Atmega16 Modem

You can connect to smart devices such as iPhones, Android, or laptops via the headphone jack with this library. You can find more information here.

Resource Usage

This library requires the following microcontroller resources to work:

• Timer 1: Frequency timing
  • Timer 1A: for timing the received frequencies
  • Timer 1B: for timing the transmitted frequencies
• PB2 (AIN0): The frequency input port of the speaker bus
• PA2 (ADC2): Constant voltage input port for comparison with input frequency voltage
• PD4 (OC1B): Output frequency port to the microphone bus
• Timer 1 Input Capture Interrupt
• Timer 1 Compare Match Interrupt A
• Timer 1 Compare Match Interrupt B

Usage

In this code example, we echo the incoming messages back to the smart device.

#include <avr/io.h>
#include <avr/interrupt.h>
#include <modem.h>

void on_receive_msg(const char *msg, uint8_t size) {
	modem_snd_async(msg, size);
}

int main(void) {
	sei();
	modem_lsn(on_receive_msg);
	while(1);
}

Schematic

License

The project is licensed under the GPLv3.