XS Boost, A Chef's Salad Solar Robot Like most robot builders, I tend to accumulate interesting parts and experimental concepts that never end up being necessary in an ordinary robot design. So, every once in a while, I build a robot without a purpose just to try out a bunch of new pieces and reduce the pile. XS Boost is a chef’s salad robot -- a hearty combination of things that were lying around. Left: XS Boost compared to an ordinary soft drink can. The robot is actually more difficult to photograph than it might seem. Vital Statistics Base Dimensions: 9 cm width x 9 cm length x 7 cm height (excluding sensors and solar cell) Total Mass: 181 grams Power Source (solar): 5.5 V (open circuit) 30 mA (short circuit) 37 mm x 66 mm solar panel Power Source (battery): 2 x 1.2 V N-cell NiMH rechargeable Speed (solar): 1.5 cm/s (swapped gears, in summer, sunny), 0.24 cm/s (as pictured, in sunny winter) Speed (battery): 6.30 cm/s Left: XS Boost overhead / head on. Solar Cell Sensors Part: Siemens BPW-34 1/8in. square solar cell. Movies
12/24V 10/15/20A DC Switch Switching Power Supply for LED Strip light 180V-240V Versand nach: Weltweit Ausgeschlossen: Neuseeland, Fidschi, Papua-Neuguinea, Guadeloupe, Marshallinseln, Wallis und Futuna, Gambia, Malaysia, Mayotte, Taiwan, Polen, Suriname, Oman, Kenia, Vereinigte Arabische Emirate, Argentinien, Naher Osten, Guinea-Bissau, Togo, Senegal, Armenien, Bhutan, Usbekistan, Irland, Katar, Falklandinseln (Malwinen), Niederlande, Burundi, Slowakei, Irak, Äquatorialguinea, Slowenien, Thailand, Nordamerika, Aruba, Amerikanisch-Samoa, Schweden, Island, Mazedonien, Liechtenstein, Israel, Kuwait, Belgien, Algerien, Benin, Russische Föderation, Ozeanien, Antigua und Barbuda, Italien, Swasiland, Pakistan, Tansania, Ukraine, Singapur, Panama, Burkina Faso, Jersey, Kirgisistan, Schweiz, Réunion, Dschibuti, Chile, Puerto Rico, China, Mali, Kroatien, Botsuana, Kambodscha, Portugal, Indonesien, Malta, Tadschikistan, Vietnam, Paraguay, Kaiman-Inseln, St.
Power Smart Heads - BEAM Robotics Wiki From BEAM Robotics Wiki The power smart family of head designs spring from a simple battery-powered design by Wilf Rigter. Unlike simple bicore heads, Power Smart Heads turn off their motors when they are centered on the light source they are tracking. Consequently, they do not waste the energy that bicore heads do as a result of the fact that bicore heads oscillate when they are centered on the light source. Hence power smart heads operate more efficiently than bicore heads.  Original Version Wilf's original Power Smart Head article BEAM Heads 101 contains a complete explanation of his original design, but he recently posted this explanation of its workings: The PD1 / PD2 photobridge acts as a voltage divider with the midpoint at Vcc / 2 when the light on each PD is equal. The hi / lo oscillator uses R1 / C1 to set the basic frequency. With an R1 to R3 = 10 to 1 ratio, the frequency and the duty cycle varies when the PD output voltage is within 10% (+ / -) of the threshold.
12V 30A 360W Switch Power Supply Driver For LED Strip Light Display 220/110V #14 Versand nach: Weltweit Ausgeschlossen: Mittelamerika und Karibik, Afghanistan, Armenien, Bangladesch, Bhutan, China, Georgien, Indien, Malediven, Mongolei, Nepal, Amerikanisch-Samoa, Cookinseln, Fidschi, Französisch-Polynesien, Kiribati, Marshallinseln, Mikronesien, Nauru, Neukaledonien, Niue, Palau, Papua-Neuguinea, Salomonen, Tonga, Tuvalu, Vanuatu, Wallis und Futuna, Zypern, Algerien, Angola, Benin, Botsuana, Burkina Faso, Burundi, Kamerun, Kap Verde, Zentralafrikanische Republik, Tschad, Komoren, Kongo, Demokratische Republik, Kongo, Republik, Elfenbeinküste (Côte d'Ivoire), Dschibuti, Ägypten, Äquatorialguinea, Eritrea, Äthiopien, Gabun, Gambia, Ghana, Guinea, Guinea-Bissau, Kenia, Lesotho, Liberia, Libyen, Madagaskar, Malawi, Mali, Mauretanien, Mauritius, Mayotte, Marokko, Mosambik, Namibia, Niger, Nigeria, Réunion, Ruanda, St.
