ST7735 262K Color 160x128 LCD driver #27
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doc/DS18S20.md
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| Dallas Semiconductors DS18S20 temperature sensor | |||
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temperature sensor, what?
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I just copied the docs from the st7735fb repo ... I created a breadboard with this LCD, some switches and a temperature sensor on it. Will tidy it all up when I write up the docs
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| class pcd8544(object): | |||
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| DISPLAYOFF = 0x08 | |||
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| class st7735(object): | |||
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maybe we can start using since [version nr here] from now on. I can't find the sphinx link for the directive now but im sure its there. So we can identify when a new class was introduced.
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Not sure whether this const's idea is such a good idea, as there are ssd1306 specifics in core. Am in the process of detangling it, so this class is likely to be deleted at some point
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ok cool, it's more that I meant to say we could use this directive for any new classes or methods:
.. versionadded:: 3.5
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| def contrast(self, level): | ||
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| NOT SUPPORTED |
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if its not supported it should be safe to pass/ignore/remove this method?
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Need to override the default implementation with a pass so it doesn't do anything. The only way to set the contrast for these LCDs is to PWM the backlight... something that the backlight class doesn't do just yet.
doc/DS18S20.md
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| Dallas Semiconductors DS18S20 temperature sensor | ||
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| Load the one-wire drivers: |
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what's a one-wire driver?
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It's another protocol that just requires a single signal wire that does all the read/write/clocking on a single wire (+ ground). It's supported in the Linux kernel through /sys/bus and there's a good write up on https://en.m.wikipedia.org/wiki/1-Wire
Cant get it working on latest kernel on RPi zero though. Definitely have had it working though...
Driver complete, but needs tests adding & documentation updating
Makes use of the recent 'diff-to-previous' framebuffer so delta's are quite efficient, but full-frame refreshes aren't quick (at least not on a RPi Zero) -- 160x128 RGB pixels is probably getting near to the limit of what python can be made to do.