LOpen is a PIC-based logic probe that fits inside a pen. It detects if a pin is at a logic ‘High’, logic “Low”, or at high impedance (floating).
This time it’s a Logic Pen controlled by a tiny 6-pin PIC10F202. The PCB is 5 cm by 5mm so it fits just fine inside a regular ballpoint pen and have 5 leds (1 power led and 4 controllable from the PIC), over voltage protection on the probe input, reverse polarity protection using a p-fet.
LOpen logic probe detects high, low, and floating pins - [Link]
To assist component and system-design engineers in selecting Texas Instruments (TI) standard-logic products, this application report is a synopsis of the information available from a typical TI data sheet. Information includes a brief description of terms, definitions, and testing procedures currently used for commercial and military specifications. Symbols, terms, and definitions generally are in accordance with those currently agreed upon by the JEDEC Solid State Technology Association for use in the USA and by the International Electrotechnical Commission (IEC) for international use.
Understanding and interpreting logic IC datasheets - [Link]
Researchers from Imperial College London have demonstrated that they can build logic gates out of harmless gut bacteria and DNA. These are the most advanced biological logic gates ever created by scientists. Logic gates are the fundamental building blocks in silicon circuitry on which the digital age is based. Now that it is possible to replicate these parts using bacteria and DNA, the researchers hope that their work will lead to a new generation of biological processors.
Although still a long way off, the team suggests that these biological logic gates could one day form the building blocks in microscopic biological computers. Devices may include sensors that swim inside arteries, detecting the build up of harmful plaque and rapidly delivering medications to the affected zone. Other applications may include sensors that detect and destroy cancer cells inside the body and pollution monitors that can be deployed in the environment, detecting and neutralizing dangerous toxins such as arsenic. [via]
Scientists create computing building blocks from bacteria and DNA - [Link]
A friend of mine suggested that I build something for a 74xx TTL discrete logic contest at dangerous prototypes, so I figured why not? If you like this design, make sure to leave a comment on their website for my competition entry.
The Masochist’s video card is a pure TTL discrete logic design that generates the necessary video signals for VGA. The project name came about after the hours I spent wire-wrapping the project together yielded painfully raw fingertips. So be fore-warned if you duplicate this project, don’t abuse the wire-wrap tool!
Masochist’s Video Card - [Link]
Following up the 7400 Logic Competition announcement, we are proud to announce that will be one of the sponsors of this competition. We give away:
- uOLED-32028-P1T graphics display module + P1-EB expansion module + uDrive-USB-G1 SD module + uUSB-CE5 module + 64MB microSD card + adapter
- BOOK: Programming & Customizing PICmicro Microcontrollers – Myke Predko
- BOOK: Switchmode Power Supply Handbook (McGraw-Hill) – Keith Billings
- BOOK: Practical Electronics: A Self-Teaching Guide (Wiley Self-Teaching Guides) – Ralph Morrison
- BOOK: Switching Power Supply Design – Abraham Pressman
- BOOK: PIC: Your Personal Introductory Course, Second Edition – John Morton
- BOOK: PIC in Practice – David W Smith
- BOOK: Power Supplies Switching Regulators, Inverters, and Converters – Irving Gottlieb
- BOOK: PICmicro Microcontroller Pocket Reference – Myke Predko
- BOOK: Simplified Design of Switching Power Supplies – John Lenk
Open 7400 Logic Competition – We are a sponsor! - [Link]
The Open 7400 Logic Competition brings awareness to open hardware and software, and fosters understanding of the building blocks of modern integrated circuits. What can you build with logic chips?
Open 7400 Logic Competition - [Link]
A logic analyzer is a device that lets you watch digital signals in your electronics project. You can watch them real-time or log the data for later perusal. Unlike an oscilloscope, its not good for measuring analog signals – but also unlike an oscilloscope, you can track 8 signals at time! So its a good complementary tool. This logic analyzer plugs into a computer and has easy to use, cross-platform software. This makes it small, portable and inexpensive.
If you ever have to to debug SPI, i2c, serial, CAN, 1-wire, Manchester, biphase or other digital protocols, this tool is essential!
- Speedy 24MHz
Logic samples each channel at up to 24M times per second. A large fraction of practical, real world applications run at less than 10MHz, and Logic is ideal for these.
- 8 Channels
Logic has 8 inputs — it can monitor 8 different digital signals at once. For many modern microcontroller-based designs, this is plenty.
- 10 billion samples
Logic can save as many as 10B samples, letting you capture even the most elusive events. No more dealing with frustratingly small sample buffers.
- Comes complete
Start debugging within 5 minutes of opening your new Logic; everything is included: An ultra-flexible 22AWG 64/40 wire harness, 9 high-quality micro-hook probes, a USB cable (2 meter mini-B to A), and a nice carrying case. Download the software from our site (see software)
We love well made tools. That’s why we make Logic’s case out of custom CNC machined aluminum and make sure its anodized surface is finished to perfection.
Logic’s inputs are protected against overvoltage conditions via current-limiting resistors and ultra-low-capacitance diode clamps. A resettable fuse protects the USB ground return line to augment the USB host’s existing protection.
Saleae Logic – 8-Channel USB Logic Analyzer - [Link]
octal writes: Pretty impressive video review of Logic/ Logic16 (shows the insides as well) [via]
In this episode Shahriar takes a look inside the “Logic”, “Logic16″ and USBee SX which were reviewed in the previous episode. The PCBs get a closeup inspection along with some insight into the design of these products.
Saleae Logic16 logic analyzer INSIDE and review – [Link]
This article shows how to build a simple 4 bit computer using logic gates build by discreet transistors. It goes through basic logic calculations. Simon Inns writes: [via]
If you’ve ever wondered how electronic devices like computers can count, this article gives a simple introduction to binary and logic and shows how they are tied together with electronics to make both simple and complex computers.
4-Bit Computer – [Link]