Vent Display

Yonder Phy

We have an RJ45 port, pinouts are

Seems like this should be straightforward - datasheet notes that data is uni-directional, my guess is that it just spews data out of the port, wouldn't that be nice.

First move is to get it venting. Setup Guide

OK, have woken it up with a glove, can confirm it has an RS232 out that just spews data - that's great. I do need an RS232 interface though, which swings -10 to +10v here.

RPI

pi
vent

• do rpi basic setup:
  • use mouse, keyboard, hdmi...
  • connect to internet, do updates
• install node.js
  • $ curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -
  • $ sudo apt install -y nodejs
• install raspi-serial
  • have to do some serialport config stuff
  • might be some trix in here: the bluetooth module uses the serialport, so we have to wrestle for control
• get vscode ?

I think we want RPI4 for this, they have decent UART support now.

• https://learn.pi-supply.com/make/raspberry-pi-4-pinout/
• https://datasheets.raspberrypi.org/bcm2711/bcm2711-peripherals.pdf

Log

2020 11 05

OK, turned the vent on today, and got characters from the RS232 port. Have an RPI setup and ready to test with some code tomorrow morning, and a temporary RS232-TTL adapter to splice in between. Some concern about the RPI's serial port being 'in use' when bluetooth module is being used, etc. RPI 4 has mucho ++ serial ports, will try to use one of those in the end run.

So, first move tomorrow is getting the serial port hooked up & seeing if I can pull anything into JS, then is a little software architecting.

2020 11 06

Serial on the RPI3 is a pain, have to disable a bunch of things:

https://openenergymonitor.org/forum-archive/node/12311.html

OK, so I: - used node serialport (not the particular raspi-serial library) - set it up for /dev/ttyAMA0, the default port - baudrate to 60096 - use a bytelength parser - disable the uart terminal / enable the uart hardware in sudo raspi-config - put dtoverlay=pi3-disable-bt in /boot/config.txt - did sudo systemctl disable hciuart - rebooted - now I am recieving bytes

So I should decode some packets.

Packets: decoded. Now I want the 'other end' of it, my bootstrap code / server / client.

Cool, have a bootstrap up, just need to plug it into the ltv, get three plots up and one state-swapping thing, then it should be ahn MVP, next step would be a circuit / display.

OK, I have the client / server architecture setup now... so just one more day at that and I should have an MVP, good enough to proceed with a circuit etc.