Posted by jpluimers on 2021/03/17
They are much stronger than plastic threads, no matter how you create the plastic threads.
To make them even stronger, add shell thickness to the thread locations, either globally or by using modifier meshes. Modifier meshes work way better in Cura than in Slic3r.
–jeroen
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Posted by jpluimers on 2021/02/24
Still an interesting device: [WayBack] NanoPi NEO2 1GB Metal Complete Kit, NP-NEO2-1G-STK – Antratek Electronics:
The NEO2 Metal Complete Kit includes:
- NanoPi NEO2 1GB
- NanoHat OLED
- Aluminum housing with 3 brass buttons
- Paste and pads
- MicroUSB cable
- 8GB MicroSD Card with pre-installed FriendlyCore Ubuntu
- Screws and screw driver
- NanoPi NEO2 quick start guide
The NanoPi NEO2 LTS (Long Term Support) is a super tiny ARM board made by FriendlyElec and uses Allwinner’s 64-bit H5 quad-core SoC (ARM Cortex-A53). It has internal hexa-core Mali450 GPU and 512MB DDR3 RAM.
The NanoPi NEO2 has Gigabit Ethernet and one USB host port. These features make it especially suitable for applications that require high data throughput, high-speed data transmission and high performance.
–jeroen
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Posted by jpluimers on 2020/12/24
For my link archive (this DIN rail device allow sensing current used by a circuit; models for 5A/20A/30A).
Thanks Matthijs ter Woord for pointing me to this.
Schematics show it uses an LM317 linear voltage regulator (to get 5V out of a 8V-35V range) next to the ACS712 current sensor (based on the [WayBack] Hall effect) available in 5A, 20A and 30A varieties.
Documentation:
Schematics:
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Posted by jpluimers on 2020/11/09
Cool video with nice ideas:
–jeroen
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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
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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:
Via: [WayBack] Bouw je eigen ledtafel – Tot slot – Achtergrond – Tweakers
–jeroen
Posted in Arduino, Development, Hardware Development, Hardware Interfacing, Raspberry Pi | Leave a Comment »
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
Posted in Development, Electronics Development, Hardware Development | 1 Comment »
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: [WayBack] WTF? 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
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Posted by jpluimers on 2020/08/28
Still glad I got a few of [WayBack] GL-AR300M – GL.iNet: it makes travel life so much easier when you cannot use tethering.
I got the model GL-AR300M with external antennas (the GL-AR300M only has internal ones with a much shorter range).
Powered over USB, it runs OpenWRT and can NAT a local network towards an external network on the WAN, WiFi or (via USB) 3G/4G modem.
Despite doing only 2.4Ghz, it was a life saver in many occasions (there is a 5Ghz model, but it has over heating issues).
Posted in Development, Ethernet, GL-AR300M, GL.iNet, Hardware, Hardware Development, LifeHacker, Network-and-equipment, Power User, Raspberry Pi, routers, VPN, WiFi | Leave a Comment »
Posted by jpluimers on 2020/08/26
On my list: check if Mifare Desfire cards are still secure enough for something like a [WayBack] DIY electronic RFID Door Lock with Battery Backup – CodeProject.
Via: [WayBack] Lots of interesting info on RFID use. https://www.codeproject.com/Articles/1096861/DIY-electronic-RFID-Door-Lock-with-Battery-Backup – Lars Fosdal – Google+
–jeroen
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The Wiert Corner - irregular stream of stuff 