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：
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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
ads1115（16bit）实测数据：
（理论值1.0909v）
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
adc_ads1115 volts:1.09200
adc_ads1115 volts:1.09219
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