range. The system can be located in a distant location that does not have the conventional utilities such as power and communications.
Although solar power and batteries are well-known technologies, making a RFID reader that can work with these technologies has been a major challenge. A reader operating on solar power has to be able to handle serious power fluctuations when the solar batteries are discharged. The reader has to be able to sense the condition of the batteries, and when they hold sufficient energy, to restart the entire system and to re-establish communications with the remote computer systems. The reader has to send status messages in the dying and coming to life phases so that the remote computers are aware of the current status of readers.
Conventional battery technology and charging systems are not suitable as there might be long periods due to weather when there will not be sufficient solar energy to operate the system and the batteries might discharge to zero volts. To cater for these situations a special battery technology has to be used that can handle full discharge and even over-charge but still gives about a 20 year life.
The components of the reader had to be redesigned to handle lower operating voltage which is available from solar systems.
For communications we have made facilities to communicate either via cellphone networks OR point to point radio communications OR even via wire. The reader has to deal with the challenges of establishing communication, especially in the cellphone network situation where the network might be out of action.
Although this reader has been targeted at farmers both of cattle and wild game, it also has application in other situations where RFID systems are needed in remote situations where there are no power utilities.
The UHF reader works with the entire range of transponders that are made by Trolley Scan
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