Wednesday, June 17, 2020

RC Groups - View Single Post - FRSKY Taranis "How to" Thread


Capturing a double-pull of a momentary switch


Thought I'd share this snippet for capturing a double-pull of a momentary switch. Applications include anywhere a 'safe' switch is required, for example for arming a motor or u/c operation.

Operation:

Pull SH twice within a 1.5 second window. The second pull is captured as an edge in L3.

Code

L1 Edge(L02, [0:instant]) Duration(1.5s)
L2 ( Edge(SH-down, [0:instant]) )
L3 L01 AND L02

How it works
  • Pulling SH generates an edge in L2, which cascades to L1 a clock tick later.
  • Because an edge is true for just a single clock tick, L3 is true only from the second pull. This must be within the time period set in L1.Duration (1.5 secs).

Simple demo - each double-pull toggles a sticky switch:

L4 Sticky(L03, L03)

Tuesday, June 16, 2020

Sunday, June 14, 2020

FrSky SxR Gains

Mike Blandford confirms:
In auto-level mode, the individual gains set using the script affect the amount of servo movement output to get to level. The channel 9 gain affects the speed of the servo response..

Tuesday, June 9, 2020

Viewing Wyze Cam on Computer

tl;dr: Wyze supports RTSP with a bit of effort.

Directions and download here:
https://support.wyzecam.com/hc/en-us/articles/360026245231-Wyze-Cam-RTSP


  • Download the firmware
  • Boot Cam with firmware on SD card.  It will take 3-4 minutes to install.
  • In your phone app, Settings / Advanced Settings / RTSP
  • Turn on RTSP toggle
  • Set name and password, click Generate URL
  • Watch with VLC

Sunday, June 7, 2020

Reference: Geekcreit® 375pcs 3MM 5MM LED

https://www.banggood.com/Geekcreit-375pcs-3MM-5MM-LED-Light-Emitting-Diode-Beads-Resistance-Lights-Kits-Bulb-Lamp-p-1027601.html

Current : 20mA
Voltage: 3V
Color: RED, BLUE, YELLOW, GREEN, WHITE
Total Quantity: 375pcs
Packed in a box
             375pcs Five Colors 3mm,5mm Round Bright Light LED Assortment Kit
Color
Size
Wavelength
       (nm)
Voltage
    (V)
Current
    (mA)
Intensity
  (mcd)
Lens Color
Quantity
Red
3mm
620-630
1.9-2.1
20
3000-4000
red
50pcs
Red
5mm
620-630
2.8-3.1
20
4000-5000
red
25pcs
Yellow
3mm
580-590
1.9-2.1
20
5000-6000
yellow
50pcs
Yellow
5mm
580-590
2.8-3.1
20
4000-5000
yellow
25pcs
Green
3mm
570-573
3.2-3.4
20
10000-12000
green
50pcs
Green
5mm
570-573
3.0-3.4
20
12000-14000
green
25pcs
White
3mm
610-620
1.8-2.2
20
3000-4000
clear
50pcs
White
5mm
500-620
3.0-3.2
20
12000-14000
clear
25pcs
Blue
3mm
460-470
3.2-3.4
20
3000-4000
blue
50pcs
Blue
5mm
460-470
3.0-3.4
20
5000-6000
blue
25pcs

Reference: TTGO ESP32 1.14 Inch LCD LILYGO

On Banggood.
Demo: https://github.com/Xinyuan-LilyGO/TTGO-T-Display








Random notes for the BG page:

IPS ST7789V 1.14 Inch has 135x240 pixel
Display has 340x240 pixel resolution
LCD resolution 240x135

Driver ST7789 (uncomment #define ST7789_DRIVER in User_Setup.h)
Color order Blue-Green-Red (uncomment #define TFT_RGB_ORDER TFT_BGR in User_Setup.h)
Device TTGO_T_Display (uncomment #include in User_Setup_Select.h)


the display seems to require its own graphic library, on github:
github.com/Xinyuan-LilyGO/TTGO-T-Display
github.com/Bodmer/TFT_eSPI

Q:Is the SPI bus accessible for other sensors (other than the display)?
A :  VSPI default pins are connected to display and are not available on the headers. HSPI by default uses GPIO 12 to 15. Unfortunately GPIO14 (CLK) is apparently also used by the display BL function. So I assume you will need to remap 14 to another pin to get CLK. (I have not tried this).

Seems to be a difference in this regard between version 1.0 and 1.1. The board I received says V1.1 in silkscreen. According to the pin-out for this version on GitHub GPIO4 (not GPIO14 as indicated above) is used for BL.

Battery-Molex-Pico-1_25mm

Use this library for the display: github Bodmer TFT_eSPI
Look on github for Tetris Clock and "TTGO_example", you will find a library and example I wrote for this board. It has an explanation page that shows how the board looks when running it.

What pins provide me with access to the serial port? TX / RX?
A: A "standard" ESP32 has more pins, the default pins are 3 (Rx) and 1 (Tx) for Serial(0), 9 (Rx) and 10 (Tx) for Serial1, and 16 (Rx) and 17 (Tx) for Serial2. As you can see, with the limited number of pins on this TTGO board, none of them are there. But the good news is that the "Serial.begin" function has an option to change the pins! By using "Serial2.begin(9600, SERIAL_8N1, 25, 26);" you have the Serial2 port on pins 25 (Rx) and 26 (Tx). I tested this today, it's working like a charm!. It's NOT working on pins 37 and 38 (and maybe other pins), but it IS working on pins 25, 26, 27 !!!

