Published July 15, 2017 © GPL3+

Voice Over Sigfox Network?

A simple device featuring retro mechanical pulse dial and Sigfox connectivity.

IntermediateFull instructions provided5 hours1,595

Things used in this project

Hardware components

TD1208

TD1208 breakout

Adafruit Standard LCD - 16x2 White on Blue

Resistor 1M ohm

Capacitor 10 nF

rotary pulse dial from old telephone

Generic push button

generic battery holder

Software apps and online services

Losant Platform

Sigfox

Hand tools and fabrication machines

3D Printer (generic)

Story

Hallo!

I am really fascinated with old electro-mechanical dials from old phones. So I have got crazy idea to combine such dial with LCD and more interestingly with Sigfox connectivity (low power IoT network).

Function description

Function of device is pretty simple. Device is meant to be powered by 3 or 4x AA batteries therefore code is optimized for maximal power efficiency. Display is automatically turned off after 30s of inactivity.

User is asked for PIN number. Currently is PIN code hard-coded, but it is not problem to add functionality to change code by user or remotely over network (preferred).

User is asked to enter phone number:

In very last step, user is asked to enter "action code".

Each action is confirmed by "enter" a button.

Phone number and action code are transferred via Sigfox network to an application which initiate SMS/CALL with prepared text based on action code. Device can be simplified to send just action codes to trigger various actions, eg. 12 - watering of garden, 123-turn of electricity, 999-launch ballistic missiles, etc.

It could be very crude remote control.

Enclosure

My prototyping usually starts with enclosure so I draw simple enclosure in ThinkerCad and printed on my 3D printer. I know that is not probably pretty usual to start with enclosure but It motivates me to actually finish the product.

Thinker Cad Model

Electric design

The heart of device is TD1208 Sigfox Module which comes with possibility to write your own firmware in relatively easy manner. I have used my own TD1208 break out PCB (ioter.io) but original TD1208 EVB could be used as well.

Display 16x2 (HD44780) has to be 3.3V type or you have to use negative voltage source for VO pin of display in case of 5V type. In other cases text will be barely visible. I made in my case charge pump from 555 (plenty of schematics available online)

Display power is managed over GPIO pin TIM2 so in standby power consumption is about 4-5uA, in active mode about 7mA, during transmitting about 55mA.

Dialer used is probably Siemens type with four wires. I have managed found one which return pulses according number (n+1) and one which is closed during "pulsing". Adjustment of code will maybe necessary depending on your dialer.

Because pulses from mechanical contacts are very noisy there are needed some filtering. I have solved this problem by simple capacitor in series with bleed out resistor. That simple solution works 100%.

1 / 2

Application

For handling of incoming data from device I am using Losant IoT platform. Function of app is very simple and on internet are available many guides and examples so I will describe just general concept. There are two major functions

parsing of Sigfox payload

calling external http service providing SMS or Text to speech calls like Twilio or many others.

Losant workflow

Schematics

Code

/******************************************************************************
 * @file
 * @brief Dial - rotary dial with sigfox connectivitya
 * @author David Týr
 * @version 1.0.0
 ******************************************************************************
 
 ******************************************************************************/

#include <efm32.h>
#include <em_gpio.h>
#include <td_core.h>
#include <td_sigfox.h>
#include <td_gpio.h>
#include <td_measure.h>
#include <td_rtc.h>
#include <em_timer.h>
//#include <td_tools_led.h>
#include <td_tools_switch.h>


#include <td_uart.h>
#include <td_printf.h>
//#include <td_stream.h>

#include <LCD_HD44780_EFM32.h>



#define TD_GEOLOC_USE_CODE		0
#define TD_SCHEDULER_MAX_TIMER	5


/* This file declare all "dynamic" library data. It should be last included file
 * Standard size value can be override before including this file
 */



#define TD_GEOLOC_USE_CODE 0
#include <td_config.h>

/*******************************************************************************
 *************************   DEFINES   *****************************************
 ******************************************************************************/


#define PW_PORT			TIM2_PORT
#define PW_BIT			TIM2_BIT
#define Pulse_PORT	    SCL_PORT
#define Pulse_BIT		SCL_BIT
#define Pulse_MASK		SCL_MASK
#define PDONE_PORT		SDA_PORT
#define PDONE_BIT		SDA_BIT
#define PDONE_MASK		SDA_MASK
#define BUTTON_PORT		DAC0_PORT
#define BUTTON_BIT		DAC0_BIT
#define BUTTON_MASK		DAC0_MASK


/*******************************************************************************
 ******************************  CONSTANTS  ************************************
 ******************************************************************************/

/*******************************************************************************
 *************************   PRIVATE VARIABLES   *******************************
 ******************************************************************************/

