Posts Tagged RPi

Raspberry Pi: White OLED Display

The white OLED displays measure 1.3 inches diagonally:

RPi OLED Display - white on black

RPi OLED Display – white on black

They’re plug-compatible with their 0.96 inch blue and yellow-blue siblings.

All of them are absurdly cute and surprisingly readable at close range, at least if you’re as nearsighted as I am.

Some preliminary fiddling suggests a Primary Red filter will make the white displays more dark-room friendly than the yellow-blue ones. Setting the “contrast” to 1 (rather than the default 255) doesn’t (seem to) make much difference, surely attributable to human vision’s logarithmic brightness sensitivity.

I must conjure some sort of case atop a bendy wire mount for E-Z visibility.




Crystal Parameter Measurement Musings

In order to probe a crystal’s response with decent resolution, I need a gadget to step a decent-quality sine wave by 0.01 Hz across the 10-to-100 kHz range and a logarithmic front end with a decent dynamic range. That’s prompted by looking at crystal responses through the SA’s 30 Hz resolution bandwidth:

Quartz Resonator 32.765 kHz - 34.6 pF

Quartz Resonator 32.765 kHz – 34.6 pF

Mashing a cheap AD9850/AD9851 DDS board against an Arduino Pro Mini, adding a knob, and topping with a small display might be useful. A Raspberry Pi could dump the response data directly into a file via WiFi, which may be more complication that seems warranted.

The DDS boards come with absurdly high-speed clock generators of dubious stability; a slower clock might be better. A local 10 MHz oscillator, calibrated against the 10 MHz output of the HP 3801 GPS stabilized receiver would be useful. If the local oscillator is stable enough, a calibration adjustment might suffice: dial for 10 MHz out, then zero-beat with the GPS reference, so that the indicated frequency would be dead on to a fraction of 1 Hz.

The HP 8591 spectrum analyzer has a better-quality RF front end than I can possibly build (or imagine!), but, at these low frequencies, a simple RF peak detector and log amp based on the ADL5303 or ADL5306 should get close enough. One can get AD8302 / AD8310 chips on boards from the usual low-budget suppliers; a fully connectorized AD8310 board may be a good starting point, as it’s not much more than the single-connector version.

With frequencies from 10 kHz to 100 kHz coming from a local oscillator, one might argue for a synchronous detector, formerly known as a lock-in amplifier. A Tayloe Detector might be a quick-and-dirty way to sweep a tracking-filter-and-detector over the frequency range. Because it’s a tracking generator, the filter bandwidth need not be very tight.

At some point, of course, you just digitize the incoming signal and apply DSP, but the whole point of this is to poke around in the analog domain. This must not turn into an elaborate software project, too.


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Raspberry Pi Slowdown

At first, the yard camera worked fine, but a few days later the stream of JPEG images would unpredictably stall. I connect to it through a public-key SSH session and, sometimes, the login would stall for tens of seconds and, with a session set up, various exciting operation like, say, htop would unpredictably stall; if I waited long enough, they’d complete normally.

This seemed familiar:

Samsung 16 GB Evo MicroSD card

Samsung 16 GB Evo MicroSD card

It’s a known-good card from a reputable supplier, not that that means much these days. The camera flash highlights the gritty silkscreen (?) texture of the orange overlay, but the production value seems high enough to pass muster.

Popping the card in my desktop PC showed:

  • It remains functional, at least to the extent of being mount-able and write-able
  • 3probe --time-ops /dev/sdb showed it still held 16 GB
  • fsck -fv /dev/sdb[12] shows no problems
  • Both partitions looked good

So I shrank the main partition to 7.5 GB, copied the image to the desktop PC’s SSD, fired up the Token Windows Laptop, ran the Official SD Card Formatter, and discovered that it thought the card had only 63 MB (yes, MB) available. That’s the size of the FAT boot partition, so I returned the card to the desktop PC, unleashed gparted on it, blew away the partitions, reformatted the whole thing to one 16 GB FAT32 partition, and stuck it back in the laptop, whereupon the Official Formatter agreed it had every byte it should.

