veysel gokdemir Something useful on electronics
STM32 example of how to use HC-SR04 Ultrasonic Distance Sensor. In this video, we will be using Timer gated mode, Timer Update Interrupt, trigger and commutation interrupts, global interrupts, GPIO, LCD and I2C. We will also be looking at HC-SR04 Library, LCD menu, reading echo signal time duration (tx_us) in microseconds and distance (dx_cm) in centimeters. You may download example source codes and the library by clicking the link below. Change default connections of HC-SR04 by using “hcsr04_userConf.h”. If you would like to use USART to transmit the sensor values, the parameter settings are the same as in previous video VN48.
Connections(default):
| STM32F407 | HC-SR04 |
| 5V | Vcc |
| PD13(GPIO_Output) | Trig |
| PE9(TIM1_CH1) | Echo |
| GND | Gnd |
| *TIM2 | *it is used for 10us trigger delay |
| *PD15(GPIO_Output) | *Blue led; it shows Echo signal status |
| LCD | |
| PB7(I2C1_SDA) | SDA |
| PB6(I2C1_SCL) | SCL |
| 5V | VCC |
| GND | GND |
| BUZZER | |
| PD14(GPIO_Output) | IO |
| 3V | VCC |
| GND | GND |
| USB RS232 TLL | |
| PA2(USART2_TX) | Rx |
| PA3(USART2_RX) | Tx |
| <<SourceCode>> | Download |
