- Spitzenpfeil on Sleep is vital
- robert on PT4115 LED-Square
- abies on PT4115 LED-Square
- robert on ERSA I-Con Nano — A pico review
- Ubi de Feo on ERSA I-Con Nano — A pico review
Tags64-pixels adapter AVR bulb customs DSO failure by design fireworks firmware good old days hack happy new year hardware IKEA import lamp lecroy LED light lighting linux MBI5168 modding open source opensuse oscilloscope PCB power supply prototype PWM rant remote RGB RoHS Samtid Seeedstudio SMD soldering teardown trigger upgrade WaveAce 224 weller WS2812B youyue
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Author Archives: robert
Fawlty USB3.0 controller card — quick DC-DC regulator check
This card is pretty good, when it works. Transfer-speeds were fine, close to 100MB/s with an external USB3 disk. It works nicely with Linux – plug and play. Then the problems started…
Posted in Electronics. Tagged ACT4060A, buck, controller, DC-DC, efficiency, PCI-E, regulator, Renesas, TD6810, testing, USB3, µPD720202 Comments Off on Fawlty USB3.0 controller card — quick DC-DC regulator check
It looks nice on graphs, but there’s so much to not understand
Posted in Electronics. Tagged Nyquist, sampling Comments Off on It looks nice on graphs, but there’s so much to not understand
“Easy” remote-admin — static systemd service
In the previous two posts we dealt with the script ‘after.local’, which is a remnant on openSUSE of the ‘init’-days, before systemd became the standard. After looking more closely, it turns out that there is a ‘unit-file’ for ‘after.local’ backward-compatibility. … Continue reading
Posted in Computer / Server Tagged systemd, unit-file Comments Off on “Easy” remote-admin — static systemd service
“Easy” remote-admin — take 2
In my previous post I described a method for a boot-activated remote-admin option for my parents’ computer. On 2nd thought, it is not always a good idea to rely on changing system-wide configurations (such as sshd_config, firewall…) In this post … Continue reading
Posted in Computer / Server Tagged admin, iptables, linux, port forwarding, remote, router, SSH, sshd, VNC Comments Off on “Easy” remote-admin — take 2
“Easy” & quite safe remote-admin for parent’s linux machine
Yes, I know about KDE desktop sharing, FreeNX and relatives… and again yes, this is nothing new, but someone might still find it useful. I wanted and needed something simple, something that could be activated in the bootloader menu (grub … Continue reading
Posted in Computer / Server Tagged admin, linux, remote, VNC Comments Off on “Easy” & quite safe remote-admin for parent’s linux machine
Spontaneous LED bulb teardown — OSRAM AA66588 [10W]
Yes, yet another power-supply failure!
Looking for a new job…
Just to be on the safe side, not being guilty of lack of initiative, I post this on here as well ;-) I seek permanent employment in Germany, willing to move almost anywhere (*). By education I’m a physicist, dealt … Continue reading
Posted in Dear Diary. Tagged job-hunt 2 Comments
IKEA Samtid mood-light BT firmware — simple_serial
This firmware for the ISML + HC-05 Bluetooth module currently implements the same simple interface as the current WiFi-code named ‘browser_control’.
Pairing the ‘HC-05’on linux using the command line (openSUSE 13.2): When first powered on, the HC-05 module will … Continue reading
Importing LEDs from China — Battle with customs follow-up
Behold, the stickers of DOOM… If you should find any of these on a shipment to you, prepare for battle!
Posted in Electronics. Tagged aliexpress, CE, customs, follow-up, import, LED, RGB, RoHS, WS2812B 4 Comments
HZA — Won the battle, but not the war
I ordered a couple of WS2812B on Aliexpress more than THREE months ago. Boy what trouble that has conjured up! The seller on Aliexpress now probably thinks I’m a crook, because I missed an email that asked me to provide … Continue reading
Posted in Electronics. Tagged aliexpress, CE, China, customs, HZA, import, RoHS, WS2812B, Zoll 2 Comments
Status lamp on the loose — Partial oven teardown
ARGH! I can’t be having with that! I do hope this lamp is a low voltage one…
Soldering for masochists — LED indicator 0402 edition
Purple circuit boards are available on oshpark. $2.30 for a three-pack (free shipping).
Posted in Electronics. Tagged 0402, 8-bit, indicator, LED, masochistic Comments Off on Soldering for masochists — LED indicator 0402 edition
ISML + WiFi — ESP8266 finally tamed, but…
Posted in Electronics. Tagged AVR, erratic behaviour, ESP8266, IKEA, ISML, LED, mood light, RAM, RGB, Smatid, usage, WiFi, WS2812B Comments Off on ISML + WiFi — ESP8266 finally tamed, but…
ISML killed 1st power supply — short autopsy
Last night I experienced a slight audible annoyance, coming from the #ISML power supply (5V-3A). Shortly thereafter the light literally went out, permanently. I noticed a very faint smell of burnt electronics, but delayed the autopsy until today.
Posted in Electronics. Tagged autopsy, capacitor, death, ISML, power supply, teardown, vented Comments Off on ISML killed 1st power supply — short autopsy
Throwing out old trash — impromptu tear-down
Posted in Electronics. Tagged optical disc, polishing, scratch remover, teardown Comments Off on Throwing out old trash — impromptu tear-down
“Still at war with customs” — yet another letter from the HZA
To be honest, I’m not looking forward to opening this letter… …but there is no way around it.
Posted in Electronics. Tagged CE, customs, EU, import, insanity, laws, product safety, regulations, RoHS, war 4 Comments
Small project #14 — KIS-3R33S breakout — with citrus smell !
Not “pining for the fjords”, but pining for the boards!
Posted in Electronics. Tagged DC-DC, KIS-3R33S, mod, power supply Comments Off on Small project #14 — KIS-3R33S breakout — with citrus smell !
Small project #13 — AVR-ISP level shifter (VCC+I/O)
Bought a cheap AVR-ISP programmer on Ebay, and you find out that while it does provide 3.3V, it is VCC-only & your device is NOT 5V tolerant on its I/O pins. BUMMER! This little board fixes just that issue. All … Continue reading
Posted in Electronics. Tagged 3.3V, 5V, adapter, AVR, ISP, level-shifter Comments Off on Small project #13 — AVR-ISP level shifter (VCC+I/O)
Small project #12 ⅔ — IKEA Samtid mood-light BT firmware
A user of the “new” version of the lamp has undertaken the heroic task of writing the Bluetooth code for controlling it! Here’s a sneak-peak:
The “at war with customs” saga continues
Today, a Sunday, I discovered a letter in my mailbox. A LETTER FROM CUSTOMS – >> MAIN OFFICE
Posted in Electronics. Tagged CE, customs, Digikey, distributors, EU, import, laws, mouser, regulations, war Comments Off on The “at war with customs” saga continues