[Sugar-devel] Measure Activity

[James Cameron]

Voltage and resistance sense features of Measure activity main branch
head can only be tested with hardware that supports a DC mode on the
audio input jack, and consequently ASLA.

Raspberry Pi 4 does not have an audio input jack; you can see from the
schematics that the A/V JACK has the input pin 2 grounded, and only
the output pins available, and they are buffered as outputs by U5.

https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_SCH_4b_4p0_reduced.pdf

So you can't test all existing features using a Raspberry Pi 4.

Raspbian has many low-speed inputs that could be used to implement a
new feature similar to the existing features, but the underlying API
would likely be different.  Someone looking to implement those will
need to familiarise with relevant kernel modules and user-space data
acquisition modules.

For implementing in Javascript, you'll need to find how to write
against an API for low-level hardware access.  I don't know of one.  I
doubt it will be possible without making the resulting program
specific to a particular model of computer, and that is unlikely to be
interesting to Sugarizer project.

On Mon, Apr 05, 2021 at 10:45:27PM +0530, Aditya sinha wrote:
> Hi everyone. I hope you are doing good. I went through the Sugar Measure
> Activity. I found the voltage and resistance sense features. I am currently
> using Sugar on Raspberry Pi 4. I want to know how should I test this features
> and any suggestions on how to implement them in Javascript. I did not find any
> information regarding these features on GSOC Ideas page.
> 
> Regards
> Aditya Sinha

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-- 
James Cameron
https://quozl.linux.org.au/