HCSR04 and STM32 using Input Capture || Pulse width || CubeIDE

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Interface HCSR04 with STM32 using the Timer Input Capture Mode.
This method overcomes the errors that you were getting with the older method

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[kennygomez]

The pin A9 is connected to the Trig but in the main you define the A8 as Trig pin, I think it was a little confusion.
Great video!!

[mateusz]

Hello!
I have STM32 Nucleo L476RG. If you have problem like me that sensor doesn't measure anything or LCD is bombarded by random numbers here is solution, which worked for me.
1. Change these lines in your code to this:
#define TRIG_PIN GPIO_PIN_9
#define TRIG_PORT GPIOA

According to this video, TRIG should be connected do PA9 and ECHO to PA8. Remember that TRIG should be as GPIO_Output. On pin PA8 (to which is connected ECHO) you should make TIMER and enable option Input Capture mode.

2. Make sure that sensor is connected to 5 V DC.

3. Add this function to properly display values on your LCD:

void lcd_display_distance(uint8_t distance) {
char buffer[16];
sprintf(buffer, "Distance: %d cm", distance);
lcd_clear();
lcd_put_cur(0, 0);
lcd_send_string(buffer);
}

4. Make sure you add these lines in main:
MX_TIM1_Init();
MX_I2C1_Init();
/* USER CODE BEGIN 2 */
lcd_init();
HAL_TIM_IC_Start_IT(&htim1, TIM_CHANNEL_1);
lcd_send_string ("Dist= ");

5. In while make sure you have:
HCSR04_Read();
HAL_Delay(200);

And add this line too:


That's all worked for me. I hope that this comment will help you.
Greetings!

[noweare]

Excellent as always. I like the way you converted decimal to ascii. Thank you.

[shreyakaria]

Excellent video!! I tried this with my STM, the data is captured once and can only be updated when reset button is pressed, what to do?

[tupoy_ytub_uberi_psevdonim]

Hello! I like this video, to easy for learn. I make universal lib for any STM microcontroller. Big thanks!

[misterjacqwelll]

if i want to set a random number of the lcd, like push a button and save that value to calculate other values... You have a video to do that thing?

PD: Great video :3

[theraja]

Hi, Grt. Pls share tutorial on EEPROM Emulation on STM32F103C8T6 flash memory (Ref cd00165693) HAL Lib is there. thx

[minhcongho]

how to multiple input capture channels

[dorstern]

hey, there are two problems:
1. When the LCD reaches number more than 9 it shows A, how can I fix it?
2. The ultrasonic sensor fakes the distance measurement by 3 or 4 centimeters, do you have a solution for this?

[siurpussiurpuliukas]

If the distance if greater than 127 it Distance variable becomes negative number. How should I fix this?

[self-studyelectronicengine]

hi, thanks for this code
But I think this code has problem
you define PA8 as trig pin but put it on wrong way to use I try this code on my micro and change PA8 to PA9 as trig and coxe work it as well

[nsanandkumarak]

Hi Sir,

Can you please make video on Timer Tigger source and usage of it

[viethuynhquoc]

Hello, i have some problem with TCS3200, can you make a project about it. Thanks very much. I'm from Vietnam

[jhuqjbv]

is the header file of i2c is same for STM32F466RE? and i can't find your i2c header file. please help me...

[lorenefields]

Good video. I have a question. If I have a signal coming at 65 Hz, at what speed should I set the timer2 to read that signal in input capture mode. Thanks.

[DuyNguyen-tyuk]

I dont use lcd, how can i show distance on watch1

[davidbalog]

Distance is jumping rarely. I take an object 2 m away from the sensor, but it shows rarely bad value. What is the mistake?

[aniketsubudhi]

WHERE should i use the file lcd_userConf?

[monsieurovni]

Great job! But why would it not be possible to use HAL_delay() instead of delay() in HCSR04_Read() ?

[Levi.]

I have a question, if we apply to real life, what is the purpose of this project/