Jan 22: Working on Pico off-shoots, like the Core module.
Dedicated thread for the minicore:
https://www.reef2reef.com/threads/reefvolt-minicore-ph-1-wire-sensor-module-for-reef-pi.891002/
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Original Old Content from 2018
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I'm working on a functional base-board to be used by the Reef-Pi project and software as an open hardware design. I worked with Ranib initially to come up with some concepts of I/O and other capabilities he would like to see in such a module, and prototyped an initial concept that was named the "Pico". Unfortunately I had to take many months off due to family and personal reasons, but now would like to kick this project back into action.
The overall and original goal was to provide the basic building blocks and hardware I/O:
- Host to a Raspberry Pi Zero W board
- Onboard 5V power supply for the RPi
- Buffered or high current digital I/O blocks at 5V (brought out over an HDMI and pluggable terminable block)
- Direct 1 wire interface
- 2x 0-10V analog output using the onboard PWM
- Hardware RTC with battery backup for the Raspberry Pi
- Optional isolated pH circuit
- Optional interface to aquarium CAN bus
The board was designed to fit in an off the shelf plastic box, namely the Polycase LP-55F
https://www.polycase.com/lp-55f
After the initial design, several changes were proposed:
- Swapping the digital I/O to use a DB9 with current sinks for the American DJ relay power strips.
- Cleanups and misc other connector re-arrangements.
The first version of the board looks like this:
The schematics for it are below:
https://theatr.us/images/blueacro/reefpi/reefpi_pico_v1.pdf
The updated revision is not yet ready, as I'm busy validating this design end to end.
Dedicated thread for the minicore:
https://www.reef2reef.com/threads/reefvolt-minicore-ph-1-wire-sensor-module-for-reef-pi.891002/
--------------------------------------------------------------------
Original Old Content from 2018
-------------------------------------------------------------------
I'm working on a functional base-board to be used by the Reef-Pi project and software as an open hardware design. I worked with Ranib initially to come up with some concepts of I/O and other capabilities he would like to see in such a module, and prototyped an initial concept that was named the "Pico". Unfortunately I had to take many months off due to family and personal reasons, but now would like to kick this project back into action.
The overall and original goal was to provide the basic building blocks and hardware I/O:
- Host to a Raspberry Pi Zero W board
- Onboard 5V power supply for the RPi
- Buffered or high current digital I/O blocks at 5V (brought out over an HDMI and pluggable terminable block)
- Direct 1 wire interface
- 2x 0-10V analog output using the onboard PWM
- Hardware RTC with battery backup for the Raspberry Pi
- Optional isolated pH circuit
- Optional interface to aquarium CAN bus
The board was designed to fit in an off the shelf plastic box, namely the Polycase LP-55F
https://www.polycase.com/lp-55f
After the initial design, several changes were proposed:
- Swapping the digital I/O to use a DB9 with current sinks for the American DJ relay power strips.
- Cleanups and misc other connector re-arrangements.
The first version of the board looks like this:
The schematics for it are below:
https://theatr.us/images/blueacro/reefpi/reefpi_pico_v1.pdf
The updated revision is not yet ready, as I'm busy validating this design end to end.
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