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Questions tagged [datalogger]

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2
votes
1answer
28 views

Resetting of NodeMCU ESP8266 in deep sleep

I have been doing a project as my first project to learn ESP8266 applications. My project is a temperature and humidity values data logger and upload the data to Thingspeak. The sensor used is DHT11. ...
2
votes
1answer
181 views

How to save a bit sequence from oscilloscope?

I'm using two wires to communicate between devices. First wire is a clock, second is a data bit. Logic is simple: master device (AVR ATMega in my case) sets a value on the data pin, then raise "1" on ...
0
votes
1answer
72 views

What do I need to do to connect an ADC IC to a Adam 6066??Is it even possible to read the inputs from the ADC chip?

I am working on a input array that uses a ADC (MCP3208 or something similar) to read in several analog inputs and convert them to Digital signals that go into an ADAM 6066 Module. What would I need to ...
0
votes
1answer
159 views

FatFs strange behavior when writing to text file

I wrote a small program with PIC32MX microcontroller that sends data to a txt file in the SD card, then reads the data back from the file and finally compares the data before sending them with the ...
0
votes
1answer
63 views

hardware interfacing and data logging

I am working on a idea. The idea is to measure current from a current source, which transmits 3 levels (ex: 10 20 30mA). Which if possible should be logged, representing 3 states with 3 different ...
0
votes
1answer
63 views

way to display the data from a multi function meter [closed]

I have a multi function meter and i want to collect the data and display it. My idea was to create a api for serial communication?? will the idea work or is there any other better way?? the meter uses ...
0
votes
1answer
153 views

Ultra low power audio recorder

I'm trying to design an ultra low power audio recorder, in order to monitor ground noise in rural areas. The circuit I'm working on is based on a microcontroller (STM32L100RC) and an audio codec (...
0
votes
1answer
234 views

Why are high-sampling-rate data acquisition boards so expensive? [closed]

An example would be the NI USB-6366. My guess is that it's primarily due to the analog-to-digital converter (ADC) since it should be the component responsible for the high rate conversion, even ...
0
votes
0answers
101 views

Logging current draw over time, 100mA +

What is a good way to log(sample) current draw over a period of time, from e.g a RaspberryPi with some equipment connected to it (100 mA +). A datalogger like the EasyLog | EL-USB-4 have a ...
1
vote
2answers
741 views

How can these GPS/GPRS bike tracking locks be so power saving?

I am really puzzled by how these GPS/GPRS, solar-powered bicycle locks seem to be running on very little power. They are fitted with a tiny solar panel. As you may know, these locks are popular these ...
2
votes
3answers
110 views

1-11 Hz to DC voltage signal

I'm doing an internship where we are connecting all kind of sensors on a CAN-network for an automated datagathering. There is one sensor that sends a 50% duty cycle frequency signal between 1 and 11 ...
1
vote
1answer
121 views

Oscilloscope stop getting data

I have a Rigol DS1000Z, and I'm using it to sort of log data. I have a wavelength tunable laser that creates an electrical pulse (start of pulse is start of sweep, end of pulse is end of sweep), and ...
1
vote
2answers
201 views

Current measurement in 12V LED circuit

simulate this circuit – Schematic created using CircuitLab Just purchased an Omega data logger, i'm very concerned with the readings I am getting out of it. As a start I just want to make sure ...
0
votes
1answer
31 views

Reverse Polarity Protection for DAQ box

Firstly, I am a ME seeking advice from EE's. I have a Quadvolt voltage data acquisition box from Omega (P/N: OM-CP-QUADVOLT-30V) http://www.omega.com/pptst/OM-CP-QUADVOLT.html, that I intend on using ...
1
vote
1answer
59 views

Interpretation of ouput

I have everything in place to log my consumption of elektricity and water, but have no success to log my gas consumption. My gas meter is an old mechanical meter with rotating numeric wheels. There is ...
0
votes
2answers
220 views

Lowest possible latency, 1-way RF transmission

I am working on a wireless telemetry project with a bit of a twist. I have a CC3220 inside of a rotating shaft connected to an AMS board collecting pitch readings from a magnet mounted inside. The ...
1
vote
2answers
48 views

Low power voltage step down for datalogging

I am trying to design a datalogger that runs off battery power and am trying to maximise runtime. The logger is infrequently (every 5 minutes) logging 0-30V analog and digital signals. One of the ...
1
vote
2answers
111 views

Measuring computer power usage

I am trying to optimize the power usage of a custom application (C#) running on an embedded computer (Intel i7, Windows 7). To do so, I am measuring the current that the system requires while running ...
2
votes
4answers
120 views

Are there chips encoded with fixed 8bit values?

I am assembling a few data acquisition fixtures and would like my software to be able to identify the fixtures programatically. I have a breadboard that I can use for basic circuits. The DUT signals ...
0
votes
1answer
468 views

IEPE Circuit Model

Do anybody have a circuit model of a IEPE Loop? I am requiring to model the response of IEPE loops for checking how the frequency response of a sensor can or cannot be degraded under changes on the ...
1
vote
1answer
100 views

Will Open Collector Output of 0~12V damage 0~5V input DAQ?

