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== Digital Potentiometers == | == Digital Potentiometers == | ||
[[Digital Potentiometers|Digital Potentiometers(AD5204)]] | [[Digital Potentiometers|Digital Potentiometers(AD5204)]] | ||
− | The digital Potentiometers made by analog devices (AD5204) has 255 positions can be adjusted by the microcomputer that can receive commands from the computer. This is a great way for analog circuitry to have digital control. This is a chip with 4 digitally controlled POTs and the pots can be daisy chained to have multiple chips | + | The digital Potentiometers made by analog devices (AD5204) has 255 positions can be adjusted by the microcomputer that can receive commands from the computer. This is a great way for analog circuitry to have digital control. This is a chip with 4 digitally controlled POTs and the pots can be daisy chained to have multiple chips controled by a single SPI interface. |
− | Unlike a mechanical POT, | + | Unlike a mechanical POT, digial POTs often have the restriction that the three terminals of the POT needs to be < VCC and > GND making these devices harder to use in applications such as LCD contract adjustment where the contrast is controlled by a voltage lower then GND. |
− | + | == Voltage Regulators == | |
+ | {| | ||
+ | ! colspan="2" align="left"| Linear Regulators | ||
+ | |- | ||
+ | | align="center"|[[Image:Main-LT1528.jpg|69px|LT1528]]<br>[[LT1528]] | ||
+ | | High current, Variable Voltage Regulator | ||
+ | |- | ||
+ | | align="center"|[[Image:TPS-V-Reg.jpg|69px|TPS V-Reg]]<br>[[TPS V-Regs]] | ||
+ | | These are 3.3V and 5V LDO, Low-Noise Voltage Regulators. Very small SOT-23 SMD package. 150mA max current. Best used in battery applications. | ||
+ | |- | ||
+ | | align="center"|[[Image:Main-LM7805.jpg|69px]]<br>[[Basic Voltage Regulators]] | ||
+ | | Variable voltage regulators, set output regulators, we give you the whole breakdown. Perfect for use with an external wall-wart power supply. | ||
+ | |- | ||
+ | | align="center"| [[Image:UA723CN_Symbol.gif]]<br>[[The 723 Voltage Regulator]] | ||
+ | | Precision Voltage Regulator. Can be used as fixed or floating, variable, linear or switching. | ||
+ | '''NOTE:''' Only the DIP-14 version (image) has the Vz pin, which is used for negative regulators. The Metal Can and the Flat-Pack do not have enough pins so exclude the Vz. | ||
+ | |- | ||
+ | | | ||
+ | |- | ||
+ | ! colspan="2" align="left"| Switching Regulators | ||
+ | |- | ||
+ | | align="center"| [[Image:MCP1253-ADJ.png|69px]]<br>[[MCP1252/3]] | ||
+ | | Extremely Efficient, 120mA Flyback Switching Regulators. | ||
+ | |- | ||
+ | |} | ||
− | == | + | == Microcontrollers == |
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− | + | Microcontrollers are little computers on a single Die/Package. The computer includes a CPU core, RAM, ROM/FLASH, and peripherals including UARTS, A/D converters, SPI, and I2C. Most modern microcontrollers use FLASH ram instead of a ROM so they can be programmed over and over. Many modern microcontrollers allow self-flashing to enable bootloading or a firmware update without pulling the chip from the circuit or using a programmer/debugger. Microcontrollers tend to be more optimizated for writting in assembly then PCs, but C and less so Basic are becoming the standard programming languages. | |
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− | + | * [[Image:lpc2103.jpg|69px|LPC2103]] [http://www.k9spud.com/arm/lpc2103/ LPC2103] Low cost 70MHz ARM7TDMI-S FLASH Microcontroller from Philips. The [http://coridiumcorp.com/arm7/ "$49" "Coridium ARMmite"] does use this chip. | |
+ | * [[Atmel]] AVR 8 bit FLASH microcontrollers | ||
+ | * [[Microchip]] PIC 8 bit FLASH microcontrollers | ||
+ | * [[Microchip]] dsPIC/PIC24 16 bit FLASH microcontrollers ( [[DsPIC30F 5011 Development Board]] ) | ||
+ | * [[Microchip]] PIC32 32 bit FLASH microcontrollers | ||
+ | * Cypress PSoC 8 bit FLASH microcontrollers | ||
− | + | ''I've written a little about the various kinds of microcontrollers at [http://en.wikibooks.org/wiki/Embedded_Systems/Particular_Microprocessors Wikibooks: Embedded Systems]. --[[User:DavidCary|DavidCary]] 06:15, 10 March 2007 (PST)'' | |
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− | === | + | == Op Amps == |
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− | + | Op amps and instrumentation amps. | |
