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Notes

To validate:

  • [OK] TUSB2046 USB hub
  • [OK] DUT power control: VIN, 5V, 3V3
  • [OK] INA260 current sensors (Using library)
  • [OK] Piezo beeper
  • [OK] TCA9548 I2C multiplexer
  • [OK] AD5593R I/O expander
  • CAT24C32 EEPROM (Test Module, on I2C bus 1)
  • CAT24C32 EEPROM (HAT, on I2C bus 0)

Light Box

Logitech Brio MX 4K webcam

sudo apt install fswebcam

To check available resolutions:

v4l2-ctl --list-formats-ext

Must be plugged into USB3 port and detected as a USB3 device to provide 4K res.

fswebcam -r 3840x2160 -p MJPEG --skip 10 test9.jpg

It's only being detected as USB2.0:

lsusb -t

shows 480M (USB2.0) instead of 5000M (USB3.0) even plugged in directly.

According to Gemini, Pi 3B+ only has a shared internal USB2.0 bus, even though it exposes USB3 ports externally! This sucks

Got it working an a Pi 5B with a Comsol USB-A to C cable CMAM12BK

Options like this work, although gain doesn't seem to do anything:

fswebcam -r 3840x2160 -p MJPEG --set brightness=100% --set contrast=60% --set sharpness=80% --set gain=255 --skip 20 test17.jpg

Stacking images

Script to take a series of pics:

#!/bin/bash

Create a directory for the images if it doesn't exist

mkdir -p webcam_images cd webcam_images

Capture 10 images with a 1-second delay between captures

for i in {1..5}; do echo "Capturing image $i..." # -r specifies resolution, --no-banner removes the timestamp # -S 10 skips the first 10 frames to allow calibration fswebcam -r 3840x2160 -p MJPEG --no-banner --set brightness=80% --set contrast=60% --set sharpness=60% --skip 20 image_$i.jpeg sleep 1 done

echo "Capture complete."

Install ImageMagick:

sudo apt install imagemagick

Process pics:

magick convert *.jpeg -evaluate-sequence median stacked_image.jpeg

Printer control

Alternative to using external process and passing it a text file:

https://github.com/python-escpos/python-escpos

Colour sensing

https://github.com/DevelopiumTech/VEML3328

https://www.digikey.com.au/en/products/detail/vishay-semiconductor-opto-division/VEML3328SL/10673128

https://www.finntestelectronics.com/product/mega-module/

Writing tests

Use Given - When - Then format? Or AAA?

Use raw Python, or some kind of config? Config is hard! For eg:

How to format error message with results?

Simple string, then output of all "then" lines?

object: title: 5V power rail abort_on_fail: true fail_message: 5V power rail out of spec given: - 5v: true - boolean: true when: - 5v: true - delay: 100ms then: - analogread a5: 4.7 - 5.1

object: title: 3V3 power rail abort_on_fail: true fail_message: 3V3 power rail out of spec given: - 5v: true - boolean: true when: - 5v: true - delay: 100ms then: - analogread a6: 2.9 - 3.4

TCA9548 I2C multiplexer

Needs Blinka installed:

https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi

sudo apt-get update
sudo apt-get -y upgrade
sudo apt-get install -y python3-pip

pip install rpi-lgpio

https://learn.adafruit.com/adafruit-tca9548a-1-to-8-i2c-multiplexer-breakout/circuitpython-python

sudo pip3 install adafruit-circuitpython-tca9548a

AD5593R I/O expander

https://github.com/101Robotics/AD5593-MicroPython

https://learn.adafruit.com/adafruit-ad5693r-16-bit-dac-breakout-board/circuitpython-and-python

python -m venv venv
source venv/bin/activate
pip install adafruit-circuitpython-ad569x
pip install lgpio

Pi power control

To allow Node-RED to shut down the Pi:

https://flows.nodered.org/node/node-red-contrib-rpi-shutdown

INA260 current sensors

https://pypi.org/project/ina260/

pip install ina260

from ina260.controller import Controller
c = Controller(address=0x40)
print(c.voltage())
print(c.current())
print(c.power()))

MCP23017 I/O expanders

Use Adafruit Blinka for CP style access to MCP23017 from within Python:

https://learn.adafruit.com/using-mcp23008-mcp23017-with-circuitpython/python-circuitpython#python-installation-of-mcp230xx-library-3005480

Created a test script called mcp-test.py

Pullup example:

pin1.direction = digitalio.Direction.INPUT
pin1.pull = digitalio.Pull.UP

DUT Power Control

pinctrl 17 op dh   // Turn on VIN
pinctrl 27 op dh   // Turn on 5V
pinctrl 22 op dh   // Turn on 3.3V

