Blog
Larsplatoon writes:
After 2 long years of on-and-off work my coilgun project is finally completed. For anyone who doesn’t know what a coilgun is, it’s a gun that fires a projectile with magnetic force instead of gunpowder. The projectile from this gun won’t kill a person, but the electrical energy stored in the capacitors is 78 times the lethal amount for human beings so this is no toy.
Some technical data:
- Action: single stage, bolt
- Power supply: 12V NiMH battery (fires about 15 times/charge)
- Charging: 40 watt regulated ZVS flyback driver (charge time ~30s)
- Capacitor bank: 4x 3900uF @ 400VDC
- Stored electrical energy: ~1.25kJ
- Switch: SCR
- Efficiency: unknown, probably 1-3%
- Body: lightweight ABS plastic pipe and sheets
Portable 1.25kJ Coilgun - [Link]
Visual 6502 is a javascript simulation of the venerable 6502 processor, that can run in your web browser. Check it out. [via]
Visual 6502 javascript simulation – [Link]
Low Cost, Long Range, Reliable Wireless Sensors.
Salt Lake City UT, USA – Monnit Corporation introduces a low cost, reliable wireless temperature monitoring kit. The kit includes 2 wireless temperature sensors and a USB wireless reciever. The sensors transmit all of the sensor data through your local PC to your choice of either the MonnitSphere™ Online Monitoring Service or the Monnit Express™ standalone PC software. The sensor data is then checked against user defined thresholds to determine if a notification should be sent to the user via email or SMS text message. Read the rest of this entry »
This project shows how to program a PIC microcontroller for timer application. The author uses PIC16F628A for demonstrating the timer application that allows you to set any time between 0 to 99 min (in step of 1 min). You can turn on any device for the set time interval. An LCD display with three tact switches provide easy interface for the user to set the time, and perform Start/Stop operation of the timer.
0 to 99 Min Timer using PIC Microchip - [Link]
Garrett Mace of macetech.com has announced his first open source hardware project with the release of ChronoDot.
Over the past few years, a lot of small electronics hardware businesses have been starting up. Many of the more successful businesses and projects have adopted “open-source” philosophy into some or all of their products. Open-source concepts have been in existence for a long time…it’s human nature to share information and explain how we made something. At the same time, there is what appears to be a conflicting desire to keep processes secret in fear of duplication.
So our first open-source product is a pretty simple design, the ChronoDot RTC breakout board based on the Maxim D3231 temperature compensated realtime clock chip. Design files for Eagle are included on the product page, or at this link: http://macetech.com/oshw/ChronoDotDesignFiles.zip
ChronoDot is now Open Source - [Link]
This project shows how to control the temperature of a soldering hotplate by using a proportional integral controller (PID) module. The plate is capable of reaching 500F, hot enough for reflow soldering. A thermocouple is used to monitor the temperature of the plate. There is also a PID Controlled Solder Paste Fridge to maintain its shelf life.
PID Controlled Soldering Hotplate – [Link]
User cedtlab writes:
This Instructable will show how to make a colourful dice using the technique of charlieplexing with RGB LEDs. The project uses 7 RGB LEDs arranged in the form of dice. Each RGB LED has three separate LEDs inside so that makes a total of 21 LEDs and they have been controlled by 4 I/O pins of ATTiny13V Microcontroller. But according to the theory of CharliePlexing,we can only control 12 {n(n-1)} LEDs from 4 I/O Pins.
A CharliePlexed RGB LED Dice - [Link]
This project is a LED police lights based in Arduino board. The resulting effect is really nice.
Simple Arduino L.E.D Police Lights – [Link]
user Davuzz11 writes:
This instructable will show you how to create a dice using Arduino and few components. It’s an easy and fun project, suitable for beginners and those who want to start with Arduino; it also requires a minimal amount of components. This explaines how to create it in the breadboard, how to solder it and how to make some changes.
Arduino Led Dice – [Link]
This project shows how to build a solid state relay based on opto-triac and triac. The opto-triac isolates the output from the input. With this solid state relay you are able to switch high current loads like with a normal relay. Another advantage of this relay is that it can switch loads fast. Check schematics on the link below.
Solid state relay - [Link]
