stm32 esp32 adc dac数据记录

使用数字电源Riden  RD6024 输出24v的直流电源

esp32 自带adc（12bit）实测数据：

理论分辨率：3.3V/4096   （默认不衰减，配置衰减系数以扩大量程范围，但是会损失精度）

ESP32芯片的ADC模块提供了不同的衰减系数，以适应不同的输入电压范围。以下是ESP32可用的ADC衰减系数列表：

ADC_ATTEN_DB_0：不衰减，输入电压范围为0到1.00V。
ADC_ATTEN_DB_2_5：衰减2.5dB，输入电压范围为0到1.34V。
ADC_ATTEN_DB_6：衰减6dB，输入电压范围为0到2.00V。
ADC_ATTEN_DB_11：衰减11dB，输入电压范围为0到3.60V。
您可以使用analogSetAttenuation()函数来设置ADC的衰减系数。例如，以下代码将ADC的衰减系数设置为11dB：

Copy
analogSetAttenuation(ADC_ATTEN_DB_11);
需要注意的是，衰减系数越大，输入电压范围就越大，但ADC的精度也会降低。默认情况下，ESP32的ADC精度为12位，但在使用ADC_ATTEN_DB_11衰减系数时，ADC的精度将降低为11位。因此，在选择衰减系数时，需要权衡电压范围和ADC精度之间的关系。

 使用正点原子数字可调电源DP100输出12v直流，使用0603电阻分压，（1/1+11k）

输入电压纹波：（10mv）

在11db的衰减情况下，测量范围0-3.6v，数据如下（理论值1.0909v）

adc_esp32_volts:0.95092
adc_esp32_volts:0.95333
adc_esp32_volts:0.95011
adc_esp32_volts:0.95092
adc_esp32_volts:0.95414
adc_esp32_volts:0.95333
adc_esp32_volts:0.95172
adc_esp32_volts:0.95253
adc_esp32_volts:0.95253
adc_esp32_volts:0.95333
adc_esp32_volts:0.95011
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95253
adc_esp32_volts:0.95333
adc_esp32_volts:0.95172
adc_esp32_volts:0.95092
adc_esp32_volts:0.95253
adc_esp32_volts:0.95253
adc_esp32_volts:0.95172
adc_esp32_volts:0.95011
adc_esp32_volts:0.95333
adc_esp32_volts:0.95172
adc_esp32_volts:0.95333
adc_esp32_volts:0.95172
adc_esp32_volts:0.95253
adc_esp32_volts:0.95253
adc_esp32_volts:0.95172
adc_esp32_volts:0.95011
adc_esp32_volts:0.95011
adc_esp32_volts:0.95172
adc_esp32_volts:0.95333
adc_esp32_volts:0.95011
adc_esp32_volts:0.95253
adc_esp32_volts:0.95333
adc_esp32_volts:0.95172
adc_esp32_volts:0.96703
adc_esp32_volts:0.95172
adc_esp32_volts:0.95495
adc_esp32_volts:0.95092
adc_esp32_volts:0.95253
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95011
adc_esp32_volts:0.95172
adc_esp32_volts:0.95253
adc_esp32_volts:0.95253
adc_esp32_volts:0.95333
adc_esp32_volts:0.95172
adc_esp32_volts:0.95978
adc_esp32_volts:0.95333
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95011
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95253
adc_esp32_volts:0.95092
adc_esp32_volts:0.95495
adc_esp32_volts:0.95817
adc_esp32_volts:0.95253
adc_esp32_volts:0.95253
adc_esp32_volts:0.95333
adc_esp32_volts:0.95092
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95253
adc_esp32_volts:0.95253
adc_esp32_volts:0.95011
adc_esp32_volts:0.95333
adc_esp32_volts:0.95333
adc_esp32_volts:0.95011
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95333
adc_esp32_volts:0.95172
adc_esp32_volts:0.94930
adc_esp32_volts:0.95172
adc_esp32_volts:0.94930
adc_esp32_volts:0.95011
adc_esp32_volts:0.95253
adc_esp32_volts:0.95333
adc_esp32_volts:0.95172
adc_esp32_volts:0.95253
adc_esp32_volts:0.95011
adc_esp32_volts:0.95253
adc_esp32_volts:0.95172
adc_esp32_volts:0.95253
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.94930
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95333
adc_esp32_volts:0.95333
adc_esp32_volts:0.95172
adc_esp32_volts:0.94689
adc_esp32_volts:0.95011
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95253
adc_esp32_volts:0.95011
adc_esp32_volts:0.95011
adc_esp32_volts:0.95253
adc_esp32_volts:0.95172
adc_esp32_volts:0.95092
adc_esp32_volts:0.95172
adc_esp32_volts:0.95414
adc_esp32_volts:0.95253
adc_esp32_volts:0.95253
adc_esp32_volts:0.95253
adc_esp32_volts:0.95253
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95253
adc_esp32_volts:0.95253
adc_esp32_volts:0.95172
adc_esp32_volts:0.95172
adc_esp32_volts:0.95253

