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Mike James

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Hello,

I want to try making my own paper pulp packaging for a project. It's how egg boxes are made - The Idea is to blend newspaper with hot water into pulp and put it into a mould. Now I don't have access to a vacuum press so I'm looking for any suggestions for moulding.

Thanks,

Mike
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John Bump's profile photoMike James's profile photo
5 comments
 
Great suggestions guys, I will commence trials soon and post the results.

Mike
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Dirt simple, idiot-proof continuity tester to free up an Arduino for better projects.
 
So, I've got an #electronics problem that's been bothering me most of this week. I built a continuity tester for the QA department at work. The reason for making it bespoke like that is to eliminate operator error. In other words, I had to idiot-proof it.
The tester has two big lights on it, one green and one red.
When the tester is powered on, the red light goes on.
If a part is inserted into the stand and completes the circuit, the red light goes off and the green light goes on. The schematic I linked is more or less how the tester works in principle. One LED is illuminated until it gets a signal from one of the analog pins (continuity), at which point it switches to the other LED.

The problem is that right now it's using an #Arduino to drive a pair of transistors to switch between two 12V high-powered LEDs. I say problem because I think using an Arduino for this is total overkill, even for idiot-proofing.

What I want to make is a continuity tester that runs two LEDs, red when on and green when continuity is detected, using the absolute bare minimum of components. I don't want anything more sophisticated than a #555 timer chip on this setup; just caps, resistors, transistors, and maybe a relay or two. There's plenty of #DIY continuity tester diagrams out there, but they all work on the ON/OFF principle when I need something more like A/B if that makes sense. 
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Cindy Thornton's profile photoBruce Fleming's profile photo
6 comments
 
If you want to keep the programmability of the project but use a smaller AVR, try adapting this tutorial: http://www.instructables.com/id/The-Idiots-Guide-to-Programming-AVRs-on-the-Chea/?ALLSTEPS#intro

You can learn how to program AVRs in C as an alternative. There are different tutorials such as this one: http://hackaday.com/2010/10/23/avr-programming-introduction/

Here is a book I am currently using: Make: AVR Programming, by Elliot Williams.

For either C experience, all you need is an Arduino to program your AVR: https://www.arduino.cc/en/Tutorial/ArduinoISP

Note in the sketch for the Arduino as ISP, you can add three LEDs that help with the device - Heartbeat - running progam, Error, and in communication with slave.
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I need help! I have a html page. I want to put a button on there that sends this: http://192.168.1.21/?r=0&g=0&b=0

I just don't want it to accually go to that page but only 'post' the data and stay on the same page.

I read something about doing it with ajax but i am unknown with ajax aswell as javascript and php.

Can anyone make me an example?
(I need 6 of those buttons on one page)
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Fredrik Wiberg's profile photoMano Biletsky (Open MAKER)'s profile photo
6 comments
 
I will try to do it myself, but if i can't manage it myself i will contact you.
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Aaron Maurer

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Students Need The Truth! http://wp.me/p4covo-1B3 
This is a request. A major game changing request. One that I think will not only challenge some of you to actually speak up, but one that will allow honesty and
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Vinay Shenoy

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Hey guys, Need a help. Iam working on a mini project. How can I control the direction of a small 5ft Meteorological/weather balloon? . The problem is that , the load bearing capacity of this kind of airborne balloon is very less of about 500gms. I have to equip the electronics which are about 400gms or so.Do I need to add propellers? If yes, what sort of ? I'm not in a position to sort this neither I am able to use a larger balloon.

Also let me know different ways of controlling an airborne balloon in terms of direction. Please help me folks asap!
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John Shovic

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How to mount, measure and test an I2C Compass on your Raspberry Pi / Arduino Project. Positioning and isolation.
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Jerry Ellsworth

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Hoping someone can give me advice. I bought a few of these BLE chips thinking they would have breadboard holes I could solder headers to:
http://www.amazon.com/gp/product/B00O2TTUEW?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00

Instead there are tiny, indented contact points on the side of the board that I have no idea how to deal with. The spacing is much closer than a breadboard as well.

Any suggestions? Thanks!
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Matt Smith's profile photoJerry Ellsworth's profile photo
5 comments
 
Thanks Liam. That sounds like a great trick, although I think I need more skill (or practice) to pull it off. I think I trashed my first chip in the effort. Luckily they were cheap :-)

Matt, that pic helps a lot. I'll try that with my next one.
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Matthew Lawson

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Does anyone have a spare ZXMP6A13F 60 V P channel MOSFET SOT23 or equivalent? Both DigiKey and Mouser are back ordered and I need to make a repair to my radio before ARRL Field Day. Its for an Icom 821H. I have lost my transmit on 70cm. I am hoping someone has one in their parts drawer. If anyone knows of a supplier with them in stock that would be awesome too! Thanks in advance. 
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Matthew Lawson's profile photoLonnie Honeycutt's profile photo
6 comments
 
That's awesome Matthew.
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John Shovic

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New tutorial: measuring current on devices plugged into Raspberry Pi and Arduino projects with the INA3321 3 channel current device.
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John Shovic

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This is a tutorial for Grove Connector Projects. Three simple projects are described for the Raspberry Pi and Arduino with pictures and software.
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Vinay Shenoy

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Hey guys! I am planning to do a hobbyist diy open source project this month. Can anyone help me in finding the best one. My areas of interest are embedded systems, bionics, wireless communication. I wish to do any project that has real world application with tremendous human benefits. Waiting for any early reply.
Please let me know asap!
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Kevin Chen's profile photoVinay Shenoy's profile photo
2 comments
 
Thanks +Kevin Chen​
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John Shovic

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SwitchDoc Labs has now made the cover three times in Raspberry Pi Geek Magazine. MouseAir, the I2C Mux and wind power on Project Curacao.
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John Shovic

Project Help  - 
This series of articles discusses the use of XML for the Raspberry Pi. In part 3 we see how XML is used as a client/server application.
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John Shovic

Project Help  - 
This series of articles will discuss the use of XML on applications for the Raspberry Pi. Part One covers the format of the data structures.
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