Platform3 (testing prototype)

Rayman

Actually there's Schottky diode right there so tried powering after that, ~4.8 V.
That worked color wise, but battery bank still turned out.
Going to see if two WS2816B is enough...

Rayman

Found that two WS2816B LEDs in white draws enough current to keep the battery pack on.

Tried reducing the on time to conserve power.. 50% duty like below works, but less than that doesn't seem to work...

PUB Main | pos

  strip.start_b(LEDS, STRIP_LEN)                                ' start led driver
  strip.off

  repeat
    strip.set_all(strip#white)
    pause(5000)
    strip.set_all(strip#BROWN)
    pause(5000)

macca

@Rayman said:
Was hoping that cheap USB keyboards would support PS/2 mode, but the two tested just now didn't work.

[...]

Anyway, going to go forward with dual USB wired for PS/2 instead of real PS/2 just because is smaller and looks better.

Just in case you missed it, there is a USB driver for the P1 https://github.com/SaucySoliton/propeller-usb-host

Rayman

Thanks @macca that looks better than last time I looked at it. Still, main problem there is that I/O pins have to be in 0..7 range.
Doesn't work in this particular instance...

JonnyMac

In a very large number of my P1 projects a launch an internal support cog that runs a 1ms loop and calls very tasks that have their own timing variables. It turns out that you can get quite a lot of work done in a millisecond in the P1. This might be something to consider for your controller -- you're trading one cog (WS28xx) for this; that said, you can control a standard LED and a whole lot more, and use the LED as a 1s "heartbeat" indicator.

This is the background code in the demo.

con { background cog }

var

  long  bcog                                                    ' background cog #
  long  bcstack[32]                                             ' stack for background cog

  long  millis                                                  ' global milliseconds register


pri background | t                                              ' launch with cognew()

  io.low(LED_26)

  millis := 0

  t := cnt                                                      ' sync loop timer
  repeat
    waitcnt(t += MS_001)                                        ' run loop every millisecond
    ++millis                                                    ' increment millis
    show_heartbeat


var

  long  hbms


pri show_heartbeat

  if (++hbms == 1000)
    hbms := 0

  if (hbms < 250)
    outa[LED_26] := 1                                           ' 100%
'   outa[LED_26] := hbms                                        '  50%
'   outa[LED_26] := hbms >> 1                                   '  25%
  else
    outa[LED_26] := 0

Rayman

@JonnyMac Something to keep in mind...

@macca Will see if can add pads for pulldowns so could then use for real USB using jumpers at least...

Rayman

Here's layout for VGA-PS2(on USB)-stereo-mic board, adapted from P2 version. Same size, but this one has a lot more resistors and caps...