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Data Acquisition / Data Logging Circuits
Data Acquisition / Logging: 
#'s -A      B - C      D - L      M - Q      R - T      U - Z

Last Updated: October 24, 2017 02:54 PM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

LAN-DAS a LAN Based Data Acquisition SystE - M -  The LAN DAS was designed to fill a very real need which I always have in the Lab, which is: "How do I quickly read some data or control some hardware when the whole system isn't available?" I solved this with the LAN DAS a LAN based data acquisition system.  The LAN DAS contains a LAN aware, 16 bit Microprocessor that is driven via ASCII commands from a Telnet or web browser application.  The unit combines 16 digital I/O ports, 12 bit, eight input A/D channels and eight D/A converter outputs __ Designed by Steve Hageman

Laser Data Links -  Quit shining laser pointers at people and use them for something useful.  __ Green Bay Professional Packet Radio

Layout Considerations for an Expandable Multichannel Simultaneous Sampling Data Acquisition System (DAS) Based on the AD7606 16-Bit, 8-Channel DAS  -  The ADC output code will be influenced by the reference voltage applied to the AD7606 device: , Absolute Accuracy When absolute accuracy of the ADC conversion result, in addition to channel-to-channel and part-to-part matching, is critical, an external tight tolerance low drift reference should be used as the system reference.  The difference in the mean output code was 1.4 codes between V1 channels on different devices.  , Channel-to-Channel Matching for 16-Channel System In high channel count systems good channel-to-channel and part-to-part performance matching will help to greatly simplify calibration routines.  There is a maximum histogram spread of 7 codes with each channel histogram centered on code 0, as shown in Figure 6.  , Figure 4 shows bottom layer decoupling___ Analog Devices from the Lab

LCD thermometer -  In this page, I introduce the LCD thermometer which is sold by "Akizuki Denshi Tsusho".  At this thermometer, the IC thermo sensor (S8100) or the diode (1S1588) is used as the thermo sensor.  When using the IC thermo sensor, the thermometry to +100C from -40C is possible.  Also, when using the diode, the measurement to +150C from -20C is possible.  Both sensors are contained in the kit.   __ Designed by Seiichi Inoue

LCD thermometer using PIC16F871 -  Build your own temperature meter for fun.  This project uses the Microchip TC77 digital temperature sensor,  a PIC16F871 microcontroller and a 7-segment 3˝ digit LCD.  You can study the source code on how to drive an LCD display.   __ Designed by Peter Jakab

Lie Detector -  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 __ Designed by Aaron Cake

Lie Detector -  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 factor of ten or more. __ Designed by  Hack Canada

Logging Photodiode JFET Amplifier with 1pA Input Bias Current -  The 1pA input bias current contributes only 0.4fA/rtHz of current noise or 0.4nV/rtHz voltage noise with a 1Mohm source impedance.  Photodiode current is converted to a voltage by the first op amp and D1 and amplified by the first, second and third logarithmic compression amplifiers.  __ Linear Technology/Analog Devices App Note, Mar 22, 2010

Low cost gyro / accelerometer combo sensor -  In building a balancing robot you need a gyroscope unit and an accelerometer unit in order to get it to balance.  But I also wanted it to be reasonably low in cost with high performance and easily interfaced to a MCU.  Some of the other solutions are prohibitively expensive, even if they may work well.  Also the solution I had in mind had to be fairly small and use up little space and use up little power too __ Designed by Earl W. Bollinger

Low Cost, 16-Bit, 250 kSPS, 8-Channel, Isolated Data Acquisition System  -  System Performance Figure 4 shows a plot of the ADC code occurrences for 10, 000 samples   (1 sec at 1 kSPS) when CH0 through CH7 are shorted to GND on the terminal block of the evaluation board.  Note that 95% of the codes fall within 4 LSBs, and the peak-to-peak spread is approximately 7 LSBs.  The sampling rate 250 kSPS is controlled by the system demonstration platform   (EVAL-SDP-CB1Z), and the digital signal processing including the signal windowing and FFT is calculated on a PC by the CN-0254 evaluation software___ Analog Devices from the Lab

Low Power, Long Range, ISM Wireless Measuring Node  -  This simplifies the software but necessitates the use of an extra diode and resistor to separate incoming and outgoing data streams___ Analog Devices from the Lab

Low-Cost Laser Data Links -  Quit shining laser pointers at people and use them for something useful.  __ Green Bay Professional Packet Radio

LTC1099 Enables PC-Based Data Acquisition Board to Operate DC-20kHz -  AN34 A complete design for a data acquisition card for the IBM PC is detailed in this application note.  Additionally, C language code is provided to allow sampling of data at speed of more than 20kHz.  The speed limitation is strictly based on the execution speed of the "C" data acquisition loop.  A "Turbo" XT (add 1/06) __ Linear Technology/Analog Devices

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