A format-with-overwrite then proceeded apace; the card doesn’t support format-with-erase.

Back in the desktop, I copied the saved image back onto the card which, en passant, blew away the just-created FAT format and restored the Raspbian partition structure. The 8 GB of that copy proceeded at an average 12.1 MB/s. I did not watch the transfer closely enough to notice any protracted delays.

Back in the Pi, the card booted and ran perfectly, sending an image every second to the laptop (now running its usual Mint Linux) on the guest network:

Turkey flock in driveway - 2017-03-21

Turkey flock in driveway – 2017-03-21

SSH sessions now work perfectly, too, and commands no longer jam.

So it seems a good-quality MicroSD card can experience protracted delays while writing data, to the extent of tens of seconds, stalling the Pi in mid-operation without producing data errors or any other symptoms.

It’s not clear the Official Formatter does anything that simply copying the image back to the card wouldn’t also accomplish, although overwriting the entire 16 GB extent of the card exercises all the cells and forces the card controller to re/de/un/allocate bad blocks. If, indeed, the blocks are bad, rather than just achingly slow.

Moral of the story: Don’t use MicroSD cards as mass storage devices, at least not for industrial applications that require consistent performance.



Raspberry Pi Yard Camera

The yard camera I mentioned a few days ago consists of a Raspberry Pi 3 with an Official V2 Pi Camera peering through two layers of 1955-era window glass into our back yard:

Back Yard Camera setup - 2017-03-13

Back Yard Camera setup – 2017-03-13

Yes, that’s black duct tape holding it to the window pane. The extension cord draped across the floor gotta go, too.

This being a made-in-haste lashup, I used the streamEye MJPEG HTTP streamer, started from /etc/rc.local in the usual way:

logger -s Starting camera streamer
sudo -u pi sh -c '/home/pi/' &
logger -s Camera running

The script feeds one moderate-quality frame to the streamer every second:

/home/pi/streameye/extras/ -w 1280 -h 720 -r 1 -q 80 | streameye

MJPEG has a lot to dislike as a streaming video format. In particular, without any hint of inter-frame compression, the network usage gets way too high for any reasonable frame rate.

But it got the camera up & running in time for the March snowfall:

Fun in Snow - 2017-03-15

Fun in Snow – 2017-03-15

In a nod to IoT security, the Raspberry Pi’s wireless interface sits behind the router’s firewall on our guest network, with no access to the devices on our main network. The router passes a one-port peephole from the Internet to the Pi, which protects all the other services from unwarranted attention.

The router maintains a dynamic DNS record with a (not particularly) mnemonic URL, which seems better than an ever-changing dotted-quad IP address.

Because the router doesn’t support hairpin connections from the main network to the guest network, I can’t monitor the video from my desktop through the outwardly visible URL. Instead, I must fire up a laptop, connect to the guest network, then connect directly to the camera at camera.local.

You do not have a Need To Know for the URL; I’m sure it’ll appear on Shodan. I plan to take it down when the snow melts.


Raspberry Pi Streaming Radio Player: OLED Display

With the OLED wired up to the Raspberry Pi, the LUMA.OLED driver makes it surprisingly easy to slap text on the screen, at least after some obligatory fumbling around:

RPi OLED Display - Plenitude

RPi OLED Display – Plenitude

Connect the hardware, install the driver, then the setup goes like this:

import textwrap

from luma.oled.device import sh1106
from luma.core.serial import spi
from luma.core.render import canvas
from PIL import ImageFont

… snippage …

font1 = ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf',14)
font2 = ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf',11)

wrapper = textwrap.TextWrapper(width=128//font2.getsize('n')[0])

StatLine = 0
DataLine = 17           # allow for weird ascenders and accent marks
LineSpace = 16

Contrast = 255          # OLED brightness setting

serial = spi(device=0,port=0)
device = sh1106(serial)

The Python Imaging Library below the LUMA driver supports Truetype fonts that look much better than the default fonts. For these tiny displays, DejaVu Sans comes close enough to being a single-stroke (“stick”) font and, being proportional, packs more text into a fixed horizontal space.

