Data Logging Circuits
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For multiplying frequencies in the 1-to 150-Hz range, this circuit uses a 4046B and a 100 prescaler. The VCO output.. -
Just a handful of components builds an 8-pin microcontroller based circuit for temperature logging via a serial port; small, fast, and acceptably accurate... -
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.... -
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.... -
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....
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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....
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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,....
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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 instrumentation circuits...
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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....
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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.... -
The MiniLOGGER provides 8-channel analog input(-99mV to +999mV), 1-channel pulse input, battery backup 256kB SRAM, Real-time Clock, and RS232C. Start/Stop recording can be made by MANUAL switch or preprogrammed Start/Stop Time. The format of uploading data.... -
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....
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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.... -
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....
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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..... -
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....
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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....
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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....
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The circuit in Figure 1 shows the versatility of the LTC2418. A combination of single-ended, differential, unipolar and bipolar input sources are simultaneously applied to the LTC2418...
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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.... -
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....
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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....
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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....
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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.... -
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.... -
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.... -
Tom Au-Yeung and Wilson Tang, Maxim Integrated Products EDN You can make a wireless temps system with two ICs You can use a local temperature sensor and an ASK (amplitude-shift-keying) transmitter/receiver pair to design a simple wireless.... -
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.... -
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.... -
This circuit is a small representation of a very low cost printer sharer i made very long ago. This is as much i can remember of the basic ideas behind the product...
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
Popular Circuits
This circuits allows you to use a cheap loudspeaker as a microphone. Sound waves reaching the...
This detector is useful in sine wave squaring circuits and A/D converters. The positive input may...
Getting microprocessor designs to work is notoriously difficult when both the software and...
This switching circuit acts like a bank of interlocked mechanical switches; pushing one of the...
The above diagram shows the different links to theinputs and outputs of each...
A useful current limiting circuit (shown below), that allows me to select a maximum current...
Our DTMF decoder can be powered from a 9V battery or from your parallel printer port. It can...
A very simple music instrument/keyboard for playing music using a 555 timer chip circuit, a piece...
The circuit above makes use of the CMOS 4017 decade counter IC. Each depression of a switch steps...
Interface the ds1820 to microcontroller. As you can see the first pin is connected to GND, the...
The driver stage works in the same manner as the class A output stage described previously....
Trying to get this motor to work with a L293D Motor Drive Shield the shield is capable of...
Buffer amplifier Shown in use as a transistor emitter follower buffer amplifier for applications...