via gitter.im/pi-hole/pi-hole: [WayBack] Blocklist Collection ¦ Firebog
Pi-hole compatible blocklists for you to have a more enjoyable online presence
Thanks Mark Drobnak @Mcat12 for suggesting this.
–jeroen
Archive for the ‘Hardware Development’ Category
Blocklist Collection ¦ Firebog
Posted by jpluimers on 2019/10/25
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Fastener Reference Cheat Sheets, by @pighixxx | #ManufacturingMonday
Posted by jpluimers on 2019/10/04
[WayBack] Fastener Reference Cheat Sheets, by @pighixxx | #ManufacturingMonday
From pan flange to button washer, from socket cap to trim screw heads, not to mention threading types and drive head options, every workbench and workshop should have this fastener reference guide …
via:
- [WayBack] Fastener Reference Cheat Sheets, by @pighixxx | ##ManufacturingMonday https://blog.adafruit.com/2017/11/20/fastener-reference-cheat-sheets-by-pighixxx-m… – Adafruit Industries – Google+
- [WayBack] Fastener Reference Cheat Sheets, by @pighixxx | ##ManufacturingMonday https://blog.adafruit.com/2017/11/20/fastener-reference-cheat-sheets-by-pighixxx-m… – Joe C. Hecht – Google+
–jeroen
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Skin effect – Wikipedia
Posted by jpluimers on 2019/09/23
Skin effect is the tendency of an alternating electric current (AC) to become distributed within a conductorsuch that the current density is largest near the surface of the conductor, and decreases with greater depths in the conductor. …
At high frequencies the skin depth becomes much smaller. … Because the interior of a large conductor carries so little of the current, tubular conductors such as pipe can be used to save weight and cost.
Via [WayBack] Odd: “copper” central lead of antenna cable attracted by magnetic screwdriver tip. – Jeroen Wiert Pluimers – Google+
–jeroen
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LED Voltage Drops
Posted by jpluimers on 2019/09/19
[WayBack] Dangerous Prototypes: Basic Light Emitting Diode guide – Voltage drop or forward voltage has a nice table of common LED types:
You can also measure them yourself using most multi-meters have setting for that as described in [WayBack] Easy way to figure out a LED’s Vf in order to pick an appropriate resistor – Electrical Engineering Stack Exchange
You can also measure yourself, but my Proster VC99 multi-meter (cheap, but functions well, see for instance the review in [WayBack] MagPi issue 43) can measure voltage drop, so I’ve measured some LEDs from old PC cases:
- Red: 1.8 V
- Yellow: 1.8 V
- Green: 1.8 V
- Blue: does not measure
Given that they all have the same voltage drop, I made the below table with some resistor values to get the same current through them on various voltages (3.3V, 5V and 12V) based on Standard resistor values.
Note anything less than 20mA of current usually is OK (though 20mA often is on the bright side).
LED Colour Voltage drop (Vf) Total Voltage Remaining Voltage Resistance Ω Current mA Power mW Any 1.8 5 3.2 220 14.55 46.55 Any 1.8 12 10.2 680 15.00 153.00 Any 1.8 3.3 1.5 100 15.00 22.50 Any 1.8 5 3.2 330 9.70 31.03 Any 1.8 12 10.2 1000 10.20 104.04 Any 1.8 3.3 1.5 150 10.00 15.00 Any 1.8 5 3.2 470 6.81 21.79 Any 1.8 12 10.2 1500 6.80 69.36 Any 1.8 3.3 1.5 220 6.82 10.23
Background for doing these calculations:
- [WayBack] Correct formula for LED current-limiting resistor?
- [WayBack] Why we use 330 ohm resistor to connect a LED?