Miller Solar Engine - BEAM Robotics Wiki From BEAM Robotics Wiki Probably the smallest incarnation of the Miller SE, using SMD pieces On December 18, 1999, Dave Hrynkiw announced on the BEAM Email List that Solarbotics had licensed the Miller Solar Engine from Andrew Miller of "AM Innovations".  Introduction The Miller solar engine (also called Millerengine) uses a 1381* voltage detector (a.k.a., a voltage supervisor) IC to drive a voltage-based (type 1 solar engine) solar engine. The Miller SE is designed to increase the 1381 hysteresis to a larger value. Here's the basic circuit (It is shown as a modification to the "vanilla" 1381 SE circuit, where added components are red, deleted components are grayed out, and common components are in black):  How it works As the solar cell charges the (4700 uF) storage capacitor, the voltage across the capacitor increases with time. By choosing values for C1 and R1, we can "tweak" the performance of this circuit.  Freeforming  Calculating the 1381 Voltage
SPX1117M3-L-3-3 | SPX1117 Series 3.3 V 800 mA Low Dropout Positive Voltage Regulator - SOT-223-3 | EXAR The SPX1117 is a low power positive-voltage regulator designed to satisfy moderate power requirements with a cost effective, small footprint solution. This device is an excellent choice for use in battery-powered applications and portable computers. The SPX1117 features very low quiescent current and a low dropout voltage of 1.1V at a full load. As output current decreases, quiescent current flows into the load, increasing efficiency. SPX1117 is available in adjustable or fixed 1.5V, 1.8V, 2.5V,2.5V, 2.85V, 3.0V, 3.3V and 5V output voltages. The SPX1117 is offered in several 3-pin surface mount packages: SOT-223, TO-252, TO-220 and TO-263.
Solar Charger 200ds230 rev2 Note, a newer version can be found here. An unconventional, scalable high efficiency 12V solar power system and battery charge controller with low voltage cutout to protect the battery. (ideal for systems of 50W or less) Low idling currentThis circuit was designed for small to medium lead acid systems and feature a lowish idle current ( 5mA ) which increases battery life on small capacity systems. Easily obtainable partsAll the parts in this design are through hole parts and can be found from a number of sources. Late generationThis is the 3rd iteration of the design, with improvements and bug fixes at every step. Some of the older, development revisions : Regulation The solar controller uses shunt solar regulation, when battery voltage exceeds a set voltage, typically set to 13,8V. Low voltage battery protectionThe circuit disconnects the battery if the if the battery voltage drops below an adjustable point, typically 10.5V. An exampleAssuming you are paying 3$ / Watt for your panel.