The textwrap library chops a string into lines of a specified length, which works great with a fixed-width font and not so well with a proportional font. I set the line length based on the width of a mid-size lowercase letter and hope for the best. In round numbers, each 128 pixel line can hold 20-ish characters of the size-11 (which might be the height in pixels) font.

It also understands hyphens and similar line-ending punctuation:

Felix Mendelssohn-
Bartholdy - Piano
Concerto No.01 in

It turns out whatever library routine blits characters into the bitmap has an off-by-one error that overwrites the leftmost column with the pixel columns that should be just off-screen on the right; it may also overwrite the topmost row with the bottommost row+1. I poked around a bit, couldn’t find the actual code amid the layers of inherited classes and methods and suchlike, and gave up: each line starts in pixel column 1, not 0. With textwrap generally leaving the rightmost character in each line blank, the picket-fence error (almost) always overwrites the first column with dark pixels.

Display coordinates start at (0,0) in the upper left corner, but apparently the character origin corresponds to the box around an uppercase letter, with ascenders and diacritical marks extending (at least) one pixel above that. The blue area in these displays starts at (0,16), but having the ascenders poke into the yellow section is really, really conspicuous, so DataLine Finagles the text down by one pixel. The value of Linespace avoids collisions between descenders and ascenders in successive lines that you (well, I) wouldn’t expect with a spacing equal to the font height.

The display has a variable brightness setting, called “contrast” by the datasheet and driver, that determines the overall LED current (perhaps according to an exponential relationship, because an α appears in the tables). I tweak the value in Contrast based on where the streamer lives, with 1 being perfectly suitable for a dark room and 255 for ordinary lighting.

The LUMA package includes a scrolling terminal emulator. With maybe four lines, tops, on that display (in a reasonable font, anyhow), what’s the point?

Instead, I homebrewed a panel with manual positioning:

def ShowStatus(L1=None,L2=None,L3='None'):
  with canvas(device) as screen:
    screen.text((127-(4*font1.getsize('M')[0] + 2),StatLine),'Mute' if Muted else ' ',

    screen.text((1,DataLine + 1*LineSpace),L2,
    screen.text((1,DataLine + 2*LineSpace),L3,

Yeah, those are global variables in the first line; feel free to object-orient it as you like.

The LUMA driver hands you a blank screen inside the with … as …: context, whereupon you may draw as you see fit and the driver squirts the bitmap to the display at the end of the context. There’s apparently a way to set up a permanent canvas and update it at will, but this works well enough for now.

That means you (well, I) must mange those three lines by hand:

ShowStatus('Startup in ' + Location,
           'Mixer: ' + MixerChannel + ' = ' + MixerVol,
           'Contrast: ' + str(Contrast))

Chopping the track info string into lines goes like this:

if TrackName:
  info = wrapper.wrap(TrackName)
             info[1] if len(info) > 1 else '',
             info[2] if len(info) > 2 else '')
  ShowStatus('No track info','','')

Something along the way ruins Unicode characters from the track info, converting them into unrelated (and generally accented) characters. They work fine when shipped through the logging interface, so it may be due to a font incompatibility or, more likely, my not bothering to work around Python 2’s string vs. byte stream weirdness. Using Python 3 would be a Good Idea, but I’m unsure all the various & sundry libraries are compatible and unwilling to find out using programming as an experimental science.

The Python source code as a GitHub Gist:



Raspberry Pi: OLED Display

These cute displays have barely enough dots for the job:

RPi OLED Display - Classical

RPi OLED Display – Classical

That’s a 0.96 inch = 24.4 mm OLED display, measured diagonally, with a breathtaking 8192 = 128×64 dots. It’s a binary display: on or off pixels, nothing in between. This is not a color display: what you see is what it does, with a two-pixel void between the yellow and blue sections.

