Hexabitz PD Temperature Controller

Controlling temperature with PD using thermoelectric and modular Hexabitz H0FR7.

IntermediateFull instructions provided4 hours356

Things used in this project

Hardware components

Hexabitz H0FR7

ntc thermistor

Peltier tec1-12706

Software apps and online services

MATLAB

polyfit values for NTC loookup table

Hand tools and fabrication machines

Power Supply, Soldering Station

Story

Introduction:

One of the most important thing in the automation application is controlling heat, each factory has a system which is needed to control the temperature.

There is a special device to do this process depending on the PID controller algorithm but why we should buy those stuff whereas we can make it by myself.

STEPS:

1_ Make an equation for your NTC sensor to get the right reading for temperature.

(note: maybe you have to follow more than one equation because of nonlinear for NTC)

2_ Make your controller using the main equation PD:

1 / 2

3_ Create a suitable chamber for heating the required material, pay attention to isolate the cold part from the heat part.

4_ Finally put all components together then write the code with Keil uVision.

note: I added a sensor on the port 2 Tx(top) this pin is connected to ADC channel 2 instead of UART.

I talked a sample per second using timer3 that will trigger the ADC.

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc) 
{
 
	rawValues=HAL_ADC_GetValue(hadc);
	
	c_temp=calc_ntc(rawValues);
	
	error_t=d_temp-c_temp;
	
	pwm_ntc=pd_ntc(error_t);
	
	Relay_PWM(pwm_ntc);

  //IND_toggle();
	
}

_USE Voltage divider to read thermistor NTC between 0 to 3V3.

main.c

/**
  ******************************************************************************
  * File Name          : main.c
  * Description        : Main program body
  ******************************************************************************
  *
  * COPYRIGHT(c) 2015 STMicroelectronics
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */
	
/*
		MODIFIED by Hexabitz for BitzOS (BOS) V0.2.3 - Copyright (C) 2017-2020 Hexabitz
    All rights reserved
*/

/* Includes ------------------------------------------------------------------*/
#include "BOS.h"


/* Private variables ---------------------------------------------------------*/

  uint32_t rawValues;
	float c_temp,error_t;
	float d_temp=40;
	uint8_t pwm_ntc;
	//uint32_t fr=1000;
	uint8_t pwm_ntc1=50;

	uint8_t out;
/* Private function prototypes -----------------------------------------------*/
void MX_ADC_Init(void);
void MX_TIM1_Init(void);
void Error_Handler(void);
ADC_HandleTypeDef hadc;
TIM_HandleTypeDef htim1;

float calc_ntc(int x);
uint8_t pd_ntc(float e);
/* Main functions ------------------------------------------------------------*/

int main(void)
{


  /* MCU Configuration----------------------------------------------------------*/

  /* Reset all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* Configure the system clock */
  SystemClock_Config();

  /* Initialize all user peripherals */
	

	

	/* Initialize BitzOS */
	BOS_Init();
	MX_ADC_Init();
  MX_TIM1_Init();
  /* Call init function for freertos objects (in freertos.c) */
  MX_FREERTOS_Init();

  /* Start scheduler */
  osKernelStart();
  
  /* We should never get here as control is now taken by the scheduler */

  /* Infinite loop */
  while (1)
  {


  }


}



/*-----------------------------------------------------------*/

/* User Task */
void UserTask(void * argument)
{

	HAL_TIM_Base_Start(&htim1);
	HAL_ADC_Start_IT(&hadc);
  /* Infinite loop */
  for(;;)
  {
		

	}
}


void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc) 
{
 
	rawValues=HAL_ADC_GetValue(hadc);
	
	c_temp=calc_ntc(rawValues);
	
	error_t=d_temp-c_temp;
	
	pwm_ntc=pd_ntc(error_t);
	
	Relay_PWM(pwm_ntc);

  //IND_toggle();
	
}

float calc_ntc(int x)
	{
		
		
		float rout=20000,vin=3.3,a=13,b=-1762,c=0,creal;
			
		
		float dec,vout,rth,del,cc;
		dec=(float) x;
		vout=dec*(3.3/4095);
		rth=rout*((vin/vout)-1);
		
				if(dec<2100) c=57000;
				else if(dec>2100 && dec<3000) c=59128;
		    else if(dec>3000) { c=60000; }
				else c=59128;
		
		cc=c-rth;
		del=(b*b)-4*a*cc;
		//if(del<0) {del=-del; }
		creal=(-b-sqrt(del))/(2*a);
		if(dec>3500)
			creal=creal+7;
		return creal;
		