/** Button event flag */
/** Timer ID */
uint8_t Timer_timeout = 0xFF;


uint8_t SW_pulse = 0;
uint8_t SW_button = 0;
uint8_t Pulse_count = 0;
uint32_t MyNum = 0;
uint32_t Phone = 0;
uint32_t Code = 0;
uint8_t Stage = 0; //0- off 1-PWD 2-dial 3-code
static bool Disp_ON = false;
static bool SendEvent = false;

static uint8_t frame[11];


uint32_t PWD = 123;
uint16_t Timeout = 30;


/*******************************************************************************
 *************************   PRIVATE FUNCTIONS   *******************************
 ******************************************************************************/



static int COMMIT(uint32_t arg, uint8_t repetition) {

	Pulse_count--;

	TD_SCHEDULER_Restart (Timer_timeout);

	char buffer[1];

	if (Pulse_count == 0) {
		Pulse_count = 0;
		//Pulse_start = true;
		//lcd_clrscr();
		MyNum = 0;
		Stage--;

		return 0;
	}

	if (Pulse_count > 10  ) {
			Pulse_count = 0;
			return 0;
		}

	if (Pulse_count == 10) {
		Pulse_count = 0;
	}

	sprintf(buffer, "%d", Pulse_count);


	if (Stage == 1) {
		lcd_puts("*");
	}
	else {
		lcd_puts(buffer);

	}

	MyNum = (MyNum * 10) +  Pulse_count;

	Pulse_count = 0 ;

	return 1;
}

static void PULSE(uint32_t mask)
{

		Pulse_count++;

		TD_RTC_Delay(100);
		GPIO_IntConfig(Pulse_PORT, Pulse_BIT, true, false, true);

	}

static void TURN_OFF(uint32_t arg, uint8_t repetition)
{
	Disp_ON = false;
	GPIO_PinOutClear(PW_PORT, PW_BIT);
	GPIO_PinOutClear(USR0_PORT, USR0_BIT);
	GPIO_PinOutClear(USR1_PORT, USR1_BIT);
	GPIO_PinOutClear(USR2_PORT, USR2_BIT);
	GPIO_PinOutClear(USR3_PORT, USR3_BIT);
	GPIO_PinOutClear(USR4_PORT, USR4_BIT);
	GPIO_PinOutClear(DB2_PORT, DB2_BIT);
	GPIO_PinOutClear(DB3_PORT, DB3_BIT);

}


/*******************************************************************************
 **************************   PUBLIC FUNCTIONS   *******************************
 ******************************************************************************/



/***************************************************************************//**
 * @brief
 *   User setup function.
 ******************************************************************************/
void TD_USER_Setup(void)
{

	  // Initialize printf() to work with the LEUART
	 //     init_printf(TD_UART_Init(9600, true, false),
	  //    		TD_UART_Putc,
	   //   		TD_UART_Start,
	    //  		TD_UART_Stop);
	     // tfp_printf("START\r\n");

	  	// If using DB2/DB3
	    GPIO_DbgSWDIOEnable(false);
	    GPIO_DbgSWDClkEnable(false);

		 TD_RTC_Delay(10000);


			// Define the button pin as an input with an internal pull-up resistor
				GPIO_PinModeSet(PW_PORT, PW_BIT, gpioModePushPull, 0);
				GPIO_DriveModeSet(PW_PORT, gpioDriveModeHigh);




		int type;
		IRQn_Type irq_parity;


	// Define the button pin as an input with an internal pull-up resistor
		GPIO_PinModeSet(Pulse_PORT, Pulse_BIT, gpioModeInputPull, 1);

		// Set up a user hook on button pin interrupt
		type = (Pulse_MASK & TD_GPIO_ODD_MASK) ?
		TD_GPIO_USER_ODD : TD_GPIO_USER_EVEN;
		TD_GPIO_SetCallback(type, PULSE, Pulse_MASK);

		// Enable falling edge and rise interrupts on button pin
		GPIO_IntConfig(Pulse_PORT, Pulse_BIT, true, false, true);

		// Clear and enable the corresponding interrupt in the CPU's Nested Vector
		// Interrupt Controller
		irq_parity =
					(Pulse_MASK & TD_GPIO_ODD_MASK) ? GPIO_ODD_IRQn : GPIO_EVEN_IRQn;
		NVIC_ClearPendingIRQ(irq_parity);
		NVIC_EnableIRQ(irq_parity);









		// Push button initialization
		SW_pulse = TD_TOOLS_SWITCH_Init(PDONE_PORT, PDONE_BIT, gpioModeInputPull, true, true, 10, 3, 10);
		SW_button = TD_TOOLS_SWITCH_Init(BUTTON_PORT, BUTTON_BIT, gpioModeInputPull, true, true, 1, 3, 10);

		// Interrupt handling
		TD_TOOLS_SWITCH_Start(SW_pulse);
		TD_TOOLS_SWITCH_Start(SW_button);







