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Hacking a Cheap Ammeter / Voltmeter to Provide a Bluetooth PC Interface
I love analyzing data, so any time I see a cool device to measure something I usually want to save its output. I’ve lately come to enjoy the cheap panel-mount volt meters and current meters on eBay,...
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Generating Analog Voltage with Raspberry Pi
I recently had the need to generate analog voltages from the Raspberry PI, which has rich GPIO digital outputs but no analog outputs. I looked into the RPi.GPIO project which can create PWM (which I...
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Raspberry Pi RF Frequency Counter
I build a lot of RF circuits, and often it’s convenient to measure and log frequency with a computer. Previously I’ve built standalone frequency counters, frequency counters with a PC interface, and...
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1 Rotary Encoder, 3 Pins, 6 Inputs
Rotary encoders are a convenient way to add complex input functionality to small hardware projects with a single component. Rotary encoders (sometimes called shaft encoders, or rotary shaft encoders)...
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Logging I2C Data with Bus Pirate and Python
I’m working on a project which requires I measure temperature via a computer, and I accomplished this with minimal complexity using a BusPirate and LM75A I2C temperature sensor. I already had some...
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Precision Pressure Meter Project
I just completed building a device capable of measuring temperature to one hundredth of a degree Celsius and pressure to one ten-thousandth of a PSI! This project is centered around an ICstation MS5611...
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Controlling Speakers with RADAR
I just finished building a device that uses RADAR to toggle power to my speakers when it detects my hand waiving near them! I have some crummy old monitor speakers screwed to a shelf, and although...
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TTL Triggered Stimulus Generator
I was presented with a need to rapidly develop a pulse generator to take a TTL input and output a programmable output (for now 0.1 ms pulses at 20 Hz for as long as the input is high). I achieved this...
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Action Potential Generator Circuit
Few biological cells are as interesting to the electrical engineer as the neuron. Neurons are essentially capacitors (with a dielectric cell membrane separating conductive fluid on each side) with...
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Microcontroller Action Potential Generator
Here I demonstrate how to use a single microcontroller pin to generate action-potential-like waveforms. The output is similar my fully analog action potential generator circuit, but the waveform here...
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PS4 Controller Hack – Adding Auto-Run
After a long day it can be really nice to have a relaxing hobby to clear your head, and few activities shut down your brain as effectively as video games. However, a newly released video game is...
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Hurricane Hack – DIY LED Candle
Florida is about to get hit by a massive hurricane, and my home town is in the direct path! I am well prepared with lots of food, water, and communications equipment. While the storm itself is...
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IoT Festivus Pole
The Internet of Things now includes Festivus poles! Festivus is a holiday celebrated on December 23rd, and its customary practices include a Festivus pole, Festivus dinner, airing of grievances, feats...
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Bit-Bang FTDI USB-to-Serial Converters to Drive SPI Devices
The FT232 USB-to-serial converter is one of the most commonly-used methods of adding USB functionality to small projects, but recently I found that these chips are capable of sending more than just...
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Sound Card ECG with AD8232
Every few years I revisit the idea of building an ECG machine. This time I was very impressed with how easy it is to achieve using the AD8232, a single-lead ECG front-end on a chip. The AD8232 is small...
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Logging I2C Data with Bus Pirate and Python
I’m working on a project which requires I measure temperature via a computer, and I accomplished this with minimal complexity using a BusPirate and LM75A I2C temperature sensor. I already had some...
View ArticleClik here to view.
Precision Pressure Meter Project
I just completed building a device capable of measuring temperature to one hundredth of a degree Celsius and pressure to one ten-thousandth of a PSI! This project is centered around an ICstation MS5611...
View ArticleClik here to view.
Controlling Speakers with RADAR
I just finished building a device that uses RADAR to toggle power to my speakers when it detects my hand waiving near them! I have some crummy old monitor speakers screwed to a shelf, and although...
View ArticleClik here to view.
TTL Triggered Stimulus Generator
I was presented with a need to rapidly develop a pulse generator to take a TTL input and output a programmable output (for now 0.1 ms pulses at 20 Hz for as long as the input is high). I achieved this...
View ArticleClik here to view.
Action Potential Generator Circuit
Few biological cells are as interesting to the electrical engineer as the neuron. Neurons are essentially capacitors (with a dielectric cell membrane separating conductive fluid on each side) with...
View Article