	}

	uint8_t pd_ntc(float e)
	{
		float e_1=0,del_e;
		float p=500,d=10;
		 
		
		del_e=e-e_1;
		
		if(e>0 && del_e<0)
		out=e*p+del_e*d;
		else if(e<0)
		out=0;
		else
		out=e*p;
		
		e_1=e;
		if(out<1) out=0;
		else if(out>100) out=100;
		return out;
	}

/*-----------------------------------------------------------*/

/************************ (C) COPYRIGHT HEXABITZ *****END OF FILE****/


/* ADC init function */
void MX_ADC_Init(void)
{
  ADC_ChannelConfTypeDef sConfig = {0};

  /** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) 
  */
  hadc.Instance = ADC1;
  hadc.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
  hadc.Init.Resolution = ADC_RESOLUTION_12B;
  hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
  hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc.Init.LowPowerAutoWait = DISABLE;
  hadc.Init.LowPowerAutoPowerOff = DISABLE;
  hadc.Init.ContinuousConvMode = DISABLE;
  hadc.Init.DiscontinuousConvMode = DISABLE;
  hadc.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_TRGO;
  hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
  hadc.Init.DMAContinuousRequests = DISABLE;
  hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
  if (HAL_ADC_Init(&hadc) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure for the selected ADC regular channel to be converted. 
  */
  sConfig.Channel = ADC_CHANNEL_2;
  sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
  sConfig.SamplingTime = ADC_SAMPLETIME_71CYCLES_5;
  if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }

}

void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{

  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(adcHandle->Instance==ADC1)
  {
  /* USER CODE BEGIN ADC1_MspInit 0 */

  /* USER CODE END ADC1_MspInit 0 */
    /* ADC1 clock enable */
    __HAL_RCC_ADC1_CLK_ENABLE();
  
    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**ADC GPIO Configuration    
    PA0     ------> ADC_IN0 
    */
    GPIO_InitStruct.Pin = GPIO_PIN_2;
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* ADC1 interrupt Init */
    HAL_NVIC_SetPriority(ADC1_COMP_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(ADC1_COMP_IRQn);
  /* USER CODE BEGIN ADC1_MspInit 1 */

  /* USER CODE END ADC1_MspInit 1 */
  }
}

void HAL_ADC_MspDeInit(ADC_HandleTypeDef* adcHandle)
{

  if(adcHandle->Instance==ADC1)
  {
  /* USER CODE BEGIN ADC1_MspDeInit 0 */

  /* USER CODE END ADC1_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_ADC1_CLK_DISABLE();
  
    /**ADC GPIO Configuration    
    PA0     ------> ADC_IN0 
    */
    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_0);

    /* ADC1 interrupt Deinit */
    HAL_NVIC_DisableIRQ(ADC1_COMP_IRQn);
  /* USER CODE BEGIN ADC1_MspDeInit 1 */

  /* USER CODE END ADC1_MspDeInit 1 */
  }
} 

//////////////////////


/* TIM1 init function */
void MX_TIM1_Init(void)
{
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};

  htim1.Instance = TIM1;
  htim1.Init.Prescaler = 24000-1;
  htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim1.Init.Period = 2000-1;
  htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim1.Init.RepetitionCounter = 0;
  //htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }

}

void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* tim_baseHandle)
{

  if(tim_baseHandle->Instance==TIM1)
  {
  /* USER CODE BEGIN TIM1_MspInit 0 */

  /* USER CODE END TIM1_MspInit 0 */
    /* TIM1 clock enable */
    __HAL_RCC_TIM1_CLK_ENABLE();

    /* TIM1 interrupt Init */
    HAL_NVIC_SetPriority(TIM1_CC_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(TIM1_CC_IRQn);
  /* USER CODE BEGIN TIM1_MspInit 1 */

  /* USER CODE END TIM1_MspInit 1 */
  }
}

void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* tim_baseHandle)
{

  if(tim_baseHandle->Instance==TIM1)
  {
  /* USER CODE BEGIN TIM1_MspDeInit 0 */

  /* USER CODE END TIM1_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_TIM1_CLK_DISABLE();

    /* TIM1 interrupt Deinit */
    HAL_NVIC_DisableIRQ(TIM1_CC_IRQn);
  /* USER CODE BEGIN TIM1_MspDeInit 1 */

  /* USER CODE END TIM1_MspDeInit 1 */
  }
} 



void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */

  /* USER CODE END Error_Handler_Debug */
}

Credits

Abd Alrhman Hammal

5 projects • 13 followers

firmware programmer

Hexabitz PD Temperature Controller