Support for more ADCs

[ankitaggarwal011]

Currently, only ADS1015 analog to digital converter is supported by this project. It would be beneficial to add support for more ADCs, for example MCP3008.

The interface protocol could be either of the supported protocols by Raspberry Pi, for example, I2C, SPI, etc. While the library is implemented in Python, it is possible to use interfaces implemented in C using CPython for better performance.

Any suggestions are welcome. Thanks!

[KVK012]

I tried your software and working as displayed.

Let us say I want to display three ADC data simultaneously in same graph. just like three phase voltage, how can I do?

Please guide.

[ankitaggarwal011]

@KVK012, if you want to display three data ADC streams, you will need either multiple ADCs or an ADC with at least 3 channels. Once you have the required hardware, the code can be changed to accommodate new data streams. I hope that helps.

[KVK012]

Thanks Ankit,

Raspberry pi is communicating with other device through SPI. Everything is working fine for single channel.
Now I have three different channel (array) like Buffer0, Buffer1 and Buffer2 which contains ADC data that I want to display simultaneously.

At this moment I am copying data using self.values.append(Buffer0[i]) and it is working fine.

But how to display Buffer1 and Buffer2 data on Graph? Individually working great but want simultaneously.

Thanks again.

[ankitaggarwal011]

@KVK012, currently the library doesn't support plotting multiple signals at the same time. In order to include this feature, you can simply add more plotting lines. I'll write down the changes you'll need to make for plotting three simultaneous data stream, you can extend it for as many as you want.

• Add another plotting line after https://github.com/ankitaggarwal011/PiScope/blob/master/PiScope.py#L67.

self.line2 = self.ax.plot(xAchse, yAchse, '-')
self.line3 = self.ax.plot(xAchse, yAchse, '-')

• Declare new arrays after https://github.com/ankitaggarwal011/PiScope/blob/master/PiScope.py#L97.

self.values1 = []
self.values2 = []

• Add the data to the required arrays after https://github.com/ankitaggarwal011/PiScope/blob/master/PiScope.py#L115.

self.values1.append(Buffer1)
self.values2.append(Buffer2)

• Plot this new line after https://github.com/ankitaggarwal011/PiScope/blob/master/PiScope.py#L128.

self.line2[0].set_data(CurrentXAxis, pylab.array(self.values1[-NumberSamples:]))
self.line3[0].set_data(CurrentXAxis, pylab.array(self.values2[-NumberSamples:]))

Let me know if that works and please consider contributing this feature to the library (#10). Also, I would appreciate if you add the support of your ADC in the library. Thanks.

[ankitaggarwal011]

@KVK012, I would appreciate if you can update with your findings. Thanks.

[KVK012]

First of all, Thanks Much for your help.

Yes it is working as expected, I will post code for sure, but will take some time. It is very simple as explained by you.

Thanks again.

[KVK012]

unclean version are attached here, please rename with .py.

In that there are two boards connected through SPI, one is RPI (Master) and second is STM32 board(Slave). Sensors are connected to STM32 boards and sending data to the RPI using SPI. You can send ADC data as well on same channel.

I have also modified several thing in GUI, you can compare my code with Ankit`s code.

PiScope.txt
Compute.txt

[ankitaggarwal011]

@KVK012, I'm glad that it worked. Thank you for sharing your code. In future, whenever you've some spare time, please consider contributing the same to this library. All the best!

[KVK012]

Hello Ankit,

Just resumed work on this!!
can you please guide how to add radio button to enable or disable the channel.
let say I have three radio button for three different channel and if I tick only one then graph for that channel will be displayed on the screen, and if I tick all three then all channel will be displayed on the graph or screen.

Any suggestion?

Thanks,

[ankitaggarwal011]

Hi @KVK012, what you're asking shouldn't be too difficult, you can create a button in a manner similar to https://github.com/ankitaggarwal011/PiScope/blob/master/PiScope.py#L86 and attach it with a method to show (self.line1[0].set_visible(True)) or hide (self.line1[0].set_visible(False)) a particular channel. I hope this helps.