User manual

Robotics experiment with PIC microcontroller l 79
Another feature of automatic robots is that it can receive commands from a far
distance by using infrared light. This is similar to a remote-controlled robot except that the
commands received are through serial communication. Robo-PICA provides an Infrared
Remote control, called the ER-4. The ER-4 remote control will modulate serial data with
infrared light. Robo-PICA must first be installed with a 38kHz Infrared receiver module for
receiving.
7.1 ZX-IRM : Infrared Receiver module
The data transferedcwith Infrared Light can reach up to distnce of 5 to 10 meters
which is similar to TV remote control. The carrier frequency is 38kHz.The receiver must de-
modulate 38kHz carrier frequency. After this, it is then transferred as serial data to
microcontroller.
If the sensor does not detect the 38kHz frequency with the infrared light, the output
will be logic “1”. Otherwise, if it detects the 38kHz frequency, the output logic is “0”.
Figure 7-1 :Shows the photo of 38kHz Infrared Receiver module, pin assign-
ment and schematic diagram
3
1
2
Vc c
Out
GND
0.1uF
50V
Infrared Module
1 23
1
2
3
Out
GND
Vcc
Chapter 7
Robot with Remote control