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README
Apache-2.0

MiniDSO-Pro

介绍

B站老刘示波器Pro版本,在原版的基础上,扩展了测量负电压的功能,更新了UI设计,屏幕升级为1.3寸OLED屏。你可以在doc文件夹,获取设计报告和相关的芯片数据手册。

请大家务必给我个Star!!!这真的很重要!

B站视频演示:点击我观看

3D仿真效果图:

2D仿真效果图:

实物效果图:

系统架构

Mini示波器采用了一套成本低廉但高效的硬件,配合层次化的软件框架,实现对常规低频信号波形的采集、分析、显示。

硬件部分的主要工作有:电源管理(5V、2.5V、-5V);对信号的衰减、限幅、偏置。最后将处理好的电压信号送入MCU的ADC外设,进行数据采集。由于ADC外设只能采集正电压,因此我们通过增加偏置电压的方式,将负电压抬高来采集。

软件部分的主要工作有:底层驱动SDK框架、ADC滤波算法、波形数据处理、人机交互界面。SDK提供基本的模块和外设驱动支持,滤波算法去除噪声和毛刺,波形处理计算电压值和频率,并为波形显示做准备;人机交互界面提供屏幕显示(OLED屏)和操作方式(旋钮和按键)。

与原版对比

这一版本的Mini示波器-Pro,相比于原版对硬件部分做了很大扩展,使其可以测到负电压。软件部分修改了有30%,主要是在数据处理和UI显示部分。

调参教程

示波器采样的原理与原版一致,但是由于硬件上加了许多电路,导致信号呈非线性变化,因此需要对系统计算的结果进行处理。

这里提供两种办法:

1. 对原采样方法进行改进

原版的采样模式,是利用了芯片自带的12位ADC进行采样,所以可以对ADC的采样函数进行优化。原版使用了查询法,通过循环等待采样完成标志位,获取采样结果。

频率的计算,是根据不同的采样时间(delay延时等待法),来分段计算频率值。这里可以通过定时器来控制采样时间,提高精确度。

2. 对原采样结果上进行拟合

直接在原版的采样结果上进行数据拟合,这样做比较快捷,也是我用的方法(主要是赶时间)。但是误差较大,且需要测算的数据量有一点多。

具体的方法是,首先记录原采样的结果,电压幅度的刻度为0.5V,范围是从0V到20V。 频率的刻度为1KHz,范围是从0KHZ到20KHz。将测算的结果与输入的信号,一一对应拟合出计算公式,我采用的Excel来操作,选择的是对数函数来拟合,数据有误差。

具体需要拟合的函数在chart.c文件中,函数名称如下:

/* 需要拟合数据的函数如下:*/
void getWaveFreq(void);
void AnalyseData(void);

/* 拟合数据的结果存放在如下变量:*/
VMax_m  /* 存放电压最大值 */
VMin_m  /* 存放电压最小值 */
Mvoltage  /* 存放电压平均值 */

WaveFreq   /* 存放频率值 */

开发者在调参的时候,可以屏蔽我的拟合代码,进行原方法采样结果的记录,然后进行数据拟合。我会在代码中进行标注,方便开发者查找和修改。

需要改进的地方

1.硬件的性能还没有全部发挥出来,测量幅度还可以更高。 2.MCU的性能还没有榨干,比如没有用上硬件SPI,提高屏幕刷新率。

开发后记

1.最一开始设想的方案,我是想用上我写的AntOS操作系统的,但是初版操作系统,为合作式调度,实际使用的过程中,并没有达到我的预期效果,所以选择在老刘示波器的基础工程上修改和优化。

2.硬件设计主要参考了B站唐老师讲电赛大佬提供的方案,实际使用的过程中,我又微调了一部分,建议大家可以去阅读一下硬件电路中使用的几种芯片数据手册,这样心里更有底,不然遇到问题不好排查。

3.大多数元器件,我用的都是0603的封装,这样可以让PCB板设计的更小巧更紧凑,但是不好焊接。

4.下一版本,我将使用STC8AxD4作为主控(因为有DMA),软件上使用我现在编写AntOS(已支持抢占式调度),进一步提高示波器的性能。

####原版示波器Github仓库连接

点击我跳转

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简介

B站老刘示波器Pro版本,在原版的基础上,扩展了测量负电压的功能,更新了UI设计,屏幕升级为1.3寸OLED屏。 展开 收起
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