In the circuit there are 5 push buttons connected to RA0, RA1, RA3, RA4 and RA5 which means that pins must be configured as inputs and the PWM pin as output. The internal oscillator is used and set to 8MHz with PLL enabled (8 x 4 = 32MHz). #use pwm (PWM1, FREQUENCY = 38KHz, DUTY = 25, PWM_OFF) The floowing CCS C line is used to configure the PWM module: The NEC protocol carrier frequency is 38KHz and to generate this frequency PIC12F1822 CCP module is used as a PWM module. This is the full code of microcontroller of the NEC IR transmitter. NEC Protocol IR transmitter (Encoder) using PIC12F1822 CCS PIC C code: PIC12F1822 internal pull-ups are enabled by the software and the internal oscillator is used as usual. The NPN transistor 2N2222 is used to drive the IR transmitter because the IR transmitter consumes high current and the microcontroller generally can’t provide that amount of current. The IR transmitter is the element that sends the IR signals to the IR receiver circuit. In the circuit there 5 push buttons and each button sends a different IR signal code. The following image shows the IR system transmitter circuit schematic diagram. NEC Protocol IR transmitter (Encoder) using PIC12F1822: Online Schematic and Circuit Diagram Tool.Microcontrollers and other Microchip devices Search tool.Find debuggers, programmers, compilers, adapters, socket modules and other accessories for your product.Pic16f877 based projects PIC Microcontroller PDF.Pic16f72 microcontroller based Project List” is locked Pic16f72 microcontroller based Project List.Online Courses to Learn Pic Microcontroller Programming.

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