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PCB redesign - rev2
07/16/2018 at 12:51 • 0 commentsThe PCB has been redesigned - we've decided to use SMD parts which can be placed using a pick-and-place machine and left the LEDs to be assembled by hand. This makes it easy to turn it into a DIY kit which doesn't require a huge amount of soldering - just the LEDs. With this redesign, we've addressed the PWM issue - we can now display the whole color spectrum using generic RGB LEDs.
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Si7021 now supported as an environmental sensor
05/07/2018 at 20:40 • 0 commentsI've added support for another inexpensive environmental sensor - the Si7021. It is pin-compatible with the HTU21, so you can use both interchangeably. The software will automatically detect and report which sensor is attached upon startup.
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Slight rewiring required to get PWM to work
05/02/2018 at 13:19 • 0 commentsWe've discovered that there's a problem driving our LEDs via PWM - the library we're using doesn't let us use GPIO16 as a PWM pin. We think the best way to solve this would be to rewire the pins around a bit.
INPUT / OUTPUT LABEL OLD GPIO NEW GPIO HTU_SDA GPIO5 GPIO0 LED_B_CTRL GPIO16 GPIO5 HTU_SCL GPIO4 GPIO2