What is it? It is equivalent to six Sparkfun FemtoBuck LED drivers connected to an Arduino Pro 328. I also added hardware to monitor input current and control power from an alternate power input an...Read More…
It is equivalent to six Sparkfun FemtoBuck LED drivers connected to an Arduino Pro 328. I also added hardware to monitor input current and control power from an alternate power input and to the shield VIN pin. The ATmega328p based board has headers for an RPUpi or RPUadpt mezzanine shield. ADC channels are connected to a high side current sense (ZXCT1087) on channel six, and to a voltage divider on channel seven. Each of the AL8805 based constant current sources provide 330mA for LED strings. The current controllers are connected to PWM pins (OC0A, OC0B, OC1A, OC1B, OC2A, OC2B).
See the RPUlux on Github for more information.
I was looking at Sparkfun's FemtoBuck but I want everything on one board with a way to measure input power and disconnect the power on the VIN pin for my RPUpi shield.
I plan to use this in my workshop and outside in the garden with solar power.
It uses simple hardware and works with an open source toolchain that I can install on Operating Systems I use including the Raspberry Pi Zero plugged into my RPUpi shield.
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United States Postal Service: Priority Mail
Priority Mail Small Flat Rate Box will hold two RPUno, or two shields (RPUftdi or RPUadpt) and an RPUno.
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I am working on what may be thought of as a SCADA system for the garden and workshop. I prefer WiFi to be on the SBC (Pi Zero) or host computer that I can then connect to a multi-drop serial for interfacing the somewhat industrialized microcontrollers. To bootload, I have set up the multi-drop serial so it has a full duplex connection between the host and microcontroller and a half-duplex connection that can manage what is (or is not) connected to the full-duplex bus. This is done with a specific favor (Intersil) of RS-485 transceivers.