I have 5 gates and a moving car. I would like to know in which gate the rc car just past by. The gates does not have a power source. First I thought I can use rfid to identify the gate number from the car, however this requires to much power in order to read the passive tags from a 20cm distance. The other idea is to use something like the bar-code scanner with my arduino. Can anybody recommends other easy to implement solution on an arduino?
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\$\begingroup\$ UHF (ultra high frequency) RFID tags and readers are used in a such scenarios (passive tags, some readers can read from 10 or more meters apart, typical ~5m) \$\endgroup\$– FlankerApr 23, 2017 at 13:16
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\$\begingroup\$ "I would like to know in which gate the rc care just past by" - why? \$\endgroup\$– Bruce AbbottApr 24, 2017 at 5:15
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\$\begingroup\$ Multicopter racers use infrared LEDs transmitting a code to grounded receivers with success, for a similar application. A similar system could be adapted for RC cars, albeit the gates wouldn't be passive. \$\endgroup\$– jmsApr 24, 2017 at 10:38
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I've used RFID sensors and tags in a product. The RF tags we used are for short-range stuff. The UHF tags are used for detecting objects from further away, such as containers on lorries from 15 m away.
The UHF readers are off-the-shelf and readily available. You will get a code from each tag so you can tell vehicles apart.
The downside is that the readers are expensive. You don't mention a budget so I'll leave you to weigh this up.
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\$\begingroup\$ Thank for your help. This is an RC car hobby project. \$\endgroup\$– MokusApr 23, 2017 at 13:25
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1\$\begingroup\$ @OHLÁLÁ, right...you probably can't afford £100s, then. Unfortunately, you question says car and gates, generally meaning motor car and large barriers. Best you detail the question far more, then: why you're doing this, diagram with sizes, what a 'gate' is, how much you can afford. A lot of paragraphs - the opposite of 'sketchy'. \$\endgroup\$– TonyMApr 23, 2017 at 15:13