The circuit in Figure 1 efficiently monitors common digital-audio signals. One format for such signals is the Audio Engineering Society (AES) 44.1- or 48-kHz standard. Typically, the data consists of a serial data stream with a data rate of approximately 1 Mbps. A lower frequency pulse interspersed in the data stream synchronizes data frames every 16 to 20 data bits.
The hardware is shown in the picture (might take a little while to load). Don`t be the least bit concerned if you don`t understand everything in the first few paragraphs below. Their purpose is to provide a brief description of the hardware to those who understand the terminology. The terms will be second-nature by the time you finish the tutorial. Just skim the information, make a note of the ordering information and Super Start, then move on...
An ultrasonic, or sonar, range finder is a common sensor in robotic systems and industrial environments. Even home and automotive uses are possible. A novel sensor design consists of a WC, a few peripheral components, and a pair of ultrasonic transducers (Figure 1). The range-finder module consists of a WC, a transmitter, a receiver, a direct-receive inhibit circuit, and an RS-485 interface. The module`s usable range is approximately 4 in. to...
Application Note 381 contains information necessary to interface the Motorola MPC8260 processor to the DS2155 T1/E1/J1 Single Chip Transceiver (SCT). The application note covers interfacing both the address and data processor bus and the communications serial bus. Interfacing the processor bus of the MPC8260 to the DS2155 is straight forward and mapping of address and data lines is discussed in detail.
A design example for a portable data acquisition system is offered that greatly simplifies the circuit design task. A reduction from seven components down to three components is accomplished with a design that has lower system cost, faster time-to-market, smaller size, better performance, and higher reliability.
Like its predecessor, AN67, this Application
Note includes circuits for high speed video, interface
and hot swap circuits, active RC and switched capacitor
filter circuitry and a variety of data conversion and
The most important criteria of a data-acquisition system for college science laboratories are simplicity and price rather than precision or speed. The data-acquisition system in Figure 1 offers adequate precision of less than 0.5% and speed of 1 Hz to replace the outdated laboratory chart recorder in student laboratories. You can install the system in 5 sec, operate it with a single toggle switch, and construct it for approximately $40. The...
Here`s a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. It is not as sophisticated as the ones the professionals use, but it works. It works by measuring skin resistance, which goes down when you lie.
Application Note 67 is a collection of circuits from the first
five years of Linear Technology, targeting data conversion,
interface and signal processing applications. This
Application Note includes circuits such as fast video
multiplexers for high speed video, an ultraselective
bandpass filter circuit with adjustable gain and a fully differential, 8-channel, 12-bit A/D system.
The circuit diagram of the Lie Detector is shown above. It consists of three transistors (TR1 to TR3), a capacitor (C1), two lights or LEDs (L1 & L2), five resistors (R1 to R5), and a variable resistor (VR1).
This circuit is based on the fact that a person`s skin resistance changes when they sweat (sweating because they`re lying). Dry skin has a resistance of about 1 million ohms, whereas the resistance of moist skin is reduced by a...
The current concept incorporates a wireless transmitter and receiver and is thought to be used for remote controlled airplanes or appliances with two seperate parts. In other words, we have one dedicated transmitter (acquisition, filtering) and one dedicated receiver part (user-interface, look-up table, calibration, storage), capable of being connected together with any physical layer, e.g. wired, wireless, infrared. If you want to build a...
The TMP03* is a complete temperature data-acquisition system on a monolithic silicon chip. Including a silicon-based sensor, internal voltage reference, and sigma-delta A/D converter, it fits in a 3-pin (power, common, and output) TO-92 transistor package. Its digital output is a low-frequency variable-duty-cycle serial data stream, available at an open collector with 5-mA sink-current available. A companion product, the TMP04, is identical...
Sensitive systems, such as those in aircraft, must withstand fault conditions, thereby avoiding component and system damage, because a sensor failure could cause a catastrophic event to occur. A channel protector, comprising two n-channel MOSFETs connected in series with a p-channel MOSFET, can protect sensitive components from voltage transients in the signal path, whether or not the power supplies are present (Figure 1).