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− | + | [[op amp]]s: Very high gain differential amplifiers. Feedback through a resistor network is used to adjust final gain. Resistors and capacitors can be placed in the feedback path to create complex circuits such as filters. Used to condition signals received from sensors. | |
+ | * [[LT1168|LT1168 Programmable-Gain Precision Instrumentation Amplifier]] - Low Power, Single Resistor Gain Programmable, Precision Instrumentation Amplifier | ||
+ | * [[LT1114|LT1114 Low Power Precision OP-Amps]] are used for amplification and filtering of the signal - Dual/Quad Low Power Precision, Picoamp Input Op Amps | ||
+ | * [http://en.wikibooks.org/wiki/Electronics/Op-Amps Wikibooks:Op-Amps] has a "quick design process" using Daisy's theorem: ''"The sum of the gains = +1 in a properly-designed op amp circuit."'' | ||
+ | * [http://ciphersbyritter.com/RADELECT/PREOPAMP/OPAMPDSN.HTM "Some Op Amp Audio Design Issues"] by Terry Ritter | ||
+ | * [http://focus.ti.com/lit/an/slod006b/slod006b.pdf "Op Amps for Everyone" ] Great free book that describes a large number of Op-Amp circuits including single rail variation. A pay version is available at Amazon. I don't know what the differences are between the two versions. | ||
− | == | + | == logic gates == |
− | Logic gates are the building blocks of digital circuits. Any digital circuit including microprocessors can be built out of the NOT function plus AND or OR. | + | Logic gates are the building blocks of digital circuits. Any digital circuit including microprocessors can be built out of the NOT function plus AND or OR. |
− | Common forms found in | + | Common forms found in descrete gates: |
* NAND - NOT of an AND | * NAND - NOT of an AND | ||
* NOR - NOT of an OR | * NOR - NOT of an OR | ||
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There are hundreds of other specialized logic gates. Here we only list the ones we actually use in some Open Circuit [[Projects|Project]]: | There are hundreds of other specialized logic gates. Here we only list the ones we actually use in some Open Circuit [[Projects|Project]]: | ||
− | * 74HC595 eight bit shift register with output latch (used for | + | * 74HC595 eight bit shift register with output latch (used for POV display) |
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+ | * Low pin count( 8 - 12 ) microcontrolers are great for logic gate replacement when high speed is not required. Athough slower, slightly more expensive, and needing to be programmed they are great for prototyping due to the extra flexibility that comes from not needing to stock lots of gate variations. | ||
+ | * FPGAs are flexible ICs contain a very large number of gates( thousands to millions ) that can be arbitrarly connected together through programming in VHDL. Only available in surface mount large pin counts. It's possible to prototype processor designs with these devices. | ||
== RF ICs/Modules == | == RF ICs/Modules == | ||
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RF modules allow transmission and reception of digital signals over radio. The two most common types are AM and FM( FSK ). The three major frequency bands used by unlicensed devices are 433MHz, 900MHz, and 2.4GHz. 433MHz has very limited uses by the FCC and is mostly used by garage door openers and wireless key entry systems. Many newer devices are moving to 2.4GHz due to the greater amount of room, althrough 2.4GHz is harder to use and has less range then the same power 900MHz system. | RF modules allow transmission and reception of digital signals over radio. The two most common types are AM and FM( FSK ). The three major frequency bands used by unlicensed devices are 433MHz, 900MHz, and 2.4GHz. 433MHz has very limited uses by the FCC and is mostly used by garage door openers and wireless key entry systems. Many newer devices are moving to 2.4GHz due to the greater amount of room, althrough 2.4GHz is harder to use and has less range then the same power 900MHz system. | ||
− | A major consideration when choosing an RF IC/Module is the amount of protocol stack that the device contains. Some modules are little more then a modulator and demodulator with the | + | A major consideration when choosing an RF IC/Module is the amount of protocol stack that the device contains. Some modules are little more then a modulator and demodulator with the digial imput and output directly controlling the RF signal to serial line wire replacement modules that implement frequency hopping, pairing, error correct/detection, and retransmission of broken data. |
