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Gravimetric

for calibration of flow measurement

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An ATmega324pb is for applications and provides ICP1 (flow pulse), ICP3 (start), ICP4 (stop) to calibrate pulse output flow meters with crystal timing precision. The board has pads for a 40 pin header that a Raspberry Pi Zero can plugin and interface to serial and SPI. The interfaces use IOFF buffers as needed so the R-Pi can power down (or not be present) without disrupting application functions. An ATmega328pb is used to manage a multi-drop serial interface (RPUbus) between a local or remote R-Pi and application controller, as well as the onboard power features.

Flow measurement calibration. A paddle wheel in a ditch can measure flow as it rotates and trips a switch, but the volume that passed through and caused the pulse may need to be calibrated, and the m324pb microcontroller on this board is set up to use its input capture hardware to help do that.

I have some experience in this area, but it is incomplete; my goal is to improve and make something that could be useful for others.

  • ^1 fix hardware issues and some signal remapping

    ronald.sutherland5 days ago 0 comments

    After hacking a ^0 to try out an idea for the alternate power input and some hacks to fix other bugs, I did a re-spin of the board. The new revision would also make the manager responsible for enable/disable of power to the SBC, and alternat power. The analog measurements of both alternat and primary power voltage and current are also now in the manager's domain. With luck, the application will not need to concern itself with things like battery charging. The SelfTest got a few changes, but not much, unfortunately, I found another hardware bug that I thought was software, so another spin ^2 is needed.

    I will likely hold off on ^2 for some time while I sort out the manager firmware and then spin some other boards (RPUlux, Irrigate7, RPUno) based on this new design.

  • ^0 init

    ronald.sutherland5 days ago 0 comments

    I was trying to get an outfit I know interested in this board, but that did not happen. I combined my RPUpi shield and an ATmega324pb for the application program. The combination worked, but I had a few hardware bugs to sort out, so another revision was needed. For this board, I started software development with the SelfTest first to help find the problems. I suspect it speeds up hardware development. I only worked on the library (core) parts that were part of testing.

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