Using a product developed for PC-motherboard environmental monitoring, you can configure a low-cost, general-purpose DAS (data-acquisition system) (Figure 1). The DAS can directly monitor multiple voltage channels as well as temperature and frequency. It can also directly monitor digital sensors. Using only a few additional components, the system can accommodate other sensor and transducer elements. The flexibility exists to expand the scheme...
This application note features 8-, 10-, and 12-bit data
acquisition components in various circuit configurations.
The circuits include battery monitoring, temperature sensing,
isolated serial interfaces, and microprocessor and
microcontroller serial and parallel interfaces. Also included
are voltage reference circuits (Application Note 42
contains more voltage reference circuits).
Below is a rough schematic of the layout of the accelerometer PC board looking from the component side. The microcontroller is an Atmel AT89S8252, an 8051 clone. This microcontroller is in-circuit programmable using an SPI interface. The SPI pins are also used to drive the MMC. To permit the dual use there is a jumper block (located below the 74AHC244, marked "P" and "R") that allows the pins to be connected for programming (P) or running the...
This application note describes techniques of using a PC based Digital I/O Board to characterize analog-to-digital converters (ADCs). It will look at static DC parameters such as integral nonlinearity (INL), differential nonlinearity (DNL), gain, and offset errors, but also noise, internal reference voltage, and channel-to-channel coupling and matching, as well as the supply voltage dependence.
Industrial control systems continue to employ standard analog signals for transmitting data between the process and the control equipment. Robust, 4-to-20mA current-loop signals that are easily transmitted over several thousand feet, ±5 and ±10V signals are also very common in industrial systems.
This application note showcases Maxim`s integrated Data Acquisition System (DAS) solutions. Maxim`s DAS solutions save board space, power, and...
The LTC®2400 is the industrys first No Latency TM ADC
that combines automatic offset and full-scale calibration,
an internal oscillator, a sinc4 digital filter, and serial I/O to
yield a 24-bit ADC with 1.5µVRMS input noise and singleshot
conversion time architecture. It is the ideal
A/D converter for temperature measurement and high
effective resolution instrumentation applications, such as
A follow up Mk2 version described by EA`s Jim Rowe in the May/June/July 94
issues of EA improved on the original with calibrated time and vertical
scales, and extra triggering features. This design proved even more popular
than the first, proving that there is a genuine need for such a low audio
bandwidth PC based scope.
Now that we`ve covered the basics in tutorials 1-10 (you have watched them all right! ), it`s time to start pursuing some more complex projects! In this episode, we`ll utilize an SD card shield from cooking-hacks. com to create a datalogger. First, I`ll walk you through the process of reading from, and writing to an SD card. Then, we`ll utilize som
Following last year`s rediscovery of radio controlled flight, I`ve recently become enamored with the hacking/mod potential of the downright bargain priced 9-channel FlySky FS-TH9X transmitter (also sold as Turnigy/Eurgle etc). The original 2. 4GHz RF module and firmware are quite useable, already making this a fairly capable piece of kit considerin
Your task is to use the PIC to log data from an analog input on an EEPROM, and after the data collection is over, to send the data back from the EEPROM to a PC running matlab. Use an interrupt service routine to read an analog input and write the value to an external EEPROM using I2C. After reading in a fixed number of samples, perhaps 1, 000 or 10
This documentation was compiled as a result of a bee hive temperature monitoring project. Multiple DS18B20 temperature sensors were used to sense the temperature at various locations in the hive. An Arduino with a Nuelectronics sensor shield was used to log the readings to an SD card. The RTC (Real time clock) on the shield was used to add a time
Version V2. 9 supports also GPS-receiver with ANTARIS chipset and simultaneously using of internal temperature sensor of MS5534A and external DS1820 sensor. This version can use 24C256, 24C512 or 24C1024 EEPROMs and has an internal `bootloader` implemented. V2. 9h supports DS18S20 temperature sensors, 2-wire connection for the
This is the electronic schematic of the homebuilt SONAR. Only one piezoelectric transducer is used for both transmit & receive. This transducer is switched from TX to RX via the four 4016 switches. A high gain amplifier stage & rectifier translates the received echoes into voltage pulses. The timing is controlled by the PIC12C508 8-pin microcontro