}

/***************************************************************************//**
 * @brief
 *   User loop function.
 ******************************************************************************/
void TD_USER_Loop(void)
{
	// buttons handling
					switch (TD_TOOLS_SWITCH_Process(SW_pulse)) {
						case TD_TOOLS_SWITCH_SHORT_RELEASED:
							 COMMIT(0,0);
							break;

					default:
						break;
					}

					switch (TD_TOOLS_SWITCH_Process(SW_button)) {
						case TD_TOOLS_SWITCH_SHORT_RELEASED:



							if (!Disp_ON) {
								TD_SCHEDULER_Restart (Timer_timeout);
								Timer_timeout = TD_SCHEDULER_Append(Timeout, 0 , 0, TD_SCHEDULER_ONE_SHOT, TURN_OFF, 1); //timeout start
								GPIO_PinOutSet(PW_PORT, PW_BIT);
								TD_RTC_Delay (5000);
								lcd_init(LCD_DISP_ON_CURSOR_BLINK);

								Stage = 0;
								MyNum = 0;
								Pulse_count = 0;

								Disp_ON = true;
							}


							switch (Stage) {

							case 1:
								if (MyNum == PWD) {
									lcd_clrscr();
									lcd_home();
									 lcd_command(0x0C);
									lcd_puts("OK");

									TD_RTC_Delay (T1S);
									lcd_command(0x0F);
									Stage = 2;
								}
								else {
									lcd_clrscr();
									lcd_home();
									lcd_puts("WRONG PIN!!");

									TD_RTC_Delay (T3S);
									 MyNum =0;
									Stage = 0;
								}
							break;

							case 3:
								Phone = MyNum;
								lcd_clrscr();
								lcd_home();
								lcd_command(0x0C);
								lcd_puts("OK");
								TD_RTC_Delay (T1S);
								lcd_command(0x0F);
								Stage = 4;

							break;


							case 5:
								Code = MyNum;
								lcd_clrscr();
								lcd_home();
								lcd_command(0x0C);
								lcd_puts("TRANSMITTING...");
								SendEvent = true;

							break;

							}

						break;

					default:
						break;
					}

	if (Disp_ON) {

		switch (Stage) {

		case 0:
			lcd_clrscr();
			lcd_home();
			lcd_puts("Enter your PIN");
			MyNum = 0;
			Stage = 1;
			lcd_gotoxy(0,1);
		break;


		case 2:
			lcd_clrscr();
			lcd_home();
			lcd_puts("Phone number?");
			lcd_gotoxy(0,1);
			MyNum = 0;
			Stage = 3;
		break;

		case 4:
			lcd_clrscr();
			lcd_home();
			lcd_puts("Action code?");
			lcd_gotoxy(0,1);
			MyNum = 0;
			Stage = 5;
		break;
		}
	}

	if (SendEvent) {


				// Send the single byte counter to the SIGFOX network
				unsigned int volt = TD_MEASURE_VoltageTemperatureExtended(false);



				frame[1] = ( volt >> 8 ) & 0xff;
				frame[2] = ( volt ) & 0xff;
				frame[3] = ( Phone >> 24 ) & 0xff;
				frame[4] = ( Phone >> 16 ) & 0xff;
				frame[5] = ( Phone >> 8 ) & 0xff;
				frame[6] = ( Phone ) & 0xff;
				frame[7] = ( Code >> 24 ) & 0xff;
				frame[8] = ( Code >> 16 ) & 0xff;
				frame[9] = ( Code >> 8 ) & 0xff;
				frame[10] = ( Code ) & 0xff;



				TD_SIGFOX_Send(frame, 11, 0);

				SendEvent = false;


				lcd_clrscr();
				lcd_home();
				lcd_command(0x0C);
				lcd_puts("DONE!!!");
				TD_RTC_Delay (T5S);
				TD_SCHEDULER_Remove (Timer_timeout);
				TURN_OFF (0,0);

			}

}

Credits

David Týr

0 projects • 4 followers

An open-minded technological enthusiast who would like to taste everything new. In his free time, he loves to make own DIY projects.

Voice Over Sigfox Network?

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Function description

Enclosure

Electric design

Application

Custom parts and enclosures

enclosure TOP

enclosure BOTTOM

Schematics

Schematics

Code

Main code

LCD_HD44780_EFM32.h

LCD_HD44780_EFM32.c

Credits

David Týr

Comments

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Voice Over Sigfox Network?

Voice Over Sigfox Network?

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Function description

Enclosure

Electric design

Application

Custom parts and enclosures

enclosure TOP

enclosure BOTTOM

Schematics

Schematics

Code

Main code

LCD_HD44780_EFM32.h

LCD_HD44780_EFM32.c

Credits

David Týr

Comments

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