This article describes the The Handy Board - The Cricket Robotics Controller (BF245). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components: BF245.

The Handy Board - The Cricket - Robotics Controller

The Handy Board is a 6811-based microcontroller system that lets you build mobile robots for educational, hobbyist, and industrial purposes. People use the Handy Board to run robot design courses and competitions at the university and high school level, build robots for fun, and control industrial devices. This site is the home page and resource center for users of the Handy Board.

The Cricket is a tiny robotics controlleris much smaller than the Handy Board, weighing only a few ounces.

can control two motors and can accept two sensors, plus it has an expansion port for additional devices.
has a built-in infra-red port, so Crickets can communicate with each other.
is powered by four AA batteries.
is programmed using "Cricket Logo," a version of the powerful, yet easy-to-learn Logo language.

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This article describes the Temperature Sensor Project - Quozl (DS1820). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components: DS1820.

Features

prototype from kitsrus

provides real-time data to your computer via serial port,
interfaces up to four DS1820 temperature sensors,
absolute accuracy near 0.5 degrees celcius (as per DS1820 specifications),
relative accuracy near 0.01 degrees celcius,
speaks in Centigrade or Fahrenheit (selectable by header pins),
powered by your computer's serial port, no extra supply to organise,
data format easily processed, no special programs required,
minimal parts count reduces cost,
built-in serial number for circuit identification,
special versions available for exotic requirements; high speed, low speed, additional sensors, long distance or pedantic serial bus.
spare inputs can be used as single-bit digital inputs, (feature removed from final version but can be re-inserted)


