An adjustable frequency pinger for rubber ducks.

The NEW, low cost and easy to make Mighty1284P DIP Module for breadboard prototyping. Made with all through hole components. Use the new core and exact same pinout of the original maniacbug Mighty 1284P 16MHz prototype board. Other features include the ICSP connector, resettable fuse, reset button, and D13 LED indicator.

See details at: http://www.firebirduino.com/mighty_stick/

LPF from ericarcher.net A low pass filter that runs on a 9 volt battery and sounds great!

output attenuator and external input amplifier for guitar pedal interfacing

a simple pAn miX mixer with stero aux input.

Audio/Video sync and latency testing circuit.

More details: http://source.android.com/devices/testing_circuit.html

Prototype split sheath crossed dipole

Raspberry Pi Model B interface for a home brewery

Fixes some issues w/v1 board

This PCB is designed to help owners of the Uniden BCD396XT to connect their HTs to a standard USB port without need to buy the Uniden’s official data cable.

This design was inspirated by the webpage Uniden BCD396XT non-standard “USB” cable and a source of connectors

List of Materials to assemble the PCB:
- 1x USB-A 4-Pin Female 90 Degree DIP Socket Connector;
- 1x DB9 9 Pin 2 Row 90 Degree DIP D-sub Female (or Male, depending of your USB to RS-232 cable) Plug Connector;

The spirit of http://www.harbaum.org/till/i2c_tiny_usb/index.shtml

https://github.com/acrobotic/Ai_Synth_AVR

NCE to DIN DCC cab bus fascia panel

MFSK16 APRS Tracker

Details can be found here: http://kehribar.me/hardware/electretAmplifier/

Ekho: Realistic and Repeatable Experimentation for Tiny Energy-Harvesting Sensors

Josiah Hester, Timothy Scott, Jacob Sorber
School of Computing, Clemson University

Our paper, “Ekho: Realistic and Repeatable Experimentation for Tiny Energy-Harvesting Sensors” describes the design and evaluation of a new tool for recording and replaying energy harvesting conditions. Energy harvesting is a necessity for many small, embedded sensing devices, that must operate maintenance-free for long periods of time. However, understanding how the environment changes and it’s effects on device behavior has always been a source of frustration. Ekho allows system designers working with ultra low power devices, to realistically predict how new hardware and software configurations will perform before deployment. By taking advantage of electrical characteristics all energy sources share, Ekho is able to emulate many different energy sources (e.g., Solar, RF, Thermal, and Vibrational) and takes much of the guesswork out of experimentation with tiny, energy harvesting sensing systems.

This paper received the BEST PAPER Award at the 12th ACM Conference on Embedded Networked Sensor Systems (SenSys 2014), held in Memphis, Tennessee November 3-6, 2014.

Analog-Front End PCB

This is the PCB for the analog front end. We are hosting it on OSH Park so anyone can print the board themselves.

More details on assembly, and usage can be found at josiahhester.com/ekho

Eagle files, gerbers, Bill of Materials, and Code can be found on Github.

Vector Network Analyzer Fixture

https://github.com/ko7m/VNA_Fixture