The void is a physical separation that does not affect the display addressing: the yellow section has 16 rows, the blue section has 48. It’s your responsibility to keep things where they belong; a character descender from the yellow section will appear in the blue section.

They’re three bucks each, shipped halfway around the planet: search eBay / Amazon for oled 128x64 yellow. The all-blue and all-white versions do not have the two-pixel void. I have some white 1.3 inch versions on the way for those applications requiring 35% more visibility.

The SPI interface uses all seven wires, peeled from a premade 100 mm 40-pin cable with female pin connectors:

RPi OLED Display - Wiring

RPi OLED Display – Wiring

Other OLED versions have a four-wire I2C interface. The boards have option jumpers on the back, but the pin header along the edge will have 7 holes for SPI or 4 holes for I2C .

Caveat emptor for online buyers: the item picture(s) may not match the title or the description text. The low-end sellers carrying beach balls, cookware, MOSFETs, cheap consumer electronics, and OLEDs do not understand the tech on a small board that’s Just Another SKU among thousands.

For cables, search eBay or Amazon for ribbon dupont "female to female" 10cm. Amazon has sets of male-female, male-male, and female-female jumpers for ten bucks in various lengths. The insulation seems rather stiff and I may be forced to build better cables with fine wire inside PET braid.

The SPI interface soaks up a tidy block of pins on the RPi’s big header:

RPi OLED Display - RPi connector detail

RPi OLED Display – RPi connector detail

The LUMA-OLED Python driver doc gives a useful summary of those connections, herewith extracted for future reference:

  • 17 VCC – 3.3 V works for sure, 5 V might not
  • 18 DC – Data/Command
  • 19 D1 (“dee one”) – Data to display = MOSI
  • 20 GND
  • 21 not used, that’s the pin in the midst of the block
  • 22 RST – Reset
  • 23 D0 (“dee zero”) – clock to display = SCLK
  • 24 CS – Chip Select = CE0 (“cee ee zero”)

Pin 1 is in front on the left end of that picture, closest to the MicroSD card slot, and proceeds 1-2, 3-4, and so forth along the length of the connector: odds toward the CPU, evens toward the PCB edge.

The LUMA-OLD maintainter must have OLED boards with a slightly different SPI pinout than mine: VCC and GND are interchanged. Caveat emptor!

Obviously, it’s desperately in need of a cute little case, which is in the nature of fine tuning.




Streaming Radio Advertisements: Carpet Bombing

After a protracted silence in a Radionomy stream, the Raspberry Pi player offered this log:

