eclectica has posted a circuit for a PICAXE-enabled raincounter. The device employs a 1mm/pulse rain gauge to measure rainfall. Pulses from the gauge’s internal reed switch are read by the PICAXE-08 MCU, which in turn stores the running count in … Read more
Chris from PyroElectro has written a multi-part tutorial on building motor control firmware for a microcontroller, a PIC 18F252. This tutorial is based on his earlier robot chassis, but the principles relating to the use of a motor controller IC … Read more
Kevin Mehall got his RTL-SDR dongle and wasted no time in developing a decoder using GNU Radio for the 433MHz transmissions of Oregon Scientific remote temperature sensors (v1 protocol). These devices transmit on 433.9 MHz sending data packets containing the … Read more
Tronixstuff has posted a detailed tutorial on using Arduino and TM1640 LED Display Modules. The Arduino library included allows you to display numeric and certain alphabet characters on the display using the TM1640.
Debraj has been developing a project to read the OBD information through CAN bus. His design is based on the dsPIC33FJ128MC802 (3.3V) and MCP2551. He is using a factory stock OBD cable and feeding the data into a jack on … Read more
Here’s a unique Propeller code object providing the functionality of a Solar Position Calculator & Almanac. Written in Spin by Prophead100, this object takes input including date, local/solar time, latitude, longitude and daylight savings time status, and calculates “a good … Read more
Chris from PyroElectro writes: Here’s an article that explains how to build a dual DC motor control system, combined with a wireless receiver and transmitter (XBee modules) which tell the motors at what speed they should move forward, or backward. … Read more
ihsan kehribar from the Little Wire project informs us of his recent work entitled “Printf style debugging over AVR-ISP pins.” He writes, “if you are breadboarding an AVR chip, you are already using the SPI pins for programming the device; … Read more
Joe designed a 802.15.4 network analyzer for Linux with the STM32W-RFCKIT , by reverse engineering the Windows only closed-source application note AN3406. Summary: The STM32W-RFCKIT together with application note AN3406 is a nice low cost solution for diagnosing problems on … Read more
Jean modified the Bus Pirate firmware to integrate the standalone XSVF player into it. The XSVF player is an alternate firmware for the Bus Pirate that allows it to program CPLDs and FPGAs via XSVF files. I have integrated the … Read more
Chemicaloliver has written a short post describing how to graph ez430 Chronos watch data in Processing. His post includes links to the source code, which is an extension of the earlier Processing code by Sean Brewer. Originally written in 2010, … Read more
Balint Seeber has done it again! In this video he shows how to take the RTL-SDR dongle and use it in conjunction with the open source OP25 project to successfully demodulate APCO Project 25 (P25) digital radio voice communications. P25 … Read more
Little Wire is a ATtiny-based open source AVR programer, we wrote about it previously. This project should soon be available at Seeed Studio in kit form. Here are some updates since our last post: I finished the C and C++ … Read more
PLAYterm is a site dedicated to storing, replaying, and sharing terminal logs. When replaying your session, the code is read line by line, thus providing a more intuitive way of reviewing your logs. PLAYTERM is intended to raise the skills … Read more
Franz Enzenhofer has put together this novel search-by-image page for use with Google. This is Franz’s own work and is not affiliated with or supported by Google. He’s confirmed it works on Chrome, Safari, Firefox on Mac and Firefox on … Read more
DJ Delorie was looking for an excuse to learn about Verilog and CPLDs. So he coded up this binary to 7-segment display converter. He provides links to the source code and says this project fits into the Xilinx XC9572 (the … Read more
While we await the arrival of the Ezcap dongle from DealExtreme we found this video from Balint Seeber. He’s made using this device with GNU Radio even easier by coding up a source block for use with GNU Radio Companion.
This tutorial from Parallax explains speech synthesis for the Propeller chip. The circuit is simply a speaker plugged into the audio jack on the Propeller Board of Education (though any Propeller dev board should work; the demo program assumes the … Read more
Lloyd Atkinson writes: I was recently researching the possibility of running OpenWRT on one of my Netgear Wireless access points. I came across a Netgear page that has available TAR files of source code for hundreds of their devices! So … Read more
If you want to add voice recognition to your next Arduino project, you might want to consider the EasyVR Shield by VeeaR. It’s based on the EasyVR module, and combined with supporting libraries provides up to 32 user-defined Speaker Dependent … Read more
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