 

 

stm32f103c8t6（12bit）实测数据：（校准后）

（fluke电压表实测1.644V）最大误差5mV

ADC1 Reading : 2039 
PA0 True Voltage value : 1.6427 
ADC1 Reading : 2038 
PA0 True Voltage value : 1.6419 
ADC1 Reading : 2039 
PA0 True Voltage value : 1.6427 
ADC1 Reading : 2040 
PA0 True Voltage value : 1.6436 
ADC1 Reading : 2039 
PA0 True Voltage value : 1.6427 
ADC1 Reading : 2041 
PA0 True Voltage value : 1.6444 
ADC1 Reading : 2039 
PA0 True Voltage value : 1.6427 
ADC1 Reading : 2039 
PA0 True Voltage value : 1.6427 
ADC1 Reading : 2039 
PA0 True Voltage value : 1.6427 
ADC1 Reading : 2034 
PA0 True Voltage value : 1.6387 
ADC1 Reading : 2040 
PA0 True Voltage value : 1.6436 
ADC1 Reading : 2040 
PA0 True Voltage value : 1.6436 
ADC1 Reading : 2039 
PA0 True Voltage value : 1.6427 
ADC1 Reading : 2040 
PA0 True Voltage value : 1.6436 
ADC1 Reading : 2038 
PA0 True Voltage value : 1.6419 
ADC1 Reading : 2040 
PA0 True Voltage value : 1.6436 
ADC1 Reading : 2039 
PA0 True Voltage value : 1.6427 
ADC1 Reading : 2040 
PA0 True Voltage value : 1.6436 
ADC1 Reading : 2037 
PA0 True Voltage value : 1.6411 
ADC1 Reading : 2039 
PA0 True Voltage value : 1.6427 
ADC1 Reading : 2038 
PA0 True Voltage value : 1.6419 
ADC1 Reading : 2038 
PA0 True Voltage value : 1.6419 
ADC1 Reading : 2040 
PA0 True Voltage value : 1.6436 
ADC1 Reading : 2039 
PA0 True Voltage value : 1.6427 
ADC1 Reading : 2037 
PA0 True Voltage value : 1.6411 
ADC1 Reading : 2038 
PA0 True Voltage value : 1.6419 
ADC1 Reading : 2037 
PA0 True Voltage value : 1.6411 
ADC1 Reading : 2041 
PA0 True Voltage value : 1.6444 
ADC1 Reading : 2041 
PA0 True Voltage value : 1.6444 
ADC1 Reading : 2039 
PA0 True Voltage value : 1.6427 
ADC1 Reading : 2040 
PA0 True Voltage value : 1.6436 
ADC1 Reading : 2040 
PA0 True Voltage value : 1.6436 
ADC1 Reading : 2040 
PA0 True Voltage value : 1.6436 
ADC1 Reading : 2038 
PA0 True Voltage value : 1.6419 
ADC1 Reading : 2040 
PA0 True Voltage value : 1.6436 
ADC1 Reading : 2038 
PA0 True Voltage value : 1.6419 
ADC1 Reading : 2034 
PA0 True Voltage value : 1.6387

 

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