The latest radar moduleRd-04from Anxinke has been released, but everyone is still confused. How should Rd-04 be used?        I believe everyone is quite concerned about this issue. This tutorial will provide a detailed introduction to the usage of Rd-04.

Rd-04 leads a total of 6pin 2.0mm row pins, with the following pins：

Attention: This article requires the use of I2C pins, so before formal wiring, the onboard MCU of Rd-04 needs to be removed. The location of the MCU is as follows:

In this STM32 project, the wiring to Rd-04 is as follows:

In order to facilitate faster implementation of functions, we have developed a driver library. You only need to write the I2C driver and it will work:

• Rd-04 I2C enables IO function, and the I2C function of Rd-04 requires IIC_ The EN pin can only be used after being pulled up, using STM32 as an example，HAL_GPIO_WritePin(GPIOA,GPIO_PIN_3,GPIO_PIN_SET)，HAL_GPIO_WritePin(GPIOA,GPIO_PIN_3,GPIO_PIN_RESET)
• I2C Send Start Signal Function
• I2C Send stop signal function
• I2C Host waiting for ACK response function
• I2C Send Byte Function
• I2C Read byte function, this function needs to come with whether to send ACK parameters to the slave
• Subtle delay function

After completing the development of the driver, replace the original one, such as:

#define AXK_RD04_I2C_ENABLE HAL_GPIO_WritePin(GPIOA,GPIO_PIN_3,GPIO_PIN_SET)
#define AXK_RD04_I2C_DISABLE HAL_GPIO_WritePin(GPIOA,GPIO_PIN_3,GPIO_PIN_RESET)

#define AXK_RD04_I2C_START I2C_start()
#define AXK_RD04_I2C_STOP I2C_stop()
#define AXK_RD04_I2C_WAITACK I2C_wait_ack()
#define AXK_RD04_I2C_SEND(byte) I2C_send_byte(byte)
#define AXK_RD04_I2C_READ(ack) I2C_read_byte(ack)
#define AXK_RD04_DELAY_us(us) delay_us(us)

Because Rd-04 cannot output real-time detection data, only the high and low levels of IO output are available, so all we can do is to detect the 'OUT' pin output of Rd-04. Running results:

void axk_rd04_default_config(void)

Rd-04 factory default configuration, the configuration parameters in it are not recommended to be modified. It is recommended to use other functions to modify the configuration

void axk_rd04_display_config(void)

Output printing configuration results, requiring support for pinrtf printing output

void AxkRd04SetIoValOutput(uint8_t OutputStatus)

Set the output level of IO VAL, which is the level that should be output when the target is detected. The default output is high

void AxkRd04SetWayOfWorking(rd04_psm_t PSM)

Configure the power supply mode, which defaults to intermittent power supply, i.e. low power consumption mode

void AxkRd04SetADCSamplingFrequency(rd04_adc_sf_t ADC_SF)

Configure ADC sampling frequency, default to 1KHz, available in 1KHz, 2KHz, 4KHz, and 16KHz options

void AxkRD04SetTransmittingPower(rd04_tpower_t Tpower)

Configure transmission power. Default RD04_TPOWER_ 5, i.e. 0x45, with 8 options available: RD04_TPOWER_0~RD04_TPOWER_7

void AxkRD04SetInductionThreshold(uint16_t IndTs)

Configure sensing threshold, default：0x15a

void AxkRD04SetNoiseUpdate(uint16_t noiseupdate)

Configure update noise threshold, default：0x0155

void AxkRD04SetInductionDelayTime(uint32_t _delay_ms)

Configure delay time in units：ms.default100ms

void AxkRD04SetBlockadeTime(uint32_t _delay_ms)

Configure lock time, unit:：ms.default1000ms

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