使用stm32采集0-10kHz频率0-10Vpp,0-24V直流偏置信号并给出原理图
时间: 2024-05-20 18:11:08 浏览: 23
对于0-10kHz频率的信号采集,可以使用STM32的定时器模块来实现。具体实现方法是将输入信号接入到STM32的定时器输入捕获通道(比如TIM1_CH1),在定时器捕获到信号的上升沿和下降沿时,通过计算两次捕获的时间差来得到信号的周期和频率。同时,可以通过定时器的PWM输出功能来产生一个固定频率的参考信号,用于对采集的信号进行同步采样。
对于0-10Vpp,0-24V直流偏置信号的采集,可以使用模拟电路来实现。一个常用的方案是将信号接入到一个带有电阻分压器的运放非反向输入端,将运放的反向输入端接地,通过调整电阻分压比例和运放的放大倍数,可以将输入信号放大到适合STM32 ADC输入的范围内。具体电路原理图如下:
![STM32采集电路原理图](https://img-blog.csdn.net/20180430100842514?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvb3VvbmdfY2hhdGJhY2s=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/q/80)
其中,R1和R2为电阻分压器,U1为运放放大器,C1为输入信号的直流偏置电容,C2为滤波电容,R3和R4为反馈电阻。注意,输入信号的直流偏置电压必须小于运放的供电电压范围。
相关问题
给出安捷伦33120A和EG&G 7260 DSP Lock-in Amplifier扫描音叉谐振子频率使用pyvisa库并绘图的python代码
以下是一个使用pyvisa库和matplotlib库的Python代码,可以通过安捷伦33120A和EG&G 7260 DSP Lock-in Amplifier扫描音叉谐振子频率并绘制图表。
```python
import visa
import time
import numpy as np
import matplotlib.pyplot as plt
# Connect to instruments
rm = visa.ResourceManager()
gen = rm.open_resource('USB0::0x0957::0x0407::MY44016679::INSTR')
lockin = rm.open_resource('GPIB0::1::INSTR')
# Configure function generator
gen.write('*RST')
gen.write(':SOUR:FUNC SIN')
gen.write(':SOUR:FREQ:MODE CW')
gen.write(':SOUR:VOLT:UNIT VPP')
gen.write(':SOUR:VOLT 2.0') # Set amplitude to 2 Vpp
gen.write(':OUTP ON')
# Configure lock-in amplifier
lockin.write('*RST')
lockin.write('HARM 1') # Set detection harmonic to 1
lockin.write('ISRC 1') # Set input to A
lockin.write('ICPL 0') # Set input coupling to AC
lockin.write('IGND 1') # Set input ground to FLOAT
lockin.write('SENS 22') # Set sensitivity to 1 nV/fA
lockin.write('OFLT 1') # Set time constant to 1 s
lockin.write('SYNC 0') # Set synchronous detection to OFF
# Scan frequency and measure output
freqs = np.linspace(1, 10000, 1000) # Scan frequencies from 1 Hz to 10 kHz
output = []
for freq in freqs:
gen.write(':SOUR:FREQ {:.6f}'.format(freq))
time.sleep(0.01)
lockin.write('REST') # Reset lock-in amplifier
time.sleep(0.1)
output.append(float(lockin.query('OUTP?'))) # Measure output
# Plot results
plt.plot(freqs, output)
plt.xlabel('Frequency (Hz)')
plt.ylabel('Output (V)')
plt.show()
# Disconnect from instruments
gen.write(':OUTP OFF')
gen.close()
lockin.close()
```
请注意,此代码仅供参考,可能需要根据实际情况进行调整。
使用stm32写一个波形发生器,包括正弦波、方波、三角波,频率范围为0.1kHz~10kHz,峰峰值范围为0.1Vpp~10Vpp。代码如何写
好的,这是一个关于使用STM32写一个波形发生器的问题,我很乐意为您解答。
以下是使用STM32实现波形发生器的步骤和代码示例:
1.配置TIM(定时器)模块,选择合适的时钟源,并设置计数器的重载值和分频系数,以实现所需的输出频率;
```c
TIM_HandleTypeDef htim2;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM2_Init(void);
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_TIM2_Init();
HAL_TIM_Base_Start(&htim2);
while (1)
{
}
}
void MX_TIM2_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
htim2.Instance = TIM2;
htim2.Init.Prescaler = 0;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 1000;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
}
```
2.编写波形生成函数,根据所选波形类型和参数,生成对应的波形信号;
```c
#define PI 3.14159265358979323846
float32_t sin_wave(float32_t frequency, float32_t amplitude, float32_t time)
{
return amplitude * sin(2 * PI * frequency * time);
}
float32_t square_wave(float32_t frequency, float32_t amplitude, float32_t time)
{
return amplitude * (2 * ((int)(2 * frequency * time) % 2) - 1);
}
float32_t triangle_wave(float32_t frequency, float32_t amplitude, float32_t time)
{
return amplitude * (2 * fabs(2 * frequency * time - 2 * floor(0.5 + 2 * frequency * time)) - 1);
}
```
3.在定时器中断中调用波形生成函数,将生成的波形信号输出到DAC(数模转换器)模块;
```c
#define DAC_BUF_SIZE 256
#define SAMPLE_RATE 100000
float32_t sin_buf[DAC_BUF_SIZE];
float32_t square_buf[DAC_BUF_SIZE];
float32_t triangle_buf[DAC_BUF_SIZE];
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
static uint16_t index = 0;
static uint16_t wave_type = 0;
static float32_t frequency = 1000;
static float32_t amplitude = 2047;
switch (wave_type)
{
case 0: // 正弦波
DAC_SetValue(sin_wave(frequency, amplitude, index * 1.0 / SAMPLE_RATE));
break;
case 1: // 方波
DAC_SetValue(square_wave(frequency, amplitude, index * 1.0 / SAMPLE_RATE));
break;
case 2: // 三角波
DAC_SetValue(triangle_wave(frequency, amplitude, index * 1.0 / SAMPLE_RATE));
break;
default:
break;
}
index++;
if (index >= DAC_BUF_SIZE)
{
index = 0;
}
}
void DAC_SetValue(float32_t value)
{
uint16_t output = (uint16_t)(value + 2048);
HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_R, output);
}
```
4.配置DAC(数模转换器)模块,将波形信号输出到外部电路中。
```c
DAC_HandleTypeDef hdac;
void MX_DAC_Init(void)
{
DAC_ChannelConfTypeDef sConfig = {0};
hdac.Instance = DAC;
if (HAL_DAC_Init(&hdac) != HAL_OK)
{
Error_Handler();
}
sConfig.DAC_Trigger = DAC_TRIGGER_T2_TRGO;
sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
if (HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
}
```
希望这个回答能够帮到您,如有疑问请继续提问。
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