2017-03-05 11:17:07,890 INFO: Starting mplayer on Plenitude -> /home/pi/Playlists/Radio-PLENITUDE.m3u
2017-03-05 11:17:13,651 INFO: Track name: []
2017-03-05 11:44:02,296 INFO: Track name: [David Wahler - Whispers from Eternity]
2017-03-05 11:46:36,995 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 11:47:07,117 INFO: Track name: []
2017-03-05 11:49:07,080 INFO: Track name: [Radio PLENITUDE - Jingle Extro Publicité]
2017-03-05 11:49:10,079 INFO: Track name: [Jef Mounet & Danièle Mounet - L'ancre musicale Natures d'Eau]
2017-03-05 12:02:02,271 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 12:02:32,424 INFO: Track name: []
2017-03-05 12:04:32,243 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 12:05:01,925 INFO: Track name: [Targetspot - TargetSpot]
2017-03-05 12:07:02,276 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 12:07:31,968 INFO: Track name: [Targetspot - TargetSpot]
2017-03-05 12:09:32,262 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 12:10:02,192 INFO: Track name: [Targetspot - TargetSpot]
2017-03-05 12:12:02,311 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 12:12:32,184 INFO: Track name: [Targetspot - TargetSpot]
2017-03-05 12:14:32,085 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 12:15:02,217 INFO: Track name: [Targetspot - TargetSpot]
2017-03-05 12:17:02,057 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 12:17:32,445 INFO: Track name: [Targetspot - TargetSpot]
2017-03-05 12:19:32,083 INFO: Track name: [Radio PLENITUDE - Jingle Extro Publicité]
2017-03-05 12:19:35,171 INFO: Track name: [Jean-Marc Staehle - Bercé par tant de beauté]
2017-03-05 12:23:42,410 INFO: Track name: [Francesco - Sur le chemin]
2017-03-05 12:29:50,265 INFO: Track name: [Michel Pépé - Pacifica]
2017-03-05 12:35:07,493 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 12:35:37,377 INFO: Track name: [Targetspot - TargetSpot]
2017-03-05 12:37:37,478 INFO: Track name: [Radio PLENITUDE - Jingle Extro Publicité]
2017-03-05 12:37:41,476 INFO: Track name: [Music And Wellness (Musique Et Bien Etre) - Absolute Winner]
2017-03-05 12:46:36,742 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 12:47:06,668 INFO: Track name: [Targetspot - TargetSpot]
2017-03-05 12:49:06,538 INFO: Track name: [Radio PLENITUDE - Jingle Extro Publicité]
2017-03-05 12:49:10,270 INFO: Track name: [Patrick Vuillaume &Nicole Bally - Pearls of Light (Instrumental by Nicole Bally)]
2017-03-05 12:53:45,357 INFO: Track name: [Trine Opsahl - Sister moon]
2017-03-05 12:54:58,596 INFO: Track name: [Peter Kater - Rebirth]
2017-03-05 13:04:52,726 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 13:05:22,665 INFO: Track name: [Targetspot - TargetSpot]
2017-03-05 13:07:21,561 INFO: Track name: [Radio PLENITUDE - Jingle Extro Publicité]
2017-03-05 13:07:25,808 INFO: Track name: [Deuter - Flowing]
2017-03-05 13:12:55,970 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 13:13:25,859 INFO: Track name: []
2017-03-05 13:15:26,449 INFO: Track name: [Radio PLENITUDE - Jingle Extro Publicité]
2017-03-05 13:15:33,022 INFO: Track name: [Radio PLENITUDE - Jingle Intro Publicité]
2017-03-05 13:15:59,437 INFO: Track name: [Targetspot - TargetSpot]
2017-03-05 13:17:59,559 INFO: Track name: [Radio PLENITUDE - Jingle Extro Publicité]
2017-03-05 13:18:06,133 INFO: Track name: [O - Part I]

The Jingle lines introduce a short interlude of chimes separating music from advertisements. The Intro chimes play for 30 seconds and the Extro chimes play for three to five seconds. Some stations have similar interludes, others do not; apparently the station gets to choose the format.

The [Targetspot - TargetSpot] lines mark two minutes of TargetSpot insertion: either advertisements (if you’re in their target market) or generic musical interludes similar to the station’s genre (if you’re out-of-market). The ads and music often lack volume-matching with the streaming music, rarely have lower volume, and the ads are incomprehensible to my ears. The musical interludes seem to be randomly chosen from a small set of candidate tracks that, along with the chimes, become annoyingly familiar in short order.

The [] lines (yes, an empty string) mark two minutes of Public Service Announcements, advertisements, or generic musical interludes. I’m uncertain how they differ from the [Targetspot - TargetSpot] insertions.

At a minimum, Radionomy inserts two minutes of TargetSpot / PSAs after every 12 to 15 minutes of music. Adding in the Jingle markers, ads occupy just under 20% of the total “airtime” for this station.

However, bizarre events like the 17 nonstop minutes of jingles and ads inserted just after noon occur with inexplicable frequency. I’ve noticed half an hour of similar back-to-back-to-back ads on other stations, so it’s not a rare event.

To quote the TargetSpot website:

TargetSpot serves ads in real time to each listener’s personalized stream, creating a one-to-one relationship between the advertiser and the listener. The result is a dramatic increase in message relevancy and campaign effectiveness

Those keyword markers turn out to be incredibly convenient. Just sayin’…

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