[http://www.linxtechnologies.com/ Linx Technologies] makes several low power RF transmitter/receiver chips. Their range is around 500' - 1000'. They are geared for one way communication only, like keyless entry systems. They also make several serial encoding chips that make the wireless communication more secure/crack proof. Their latest chip, the HS series, is based upon the SkipJack algorithm developed by the NSA. BBA broadband ampifier modules are available for boosting the signal power to 17dBm when combined with the HP-3 modules and FHSS techniques. | [http://www.linxtechnologies.com/ Linx Technologies] makes several low power RF transmitter/receiver chips. Their range is around 500' - 1000'. They are geared for one way communication only, like keyless entry systems. They also make several serial encoding chips that make the wireless communication more secure/crack proof. Their latest chip, the HS series, is based upon the SkipJack algorithm developed by the NSA. BBA broadband ampifier modules are available for boosting the signal power to 17dBm when combined with the HP-3 modules and FHSS techniques. | ||
− | + | [http://www.maxstream.net XBee/XBee Pro modules] Modules are a drop in Zigbee module. Modules have a UART style interface with an AT command set. Cheap and very popular, these modules are great for serial cable replacement or remote sensor monitoring. | |
[http://www.sparkfun.com/commerce/product_info.php?products_id=8469 Sparkfun Bluetooth Module] Dropin module with a complete Bluetooth stack. Modules also have a UART interface with a AT command set. An advantage is many laptops and cellphones have a Bluetooth transceiver builtin. | [http://www.sparkfun.com/commerce/product_info.php?products_id=8469 Sparkfun Bluetooth Module] Dropin module with a complete Bluetooth stack. Modules also have a UART interface with a AT command set. An advantage is many laptops and cellphones have a Bluetooth transceiver builtin. | ||
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[[Category:Components]] | [[Category:Components]] | ||
+ | == ADC analog to digital converter == | ||
− | + | There are a huge variety of ADCs available. | |
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+ | If you need 10 bits or less of resolution, | ||
+ | counter-intuitively, | ||
+ | it costs less to buy an ADC plus a microcontroller on one chip | ||
+ | than to buy a stand-alone ADC. | ||
− | + | * ATTINY13V -- lowest-price chip I know of with at least one 10 bit ADC | |
− | + | * ATTINY261 -- lowest $/ADC chip I know of | |
− | + | * LPC2101FBD48 -- lowest-price 32-bit microcontroller I know of with at least one internal 10 bit ADC | |
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− | + | Many people (*) do EKGs with only 10 bit converters. | |
− | * | ||
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− | + | The [[Programmable Chip EEG]] might need more bits of resolution. | |
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− | + | What low-cost ADC are available with at least 12 bits? ''(prices in quantity 1 from Newark or Digikey)'' | |
+ | * $2.50 MCP3301 has 1 ADC input (13 bits) | ||
+ | * $3.50 MCP3302 has 2 ADC input (13 bits) | ||
+ | * $3.50 MCP3204 has 4 ADC input (12 bits) | ||
+ | * $4 MCP3208 has 8 ADC input (12 bits) | ||
+ | * $7 dsPIC30F 2011 microcontroller has 8 ADC inputs (12 bits). See [[dsPIC30F 5011 Development Board]] for details. | ||
+ | * $10 18F2553 USB microcontroller has 12bit ADC( $5.11 from buy.microchip.com in single unit quantities ) | ||
+ | * $6.50 CY8C27443 Cypress PSoC microcontroller has 4 ADC inputs (14 bits) -- but what is the sampling rate? Also has 4 DAC outputs (9 bits). | ||
+ | * $56 analog devices AD7716: four independent, simultaneous 22 bit ADCs. | ||
+ | * [http://www.maxim-ic.com/appnotes.cfm/an_pk/885 the Maxim MAX1460 includes a 16-bit ADC, 12-bit DAC], a programmable gain amp (PGA), temp sensor, and 16-bit processor. (Alas, its program is in unchangeable ROM). | ||
+ | * Analog Devices AduC812: 200kHz 12-bit ADC, 12-bit DAC, and flash-based 8051 MCU core. | ||
− | '' | + | ''I am astonished to discover that (a few) microcontrollers include 12 bit or more ADCs. Are there others? --[[User:DavidCary|DavidCary]] 18:48, 28 August 2007 (PDT)'' |
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