Piezo control

pinctrl 23 op dh   // Turn on piezo
pinctrl 23 op dl   // Turn off piezo

Data import

Export spreadsheet from gdocs as XLSX, and scp it to the portal VM.

cd /var/www/register-test/pyproj
. env/bin/activate
./manage.py import-xlsx ~/Device-Serial-Numbers-.xlsx

Label printer

Brother label printer on Linux: https://github.com/HenrikBengtsson/brother-ptouch-label-printer-on-linux

For CAN: MCP251863 controller/ transceiver (See CANPico board)

https://github.com/kentindell/canhack/tree/master/CANPico

https://core-electronics.com.au/adafruit-picowbell-can-bus-for-pico-mcp2515-can-controller.html

https://github.com/LukePrior/Raspberry-Pi-Thermal-Printer

Firmata for Raspberry Pi Pico:

  • Use ConfigurableFirmata with zero changes
  • Board profile is "Arduino Mbed OS RP2040 Boards" -> "Raspberry Pi Pico"
  • Upload methd: UF2

Impressive 3D printed test jig run by a Raspberry Pi:

https://www.youtube.com/watch?v=iTLnJ0uIZIg

Firmata equivalent for RPi Pic:

https://github.com/MrYsLab/telemetrix-rpi-pico

Equivalent to Firmata:

https://abyz.me.uk/picod/py_picod.html

Config files using configparser:

https://stackoverflow.com/questions/19078170/python-how-would-you-save-a-simple-settings-config-file

https://www.geeksforgeeks.org/how-to-create-gui-applications-under-linux-desktop-using-pygobject/

Thermal camera for Raspberry Pi:

https://www.flir.com.au/developer/lepton-integration/lepton-integration-raspberry-pi/

Thea's tester:

https://twitter.com/theavalkyrie/status/1552714810038657025

https://github.com/wntrblm/Hubble

Capturing from Raspberry Pi cam:

raspistill -st -t 200 -o image.jpg

Process

Install Raspberry Pi OS 64-bit. Edit the settings:

  • Set hostname to tester(x).local
  • Set username to testomatic
  • Set password to something secret
  • Set WiFi credentials
  • Set WiFi country
  • Set locale
  • Enable SSH

Put SD card in Pi and boot it.

SSH to the pi:

ssh testomatic@tester.local

Update system and install Vim:

sudo apt update
sudo apt dist-upgrade
sudo apt install vim

Install node-red

Go to http://tester3.local:1880/

Install the palette item "node-red-contrib-ip" Install the palette item "@flowfuse/node-red-dashboard"

sudo apt install pipx
pipx install esptool

Kiosk tutorial: https://www.raspberrypi.com/tutorials/how-to-use-a-raspberry-pi-in-kiosk-mode/

sudo apt install wtype
sudo apt install chromium-browser

sudo vim .config/wayfire.ini

Add this new section:

[autostart] chromium = chromium-browser http://localhost:1880/dashboard/page1 --kiosk --noerrdialogs --disable-infobars --no-first-run --ozone-platform=wayland --enable-features=OverlayScrollbar --start-maximized

sudo apt install chromium-browser

Add to /etc/xdg/lxsession/LXDE-pi/autostart:

@xset s off @xset -dpms @xset s noblank @chromium-browser --noerrdialogs --disable-infobars --kiosk https://localhost:1880/dashboard/page1

Enable Screen

edit /boot/firmware/config.txt and find this line:

dtoverlay = vc4-kms-v3d

Replace it with:

dtoverlay = vc4-fkms-v3d

sudo vim /boot/firmware/config.txt

Add these lines to the end:

hdmi_force_hotplug=1
max_usb_current=1
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt 1024 600 60 6 0 0 0
hdmi_drive=1

Elecrow 7" touchscreen setup: https://www.elecrow.com/rc070p-7-inch-1024x600-raspberry-pi-monitor-touchscreen-capacitive-ips-display-with-built-in-speaker-stand.html

Receipt Printer Driver

copy printer-driver-pos_3.13.11_all.deb to machine

sudo dpkg -i printer-driver-pos_3.13.11_all.deb

Open printer preferences and enable network administration.

Use a browser to connect to https://tester.local:631

Add local printer.

Select the POS-80.

On the printer type page, select Make -> POS Select Model -> POS-80 (en)

Install Software

Copy over test software directory.

pip3 install pytz
pip3 install esptool