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RepRapper
RepRapper

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Beware fake multi-meter leads
I bought these multi-meter leads on eBay for £2.99. They are advertised as "16PCS/Set Multimeter Probe Pin Test Leads Cable Multifunction Digital Clip Kit". I was attracted to them by the large number of accessories including pin type plugs that fit old ana...
Beware fake multi-meter leads
Beware fake multi-meter leads
hydraraptor.blogspot.com
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Avoiding annoying Blogger cookie warnings
Being warned by every web site that it uses cookies is very annoying. I don't see how it is useful because virtually every site uses cookies. When looking at a Blog hosted by Blogger it is even more annoying because it warns for every new page of a blog vis...
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ESP8266 SPI Spy
I came across a very useful post by Thomas Scherrer that describes how to read data from a Peacefair PZEM-021 energy meter by spying on the SPI bus with an Arduino. I decided to do the same thing with an ESP-12F WiFi module so that I could view the results ...
ESP8266 SPI Spy
ESP8266 SPI Spy
hydraraptor.blogspot.com
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ESP8266 contention during programming
To put the ESP8266 into serial programming mode it needs to be reset with GPIO 2 held high, GPIO 15 low and GPIO 0 low. On the other hand to start it executing flash GPIO 0 needs to be high during reset. I have seen lots of circuits on the web, for example ...
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Printed ESP-12 module breakout adapter
I plan to make a few projects based around ESP-12F WiFi modules. These are postage stamp sized modules containing an ESP8266 chip plus 4MB of flash. The ESP8266 chip is a 32 bit MCU with an integrated WiFi transceiver and TCP/IP stack. They come programmed ...
ESP-12 module breakout adaptor
ESP-12 module breakout adaptor
hydraraptor.blogspot.com
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Avoiding voids
The thinnest practical wall you can print, (with Skeinforge at least), is two extrusion widths wide. Any bigger leaves a gap, until you get to three extrusions wide, and then you get infill in between them. If the wall is exactly two extrusions wide then th...
Avoiding voids
Avoiding voids
hydraraptor.blogspot.com
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Fretting corrosion
Long ago I noticed friction fit connectors are not reliable in 3D printers:  hydraraptor.blogspot.co.uk/2011/06/reliable-connections . For example, 0.1" Molex connectors that are rated for 3A burn out when only carrying 1A motor currents. Even signal connec...
Fretting corrosion
Fretting corrosion
hydraraptor.blogspot.com
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Will it burn
I always intended to put lots of different tool heads on HydraRaptor
but after being a milling machine for a while it got stuck as a 3D
printer until I started making Mendel90 kits and then it sat gathering
dust. Back in 2009 I bought a 1W 808nm infra re...
Will it burn
Will it burn
hydraraptor.blogspot.com
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Adding weight
Sometimes it is desirable to make 3D printed items with heavy bases, so that they stand up or are not easily moved. An example is this base I made to hold two tiny PCBs. They are Hall effect isolated current to voltage converters that I plan to use to meas...
Adding weight
Adding weight
hydraraptor.blogspot.com
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Mooshimeter Mod
Last year I bought a Mooshimeter wireless 2-channel multimeter. It is a multimeter front end that links to your mobile phone with Bluetooth and displays the results in an app. It is handy because you can read it remotely, it can measure voltage and current ...
Mooshimeter Mod
Mooshimeter Mod
hydraraptor.blogspot.com
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