The Tiny Lisp Computer is a self-contained computer programmed in Lisp. Some programming examples are included in the author’s website.
This article describes a self-contained computer with its own display and keyboard, based on an ATmega328, that you can program in Lisp. You can use it to run programs that interface to components such as LEDs and push-buttons via the I/O pins, read the analogue inputs, and operate external devices via the I2C and SPI interfaces. It has a small monochrome OLED display that gives 8 lines of 21 characters per line, and a miniature PS/2 keyboard
Tiny Lisp Computer using ATmega328 – [Link]
Here is a proposal for a new OSHW logo which uses release symbols to know exactly what the license covers. The KEYS used are:
S = Schematic
P = PCB
F = Firmware and/or software
M = Mechanical CAD files
D = Design Documentation
B = Bill Of Materials
C = License used allows for commercial use
The new logo generator is on github and it is able to save the logo in .svg format. Please note this is a proposal for a new kind of open source logo and not yet used in designs.
OSHW Logo Generator – [Link]
>Designed to simplify board-level energy measurements, the LTC2947 power and energy monitor for 0V to 15V DC supply rails eliminates the need for an external sense resistor to measure current. by Graham Prophet @ edn-europe.com
Choosing a sense resistor, Linear says, is not an easy task, especially when dealing with high currents, where available sense resistors can dissipate too much power, occupy a lot of board space or have a large impact on measurement accuracy. The LTC2947 integrates a 300 µΩ temperature-compensated sense resistor to alleviate these concerns, providing users with a simple 24 mm² solution that provides up to 1.2% accurate energy readings at up to ±30A.
30A, PCB-level supply monitor has integrated 300 µΩ sense resistor – [Link]
Single Digit Big Display module using 74HC595 IC project will display large size 7 segment single digit number. 3.5inch height, which can be visible over large distance. More digit can be connected serially to each other easily connector.
This circuit is a single digit seven segment big display using a set of 5 LEDs per segment and a shift register for easy control by micro-controller input. Each of the LEDs used in this project are 5mm high glow type.
- A ULN2003 IC helps sink higher current flowing through the LEDs to ground.
- Resistor R1 to R8 are current limiting Resistors for the LEDs connected in series.
- CN1 Connector is Data In connector
- CN2 Connector is optional Data Out Connector if you need to stack more than 1 single display board in series
- +V CN1 & CN2 should be connected to higher voltage to drive the LEDs
- VCC Should be connected to 5V DC. This supply can be source from host controller
- Each Segment made up of 5LEDs
7 Segment LED Based SPI Display using 74HC595 – [Link]
The main objective of this project is to show how to interface a uCAM-II serial camera to 4Duino. uCAM-II is a highly integrated micro serial camera which could be controlled by any host that requires a video camera or a JPEG compressed still camera for embedded imaging applications. uCAM-II processes various features making it trivial to interface to a microcontroller. Following are the list of few features to help you understand the module better.
4Duino UCAM-II Demo – [Link]
Distributor Mouser Electronics has Texas Instruments’ OPT3002 light-to-digital sensor; the device promises improved system performance over standard photodiodes and photoresistors. The fully-integrated OPT3002 delivers the functionality of an optical power meter all within a single small device.
Offering a wide spectral bandwidth, flexible and automated light measuring over a 23-bit effective dynamic range, and a simplified software and set-up configuration, this low-power optical sensor is suited for use in optical spectral systems that require detection of a variety of wavelengths, such as optically-based diagnostic systems, or even as a low-power, battery-operated wake-up sensor.
OPT3002 – Light/digital IC provides optical power measurements – [Link]
In this video educ8s.tv shows us how to build an Arduino Robot that can avoid obstacles:
The robot that we are going to build today is moving around and it can detect obstacles and avoid them. It uses a supersonic distance sensor in order to measure the distance from its front side. When it detects and obstacle it stops, goes backward for a few cms, looks around and then it turns to the direction with the more space available. As you are going to find out, building this impressive little robot is extremely easy and fun. It will not take you more than a couple of hours from start to finish. Then you can use my code, modify it and implement your own robot behavior easily. It is a great learning experience and great introduction to robotics for kids and adults. Let’s build it!
A DIY obstacle avoiding robot using an SG90 servo and Ultrasonic Sensor – [Link]
Maxim’s cell-string optimizers are highly integrated DC-DC converters that replace the bypass diode and perform maximum power point tracking (MPPT) deep inside the PV module. By replacing each diode with a MPPT device, the on-off response to performance mismatch is eliminated; every cell-string contributes maximum power without interfering with the power production capability of others. This enhanced degree of flexibility leads to increased energy production; eliminating collateral performance loss due to module mismatch, degradation, soiling, localized shading, and row shading loss mechanisms.
PV cell string optimizer boosts solar panel output up to 30% – [Link]
LTC7851 – Quad Output, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing
The LTC7851 is a quad output multiphase synchronous step-down DC/DC controller with accurate current sharing between phases and differential output voltage sensing. This controller works in conjunction with external power train devices such as DrMOS and power blocks as well as discrete N-channel MOSFETs and associated gate drivers, enabling flexible design configurations. Up to 8 phases with two ICs can be paralleled and can be clocked out-of-phase to minimize input and output filtering for very high current requirements up to 260A. It operates with a VCC supply voltage from 3V to 5.5V, is designed for step-down conversion from an input voltage from 3V to 27V and produces one to four independent output voltages ranging from 0.6V to 5V. The device’s voltage mode control architecture allows for a selectable fixed operating frequency from 250kHz to 2.25MHz or it can be synchronized to an external clock over the same range. Applications include power distribution and industrial systems, FPGA, DSP, processor and ASIC supplies.
LTC7851 – Quad Output, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing – [Link]