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Author Topic: Cheap bluetooth remote controllers  (Read 1201 times)
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I have seen bluetooth dongles for as cheap as $US 3.  I am sure that I can buy them in bulk for as little as $1.50  3.7v and 5v relays are also cheap.  Can a bluetooth dongle be simply connected to a relay?  I have a couple of hobbies - hydroponics and raising fish -that would benefit greatly from being able to control lights, water pumps and drains remotely and with a timer.  I would not need to send a stream of data via bt but rather a signal that would contain the id for the bt device as well as a simple "on" and "off" command. 
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No, you can't just connect a USB/Bluetooth dongle to a relay.  If it were that easy they wouldn't be charging $140 for one.

http://www.relaypros.com/Relay/Device/R15PL_ZBT#.UV4lxL-qbr0
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The USB/Bluetooth dongle need driver from the PC to work, so it can't connect to relay directly.
You can use this JY-MCU HC-06 Bluetooth Wireless Serial Port Module with Attiny MCU to control a relay for less then $20
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