- [WayBack] LED calculator: current limiting resistor value
- [WayBack] LED series/parallel array wizard
–jeroen
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(53) Introducing the “Lab in a Box” Concept – Patrick Titiano & Kevin Hilman, BayLibre – YouTube
Posted by jpluimers on 2019/08/13
Related: Introducing The “Lab in a Box” Concept (ELC-E-2017-Prague).pdf
Via:
- [WayBack] +BayLibre engineers have used a Desktop PC case for SW QA with an +Intel Celeron J1900 board acting as a software test server for 6 ##ARM development bo… – Jean-Luc Aufranc – Google+
- [WayBack] Lab in a Box Concept Embeds x86 Server and 6 ARM Boards into a PC Case for Automated Software Testing
–jeroen
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Posted in Development, Hardware, Hardware Development, Hardware Interfacing, Power User, Raspberry Pi, Software Development | Leave a Comment »
Cable salad is of all times: 1964 analog computers; Moog syntesizers
Posted by jpluimers on 2019/08/01
This picture on Flickr of Engineer Karen Leadlay in an analog computer lab at General Dynamics, January 1964 shows that cable salad is of all times.
Via:
- [WayBack] Engineer Karen Leadlay in an analog computer lab at General… • Xiss UFO today
- [WayBack] Engineer Karen Leadlay working on analog computers at General Dynamics, 1964. – Kristian Köhntopp – Google+
- [WayBack] Engineer Karen Leadlay working on analog computers at General Dynamics, 1964. – David McKeever – Google+
The above threads have really nice comments, including pointers to for instance the [WayBack] Moog synthesizer – Wikipedia (lots of you remember the songs by Keith Emerson).
–jeroen
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Sonoff Wireless Switch Family Gets a $3 IP66 Waterproof Enclosure
Posted by jpluimers on 2019/07/15
Interesting stuff from a while back that I will be using soon: [WayBack] Sonoff Wireless Switch Family Gets a $3 IP66 Waterproof Enclosure.
Pictures via CNX Software; originally found via [WayBack] $2.90 waterproof case for +ITEAD Studio Sonoff switches… – Jean-Luc Aufranc – Google+
–jeroen
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Posted in Development, ESP8266, Hardware Development, IoT Internet of Things, Network-and-equipment, Power User | Leave a Comment »
No IPMI? Use a Raspberry Pi to remotely control the power of your computer
Posted by jpluimers on 2019/07/12
Interesting project: [WayBack] WtRPM: A Web-based (Wt) suite to power up/down your computers – mupuf.org
It hooks a RaspberryPi to your ATX power supply.
Via: [WayBack] gpio – Use Raspberry Pi to control PC’s power switch – Raspberry Pi Stack Exchange
–jeroen
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Solid State vs. Electromechanical Relays | Arrow.com
Posted by jpluimers on 2019/06/27
For my reading list: [WayBack] Solid State vs. Electromechanical Relays | Arrow.com
When you need a power switching solution, you are faced with two competing technologies – electromechanical relays and solid state relays. So which is the right choice for your design?
Keywords: SSR versus EMR, SPDT
via:
- [WayBack] Seeed Studio Introduces 1 to 8 Channels Grove I2C Solid State Relay Modules
- [WayBack] Four new +Seeed SSR boards controllable over I2C. This post also includes an explanation of the advantages and disadvantages of solid state relays compa… – Jeroen Wiert Pluimers – Google+
–jeroen
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Relays and Arduino / ESP8266 / ESP8266X
Posted by jpluimers on 2019/06/19
As a follow-up on Raspberry Pi and relays – follow up on Having one Raspberry Pi reset another Raspberry Pi through relay or transistor some of my research links to bring this to Arduino, ESP8266, ESP8266X and similar devices:
- [WayBack] Home Automation – How to Add Relays to Arduino: 9 Steps
- [Archive.is] 2 way lighting circuit control with blynk and feedback updates – Projects made with Blynk – Blynk
- [WayBack] Control a Relay From Anywhere Using the ESP8266
- [WayBack] D1 [WEMOS Electronics]
- [WayBack] WiFi / Internet Controlled Relays Using ESP8266 – Quick, 30 Minutes IoT Project: 3 Steps (with Pictures)
–jeroen
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The Wiert Corner - irregular stream of stuff 