SP34063AEN-L/TR | SP34063 Series 1.5 A Buck Boost Inverting DC-DC Switching Regulator - NSOIC-8 | EXAR Exar offers a broad array of power management integrated circuits (ICs) that are used in a wide variety of end applications. Exar’s state of the art solutions provide high efficiency, low quiescent current, small size and the industry’s best price/performance ratio. Many of Exar’s most advanced power management ICs are offered in thermally enhanced, lead-free DFN or QFN packages for the best blend of low thermal impedance and minimal circuit board area. Exar power management products can be used as stand alone solutions but are designed to be used together to create a complete power management system. The SP34063A is a monolithic switching regulator control circuit containing the primary functions required for DC-DC converters. This device consists of an internal temperature compensated reference, voltage comparator, controlled duty cycle oscillator with active current limit circuit, driver and high current output switch. Features
Faraday For Fun: An Electronic Batteryless Dice There has been a lot of interest in muscle powered electronic devices, due in large part to the success of Perpetual TorchPerpetual Torch, also known as battery-less LED torch. The battery-less torch consists of a voltage generator to power the LEDs, an electronic circuit to condition and store the voltage produced by the voltage generator and high efficiency white LEDs. The muscle powered voltage generator is based on Faraday's law, consisting of a tube with cylindrical magnets. This Instructable shows you how to build an electronic, batterless dice. But first some background --->
NCP5501DT33G | NCP5500 Series 3.3 V 500 mA Positive Fixed LDO Voltage Regulator - DPAK-3 | ON SEMICONDUCTOR Überblick Produktbesonderheiten Input Voltage-Max: 16 V Output Current-Max: 500 mA Output Voltage-Min: 3.3 V The NCP5501 Series low dropout (LDO) linear voltage regulator provides up to 500 mA over a user-adjustable output range of 1.25 V to 5.0 V, or at a fixed output voltage of 1.5 V, 3.3 V or 5.0 V, with typical output voltage accuracy better than 3%. NCP5500 and NCV5500 versions include an Enable/Shutdown function and are available in a DPAK 5 and SOIC 8 packages. Features: Output Current up to 500 mA 2.9% Output Voltage Accuracy Low Dropout Voltage (230 mV at 500 mA) Enable Control Pin (NCP5500 / NCV5500) Reverse Bias Protection Short Circuit Protection Thermal Shutdown Wide Operating Temperature Range NCV5500 / NCV5501; -40 °C to +125 °C Ambient Temperature NCP5500 / NCP5501; -40 °C to +85 °C Ambient Temperature NCV Prefix for Applications that Require Site and Change Control Stable with Low Cost Ceramic Capacitors These are Pb-Free Devices Applications: Zubehör (0)
Using a Small Solar Cell and a Supercapacitor in a Wireless Sensor July 1, 2010By: Pierre Mars, CAP-XX (Australia) Pty. Ltd.Sensors Here's how supercapacitors—double-layered capacitors with the ability to store far more energy that a traditional capacitor—can be used in conjunction with a small solar cell to power a wireless sensor node. Wireless sensor networks (WSNs) are becoming more common. They solve problems in many applications, some of which can harvest solar energy to use as a limitless, battery-free energy source. However, small solar cells are very low power, delivering milliwatts of energy. What Are Supercapacitors? CAP-XX supercapacitors benefit from a nanotechnology construction that packs the highest energy and power densities into thin, prismatic packages that fit space-constrained devices. Supercapacitors as a Power Buffer Before there were low-impedance supercapacitors, designers had to size the entire power supply system for the load's peak power. In our example, the average load power is 0.75 mW. Low leakage current. Aging. where:
Simple DC-DC converter with design tool The MC34063A is an easy to use DC-DC converter that can be used to step battery voltage up or down to run your processor, small servos or to make an efficient LED spotlight. The photo shows a kit I bought from Oatley Electronics using this IC and has parts for stepping up or down on the one board. In the photo I'm driving 6x0.5W 10mm LEDs from two AA batteries (3V). This kit is set up to regulate current by regulating the voltage across a shunt resistor but only minor modification is needed to use it as a 5V regulator. The Datasheet also has several sample application circuits complete with board layouts that can step up or down or even invert to supply a negative voltage rail for opamps etc. Best of all, I've found a simple design tool that displays the apropriate schematic and calculates component values for you. You will need soldering skills to assemble the kit otherwise just get the components from your local supplier and breadboard it.
Unusual Components and Applications - WorkbenchFun.com Negisters, Unijunction transistors, Precision Resistors, and Hall Effect Devices Nothing has impacted our lives more than the electronic devices we now use in our everyday lives. More and more, sophisticated devices are becoming commonplace and research is constantly adding to the list. Negistor One of the most unusual devices in electronics is the negister. In the diagram we see a capacitor across the transistor charges until the reverse breakdown voltage is reached. Amazingly, the circuit is extremely stable and produces a linear ramp wave. White Noise Generator The avalanche mode can also be useful in the production of white noise. Unijunction Transistor One of the most unusual solid state devices is the unijunction transistor. In the unijunction circuit capacitor C1 charges through resistor R1. Capacitor C2 charges through resistor R2 and is discharged at the same time as capacitor C1, producing a negative pulse. Precision Resistors Hall Effect Hall Effect Sensor Alarm Conclusion