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Example

V to Hz 2 click

Rating:

5

Author: MIKROE

Last Updated: 2018-08-20

Package Version: 1.0.0.0

Example: 1.0.0.0

Category: Measurements

Downloaded: 4154 times

Not followed.

License: MIT license  

V to Hz 2 click is a device that converts an analog voltage input signal into a pulse wave signal of a certain frequency.

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  • mikroSDK Library 2.0.0.0
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Example Blog

V to Hz 2 click

V to Hz 2 click

Native view of the V to Hz 2 click board.

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V to Hz 2 click

V to Hz 2 click

Front and back view of the V to Hz 2 click board.

View full image

Library Description

Library initializes and defines GPIO driver and performs commands that can enable or disable the device and get frequency (FOUT) by getting the state of the INT pin. For more details check the documentation.

Key functions :

  • void vtohz2_enable( uint8_t state ) - The function performs enabling and disabling of the device.
  • uint8_t vtohz2_getFreqOut( void ) - The function gets the out frequency on mikrobus INT pin.

Example description

The application is composed of three sections:

  • System Initialization - Initializes peripherals and pins.
  • Application Initialization - Initializes GPIO driver, performs the device enable and sets the pwm frequency. Also writes help with the possible instructions.
  • Application Task - (code snippet) - Checks which command be entered on UART and sets the pwm duty cycle depending on the entered command.
void applicationTask()
{
 if (UART_Rdy_Ptr())
 {
 rxDat = UART_Rd_Ptr();

 if ((rxDat == '+') && (percCheck < 100))
 {
 pwmDutySum += onePercPwm;
 percCheck += 1;
 }
 else if ((rxDat == '-') && (percCheck > 0))
 {
 pwmDutySum -= onePercPwm;
 percCheck -= 1;
 }
 else if ((rxDat == '*') && (percCheck <= 90))
 {
 pwmDutySum += tenPercPwm;
 percCheck += 10;
 }
 else if ((rxDat == '/') && (percCheck >= 10))
 {
 pwmDutySum -= tenPercPwm;
 percCheck -= 10;
 }
 else if (rxDat == 'h')
 {
 vtohz2_writeHelp();
 }

 pwmDuty = pwmDutySum;
 vtohz2_setSpeed( pwmDuty );

 mikrobus_logWrite( "PWM Duty is : ", _LOG_TEXT );
 WordToStr( percCheck, text );
 mikrobus_logWrite( text, _LOG_TEXT );
 mikrobus_logWrite( " %", _LOG_LINE );
 }
}

Additional functions :

  • void vtohz2_writeHelp() - Writes instructions that perform the determined commands.
  • void vtohz2_setSpeed( uint16_t pwm_duty ) - Determines the desired pwm duty cycle and checks the limit of the pwm duty.
  • void vtohz2_pwmInit( uint32_t pwm_freq ) - Initializes the PWM with the desired frequency and calculates the maximal value of the pwm duty cycle.


Other mikroE Libraries used in the example:

  • Conversions
  • PWM
  • UART

Additional notes and information

Depending on the development board you are using, you may need USB UART clickUSB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

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