I'm looking into making a small robot that will be Raspberry Pi controlled. One of the features I'd like to perform with the robot is moving to a certain area via infra-red sensors.
My plan is to have an IR emitter at one place and an IR receiver on the robot itself, and once the robot picks up a signal it will turn towards it.
The question that I have is about the hardware as I'm very (very very) bad with it.
I've found these receivers which look simple and cheap, 20Pcs IR Receiver Infrared Radiation Module 38kHz TSOP4838 DIP-3, although I'm not sure what the 38kHz would mean for a IR transmitter... does it simply mean it receiving waves with 38 kilohertz frequency?
One more thing that I've tried to get my head around is the transmitter (or emitter?) I've tried looking in the website I've linked to above (http://www.banggood.com/) for a IR bulb to emit the signal for the robot to pick up but couldn't find any (there were a lot of strange looking boards. Isn't it just a bulb like on the remote?) If you can, please help me find compatible IR transmitter for the receivers above.