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关于ADS1115采集数据不连续的问题

Other Parts Discussed in Thread: ADS1115

我使用STM32读取ADS1115,读取间隔大概是300MS一次 串口读出来的数据是下面这个样子的,也就是在短时间内变化在大概0.03V的范围内 它是不变化话,实际我用电压表测是一个连续下降的值(至少单位时间内电压的变化下降比串口读出来的要多),而我使用ADS1115测电压源的时候,手动调节电压变化(让它变化幅度比较大),如果变化大的话 ADS1115是可以读出来的。我需要用采样精准点,连续变化的值,应该怎么办啊,是程序问题吗?

1.5999 TIME: 06.681 
1.5999 TIME: 07.123 
1.5999 TIME: 07.565 
1.5679 TIME: 08.007 
1.5679 TIME: 08.449 
1.5679 TIME: 08.893 
1.5679 TIME: 09.336 
1.5359 TIME: 09.777 
1.5359 TIME: 10.219 
1.5359 TIME: 10.661 
1.5359 TIME: 11.103 
1.5039 TIME: 11.545 
1.5039 TIME: 11.987 
1.5039 TIME: 12.429 
1.5039 TIME: 12.871

电压源读取间隔大概为200MS

1.824 TIME:44.954]
1.920 TIME:45.089]
1.824 TIME:45.223]
1.824 TIME:45.357]
1.824 TIME:45.490]
1.776 TIME:45.624]
1.920 TIME:45.759]
1.824 TIME:45.893]

10.8更新:我又用单片机自带的ADC采集了下数据,采集出来的数据是实时变化,没有任何问题的