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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Hardware Development’ Category

Poundland lights unexpected feature and USB mod. to operate christmas lights using USB – YouTube

Posted by jpluimers on 2020/11/09

Cool video with nice ideas:

–jeroen

Posted in Development, Hardware Development | Leave a Comment »

PoE to ethernet + micro USB converters

Posted by jpluimers on 2020/11/06

The first is 100mbit, some do not get it to work with Raspberry Pi 3B+, but others do get it to work, even at 1Gbit:

The second is 1Gbit, about 40% more expensive, but just works:

Via: [WayBack] Thread by @Nick_Craver: “Shout out to @mstum for reminding me 1Gb PoE USB splitters are completely viable for Raspberry Pis – now running a fi PoE switches and using just 1 outlet on the UPS: … Less wiring and if the network’s […]”

–jeroen

Posted in Development, Hardware Development, Power User, Raspberry Pi | Leave a Comment »

Good tips for powering any kind of LED strips from the Adafruit NeoPixel Überguide | Adafruit Learning System

Posted by jpluimers on 2020/10/22

Read these tips before playing with any kind of LED strips: [WayBack] Powering NeoPixels | Adafruit NeoPixel Überguide | Adafruit Learning System.

There are more, but these are the most important:

  • When connecting NeoPixels to any live power source or microcontroller, ALWAYS CONNECT GROUND (–) BEFORE ANYTHING ELSE. Conversely, disconnect ground last when separating.
  • Adding a 300 to 500 Ohm resistor between your microcontroller’s data pin and the data input on the first NeoPixel can help prevent voltage spikes that might otherwise damage your first pixel. Please add one between your micro and NeoPixel.
  • Before connecting a NeoPixel strip to ANY source of power, we very strongly recommend adding a large capacitor (1000 µF, 6.3V or higher) across the + and – terminals. This prevents the initial onrush of current from damaging the pixels.
  • Be extremely cautious with bench power supplies. Some — even reputable, well-regarded brands — can produce a large voltage spike when initially switched on, instantly destroying your NeoPixels!
    If you use a bench supply, do not connect NeoPixels directly. Turn on the power supply first, let the voltage stabilize, then connect the pixels (GND first).

Via: [WayBack] Bouw je eigen ledtafel – Tot slot – Achtergrond – Tweakers

–jeroen

Posted in Arduino, Development, Hardware Development, Hardware Interfacing, Raspberry Pi | Leave a Comment »

LED Chaser with only 4017 – YouTube

Posted by jpluimers on 2020/10/21

Cool:

The triggering in this case is the result of a main power drop and recover. The battery is unable to keep the votage at 9V level at the very moment any led is turned on, the voltage is droped down. That is what makes pin 14 to get the clock pulse so the 4017 shifts to the next led. The moment the led is off and right before the next led is turned on the main power gets recovered. When the next led is on again, the main power drops down, and so on.

Schema but less explanation on: [WayBack] LED Chaser with only 4017 – RevealNew

–jeroen

Read the rest of this entry »

Posted in Development, Electronics Development, Hardware Development | 1 Comment »

Front Panel Audio Connector and Header Pinouts for Intel® Desktop: AC97 and HD Audio have the same layout…

Posted by jpluimers on 2020/09/21

Same layout, but different pin usage for AC97 and HA Audio headers: [WayBack] Front Panel Audio Connector and Header Pinouts for Intel® Desktop…

Much more background information at [WayBack] HD Audio or AC97 connector – Which to use when, and what’s the difference? – Super User

Via: [WayBackWTF? The connectors for HD Audio and AC’97 are pin compatible (so the connectors fit) but have different signals. Who came up with this stupid idea? – Thomas Mueller (dummzeuch) – Google+

–jeroen

Read the rest of this entry »

Posted in Development, Hardware Development, Power User | Leave a Comment »

 
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