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This article introduces a simple infrared remote control circuit tester. The principle of the circuit is easy to understand, also very practical. The depth of understanding of the circuit components are related to your understanding of the circuit, such as you can see and buy these components: SFH2030 .
I use a photodiode, SFH2030 as infrared sensor. A MOSFET opamp CA3140 used to amplify pulse current differential mode from the photodiode. Is a common color leds LED1 will light when the infrared radiation is received. The output of the opamp, pin 6 May be connected to a dc voltage setting multimeter reading. Advantages of infrared remote control can be compared by the meter reading, higher reading infrared light. I in view of the different remote control sensor from 1 meter far, compare the results. For each microamps of current through the photoelectric diode, the generation of about 1 v is output. A 741 or LF351 won't work in this circuit. ? Although I use a 12 v power supply, a 9 volt battery will also work here.
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This article introduces the voltage monitoring circuit diagram. The principle of the circuit and easy to understand, is also very practical. The depth of understanding of the circuit components are related to your understanding of the circuit, such as you can see and buy these components: UA741 .
When the input voltage is 0 LED. LED to stop when the voltage rise to light level will depend on the R2. Reverse and - needle reverse operation mode. Set the voltage at the cause, (1) set to 0 v in the input. (2) set the input voltage in the ideal level. (3) the adjusted R2 to point out after correct leadership.
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Technical measures to enhance the reliability of PCB equipment: scheme choice, circuit design, PCB design, structural design, component selection, production process and other aspects, specific measures are as follows:
(1) to simplify the design.
Design, in ensuring that equipment meet the technical, under the premise of performance indicators, should try to simplify the design, simplify the circuit and structure design, make each parts are the minimalist design. The world's popular modular design method is an effective measure to improve equipment reliability. Block function relatively single, the system is composed of modules, can reduce the complexity of the design, the design standardization and normalization. A large number of facts have proved that both at home and abroad, product design and modular design method should be adopted.
(2) using the module and standard parts.
Modules and standard parts is proved after a large number of trials and widely used for high reliability products, thus can fully eliminate disadvantages of equipment and the hidden danger, also brought problems after the replacement and repair of convenience. Using module and standardized products can not only effectively improve the reliability of equipment, and can greatly shorten the development period, rapid modification for equipment and column packed with extremely favorable conditions.
(3) improve the level of integration.
With strong functions, high level of integration of large, very large scale integrated circuit, try to reduce the number of components. The less components, produce less hidden danger point also. In this way, can not only improve the reliability of equipment, but. Can shorten the development, the development cycle.
(4) the derating design.
Derating design refers to the components under the condition of lower than the nominal stress work, is one of the effective methods to reduce the failure rate of components, therefore, is designed on the premise of ensure the technical performance indicators, when the working voltage range, the temperature characteristics of components, the electric characteristic parameters such as adopt derating use method, so as to reduce the failure rate of components in a variety of stress conditions.
Derating design, different components of the factors to be considered is not the same, have a plenty of voltage range, have a plenty of current size, have a plenty of temperature, have a plenty of frequency, have a plenty of vibration and so on. In general, high voltage, frequency and temperature characteristics of capacitance and resistance of power, current and frequency characteristic of inductance, diode, triode, SCR, operational amplifier, drives, gate junction current and junction temperature of the device or the fan out coefficient, the switch of power supply and main power source voltage/current resistance and heat resistance properties of cable, signal cable frequency characteristic, and the radiator, connectors, modules, power supply such as the use of the requirements for derating design.
Choose the high quality device (5).
Components is a basic component unit of equipment, its quality will directly affect the reliability of the equipment. Military communication equipment should be above industrial products, the best is the military, and strict in front of the computer screens, aging out early failure device.
(6) make full use of the software resources.
Due to the flexibility of software programming, software in the design should make full use of resources. The software debugging methods and tools are relatively more, easy to locate fault and design problem, solve the cycle is relatively short. Make full use of the software resources is an important way to improve the reliability.
(7) structure is reliable, mature technology, advanced.
Circuit, the structure design, should try to reduce the number of connectors, metallized hole, circuit devices and chips as far as possible with the method of directly on the PCB welding, choose surface-mount devices, USES surface-mount technology, in order to avoid poor contact, to ensure the reliability of the equipment.
(8) thermal design.
High temperature is one of the important factors that cause equipment performance and reliability to reduce, therefore thermal protection measures should be taken to control and lower the rise of temperature of the device to work, to ensure good heat dissipation, set to improve thermal reliability of the equipment.
Low temperature, can also cause equipment performance and reliability is reduced, some components can't work normally when the environment temperature is too low. So the equipment used in low temperature environment, also must carry on the low temperature test. Must be considered in the design of the temperature of the equipment working conditions and environment.
(9) electromagnetic compatibility design.
Equipment when working by many the interference of electromagnetic field, there are others for nature. Military equipment, modern high-tech electronic fight, is a very important technological means local launch high-energy electromagnetic wave, to destroy the other components of equipment, so that the work equipment malfunction. Therefore should adopt effective anti interference measures such as shielding, filtering in order to prevent the interference of the noise and interference of electromagnetic field on the equipment, to ensure reliable operation.
(10) seismic design.
Equipment in the process of use, transport will be affected by various vibration, impact, thus affecting its reliability, therefore should improve equipment, mechanical strength and stiffness and damping buffer measures, in order to enhance the ability of equipment vibration, impact resistance and improve the reliability of equipment.
Fault indication device for the (11).
Circuit design fault detection and fault alarm device, in order to find fault in time, thus shortening the troubleshooting time of equipment.
(12) simple operation and convenient maintenance.
The function of the equipment operation, maintenance is one of the main factors to ensure equipment reliability. Design, should try to use plug-in unit, module, and USES the modular structure, standardization and rapid disassembly, to facilitate operation and maintenance. It's proved that the device adopts modular structure can greatly simplify the operation, convenient maintenance.
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1, the project name: China - Germany Beijing electrical appliances mould technology training center for PCB engraving teaching instrument and automation project of government procurement 2, the tender number: XHTC - HW - 2013-322 3, procurement person name: China - Beijing electrical appliances mould technology training center in Germany 31 - procurement people address: Beijing XiShenKu street no. 32 Contact person: liu 010-66151614 Full name: 4, procurement agency xinhua international tendering co., LTD Procurement agency address: Beijing fengtai household camp east eagle home hao yuan building, 88 a, B 29 layer Procurement agency contact: 010-52691999 5, the content of the bidding: This project bidding content for PCB carving and the automation of teaching instrument, budget amount is 890100 yuan, see chapter 6 tender documents. Chapter vi * see the tender documents requirements and technical specifications of goods. * the project does not involve the use of imported equipment. 6, the bidder's qualifications: 1) within the territory of the People's Republic of China, registered in accordance with the company law of the People's Republic of China,

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