Tennessee State Legislator Files Bitcoin Bill

Tennessee Senator Steve Dickerson of Nashville and Representative Jeremy Faison of Cosby, have filed a bill which would allow political campaigns to accept bitcoin contributions.From the text of the bill: “Any increase in the value of digital currency being held by a candidate or political campaign committee shall be reported as interest on any statement filed…” and the bill requires the candidate to sell “ ...

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Raspberry Pi Power Supply Circuit

This Raspberry Pi power supply circuit, also known as Sally after my cat, is a high-end circuit to power the Raspberry Pi. Based on the 7805 linear voltage regulator IC, it provides a precise 5.0 V output no matter the load you put on the voltage rails. The circuit also provides a power switch and an LED indicator. Sally being my cat, is extremely intelligent, and a fully qualified electronic engineer. She ...

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A Small Project for “Newbies” : Fun Stuff : Bi-stable Multivibrator

This is the circuit of the Bi-stable Multivibrator. Either transistor can be on while the other is off, and the circuit will retain its state until it is changed by an external signal or power is turned off. Thus, this circuit represents the simplest possible binary memory. In this experiment, you will construct and demonstrate such a circuit. Schematic Diagram If, when power is first applied, Q1 turns on, ...

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Prototyping Circuit Boards

Someone recently turned me onto prototyping circuit boards from dipmicro.com and wow! Awesome! (So you know, I am in no way affiliated with dipmicro, I was just really impressed) Yes, that's right, I'm excited about prototyping circuit boards. Let me tell you why, then let me show you my ATtiny13 ESC adapter circuit I built for Pokey my Robot Firefighter. Circuit Board Features On all the other prototype bo ...

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Raspberry Pi GPIO Header – protection

The mouse is here. Gave up on looking on the web for programming help and ordered a book on the Raspberry Pi. While waiting for this to come thought I'd look at the GPIO bus. The GPIO bus allows the Raspberry Pi to control external electronics and handle various inputs. As well as 17 Input and Output pins, it also provides a 3.3V and 5V supply. Looking on the web, found this site which has a lot of useful i ...

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150W Boost Converter Schematic

In a recent project, I needed a boost converter to step up 5V to about 8V at a few amps. A few different Chinese-made boost converter modules are available from various sources: I’ve seen them on eBay and Amazon. One very common one is known as the ‘150W Boost Converter’. I believe it’s intended for charging laptops from car batteries. It’s specified to take an input of 10-32V and output 12-35V, which isn’t ...

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Shade Technologies – Prototype I Final Report: Motorized Wheelchair Canopy

Introduction Our Motorized Wheelchair Canopy intends to help those people with disabilities that confine them to their motorized wheelchairs and need shelter at times of inclement weather, such as rain or extreme heat. Although manual wheelchair canopies do exist, no type of motorized wheelchair canopy currently exists in today’s market for purchase. People with disabilities that confine them to their motor ...

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Raspberry PI weather station – Section two – GPIO

This is the second section of the raspberry pi weather station project. How to set up the Raspbian operating system and proxy settings are included in the section one. The main concern in section two is to give an idea about the General Purpose Input / Output ports (GPIO) in Raspberry pi. This section consists of – How to interface an LED How to interface a push button How to interface a temperature sensor ...

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Rice as a cheap common moisture absorber

Research shows rice is the answer for a wet mobile as cheap soaking agent for moisture When you accidentally drop your mobile into water, what do you do?  Huddersfield scientists now have the answer. Science student Claire Boakes is pictured with her fascinating research into how rice flakes, among other things, can help revive seemingly broken mobile phones after they have been submerged in liquid. THOUSAN ...

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Create a TimeMachine Backup Storage on the Raspberry Pi

TimeMachine is the way to backup your data on Mac systems. The backup and restore procedure work nicely out of the box with very little hassle involved. I used to backup my data on a local USB disk for some years. However, backups to a USB disk require you to connect the disk, otherwise no backups will be performed. Apple will sell you the Airport Time Capsulate, which allows for remote backups. But it is a ...

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