This board is an 'ESP32 dev board' and it can be used with the arduino IDE but because it isn't an arduino you'll need to configure the IDE with the new board by adding an 'additional board manager url' to arduino preferences.
Some details of how to do this are here:  youtube mBaS3YnqDaU

The board comes loaded with the arduino sketch from here:
Search github Xinyuan-LilyGO TTGO-T-Display

There is a good youtube vid explaining it a little here: youtube qj9dN-Ginxc
The above is a great intro into how to use the 320x240 display and even makes use of the two buttons near the usb port to show voltage and scan for wifi networks.

https ://github.com/Xinyuan-LilyGO/TTGO-T-Display/blob/master/schematic/ESP32-TFT(6-26).pdf

Using the Tiltmeter

Setup
  • Be sure you have run the self-test to set level and stick travel.
  • Depending on servo installation, pitch may be reversed.  That's indicated in parentheses below.
  • Set gain to maximum, it will make for largest pitch variation.


  • Ailerons
  • Moving stick to left is correction for roll right.  Left aileron moves up.
  • Move stick to left.   Note audio-pitch goes up (or down).
  • Hold plane, twitch right wing down. You should hear audio-pitch up (or down).
  • Twitch left wing down.  You should hear audio-pitch down (or up).

  • Rudder
  • Moving stick to left is correction for yaw right.  Rudder moves left.
  • Move stick to left.   Note audio-pitch goes up (or down).
  • Hold plane, twitch noseto right. You should hear audio-pitch up (or down).
  • Twitch nose to left.  You should hear pitch down (or up).

  • Elevator
  • Moving stick back is correction for pitch up.  Elevator moves down.
  • Move stick down.   Note audio-pitch goes up (or down).
  • Hold plane, twitch nose down. You should hear audio-pitch up (or down).
  • Twitch nose up.  You should hear audio-pitch down (or up).
  • (note) I typed the above because my brain gets confused when I tune planes with servos reversed.  Maybe I should add a reversing button to the tiltmeter so that I can match my brain thinking, which is
  • Pitch up = Left aileron up
  • Pitch up = Elevator up
  • Pitch up = Rudder left
  • Friday, June 5, 2020

    OctoPrint: Turning on an LED during printhead heating

    I do this so I can more easily inspect the printhead for ooze, etc.

    Install OctoPrint plugin "GCODE System Commands"

    Configure Plugin

    OCTO 21 /home/pi/scripts/led-on
    OCTO 22 /home/pi/scripts/led-off

    Use This Code


    $ cd /home/pi/scripts
    $ cat led-on.c
    void main()
    {
      system("echo 23 >/sys/class/gpio/export");
      system("echo out >/sys/class/gpio/gpio23/direction");
      system("echo 1 >/sys/class/gpio/gpio23/value");
    }
    $ cat led-off.c
    void main()
    {
      system("echo 0 >/sys/class/gpio/gpio23/value");
      system("echo 23 >/sys/class/gpio/unexport");
    }

    $ make led-on led-off
    (ignore warnings)

    $ sudo chown pi.gpio led-off led-on
    $ls -l led-on led-off
    -rwxr-xr-x 1 pi gpio 7984 Jun  5 20:33 led-off
    -rwxr-xr-x 1 pi gpio 7984 Jun  5 20:33 led-on

    Add OCTO commands to to your slicer gcode template

    (for Prusa-Slicer, in Printer Settings/Custom Gcode/Start GCode).
    Mine looks like this:

    G28 W ; home all without mesh bed level
    OCTO21 ; turn on external light
    G1 Z30 ; raise printhead for visual inspection
    M109 S[first_layer_temperature] ; wait for extruder temp
    M190 S[first_layer_bed_temperature] ; wait for bed temp
    OCTO22 ; turn off external light


    Thursday, June 4, 2020

    Raspberry Pi Blink in shell



    #!/bin/sh

    # release the pin on exit
    trap 'echo 0 >/sys/class/gpio/gpio23/value;echo 23 >/sys/class/gpio/unexport' 0

    echo 23 >/sys/class/gpio/export
    echo out >/sys/class/gpio/gpio23/direction

    while true; do
      echo 1 >/sys/class/gpio/gpio23/value
      sleep 1
      echo 0 >/sys/class/gpio/gpio23/value
      sleep 1
    done


    # for input:
    #  echo 23 >/sys/class/gpio/export
    #  echo in >/sys/class/gpio/gpio23/direction
    # read value:
    #  cat /sys/class/gpio/gpio23/value
    # release a pin
    #  echo 23 >/sys/class/gpio/unexport

    Troubleshooting SiLabs Driver on Mac notes

    tl;dr:

    • 99% chance it's a USB cable problem.
    • If you're a manufacturer, blah blah major and minor device numbers

    Looking for this device;

    • /dev/SLAB_USBtoUART

    Do you have the driver software installed?

    • find /Library/Extensions/SiLabsUSBDriver.kext

    Is the driver loaded?

    • kextstat | grep -i silabs

    Loadin the driver:

    • sudo kextload /Library/Extensions/SiLabsUSBDriver.kext

    This does something:

    • ioreg -p IOUSB -l

    watch console.app and plug device in.