In my lab configuration, I am using open-collector with 2K Ohm pull-up resistor to 12V. The data aquisition card I am using is from national instrument. If I look at the Low and High voltage of open ...
0
votes
3answers
123 views

Hacking characters in custom LCDs [closed]

Say I have a device/instrument that has custom LCD for display with mix of text and graphic/icon on the corners. I want to log the values and feed it to the computer or say automate a response when ...
-1
votes
2answers
775 views

Level shifter circuit

I found this level shifting circuit online. When I simulated this on Multisim, it works fine, but how do I find the relationship between the output and the input. Here is the circuit.
1
vote
0answers
560 views

3 Phase power logger with ADC and Raspberry Pi

I am building a 3 phase power logger with the ability to measure 3-phase AC and 2 DC inputs as well for a final year project. A typical application would be measuring a small inverter for a solar ...
-2
votes
2answers
100 views

Data logging over 5km range [closed]

I am working on a project of designing a system for leak detection in pipelines. I want to monitor pressure/flow in both endings of a 5km long pipe and acoustic emissions onto some crucial points of ...
0
votes
1answer
626 views

What is the best way to store date & time in eeprom using less bit possible?

I want to save data associated to a timestamp (like a datalogger) along a month, in a very small memory (probably only 1024bytes). I was thinking using epoch time to save timestamp but it already take ...
1
vote
0answers
870 views

STM32F401 SDIO with DMA

Please need help in: Do somebody have a a working code that writes to sd card via sdio using FatFs and DMA?( data logger) In a poling mode (without DMA) I am writing to .bin file and getting error ...
0
votes
1answer
53 views

Advice re. 4-20mA signal readouts

Apologies if this is a very low-level question, but I have no experience in this field and don't know where to start. I'm looking to borrow an accurate pressure gauge from GE: https://www....
1
vote
3answers
142 views

Data logger component identification

I'm trying to reverse engineer an aging datalogger. Before building my schematic, I would like to identify all the components. There is one component that I can't seem to identify after many hours ...
-1
votes
1answer
51 views

secured centralized logs collection through USB flash drives

I want to centralize logs collection from many different computers on which I can only plug USB flash drives. This is the only authorized device for some security reasons (even if a USB flash drive ...
0
votes
3answers
2k views

ENC28j60 ethernet interfacing with PIC18F4520 help needed

I am a newbie to ethernet controller. I need to use ethernet controller to send sensor data to our server using http get method. I went through ENC28j60 documentation and microchip's TCP/IP stack as ...
1
vote
1answer
350 views

Cancellling Out the Effect of Constant Gravitational Acceleration in a Datalogger

In a design that records not only accelerometer readings (X + Y + Z) but also gyroscopic readings (X + Y + Z) how is it possible to remove the accelerometer readings caused by gravity? I have found ...
0
votes
2answers
265 views

DMM Hack to Log Amps: [closed]

I have a spare DMM (Digital MultiMeter) that I would like to use to log the displayed data at 1 sample/sec. What would be the least expensive way to mod the DMM to log the data that appears on the ...
6
votes
1answer
424 views

GPS Power consumption MTK3339 vs SirfIII for periodic logging application

I am currently working on redesigning a SirfIII based battery operated GPS logger. A MTK3339 based GPS module has been selected due to overall (advertised) performance. The GPS logger uses a ...
0
votes
1answer
1k views

STM32F407VG-Discovery USB Limits

I'm currently in the middle of my 3rd year university project and am trying to convert the STM Discovery board into a data-logger. I've already found this site, which demo's how to make a GPS data-...
0
votes
1answer
2k views

Reading Current Transformer using Arduino

I want to be able to read current using an Arduino. I have purchased a Hobut Current Transformer from Farnell (Element14): http://uk.farnell.com/hobut/ctscmicro19-150-5-t/transformer-current-150a-1-...
4
votes
7answers
1k views

How can I collect data from a hydrophone?

I want to collect data from a hydrophone over a period of days or weeks. A desired typical collection period would be 30 days. Hydrophones are a piezo-electric transducer that output millivolts (...
0
votes
1answer
65 views

USB datalogger ground read isn't zero volts

Im using NI DAQ USB 6008 datalogger. When I connect A0 (or 1,2 etc..) to ground in single-ended mode it gives 6 mV. Shouldn't it be 0 mV? Is it corrupted or normal?
2
votes
2answers
995 views

Problems amplifying mV potential differences

I am trying to help my daughter with her science fair project of measuring efficiency of different types of household lighting in various heating conditions. Since she doesn't have the electronics ...
0
votes
1answer
1k views

Proximity detection with rfid

I am wondering if anybody has ideas for developing an (Arduino?) system that would use RFID to log occurrences when two people are in close proximity to each other (e.g., <= 1 meter). Ideally, I ...
0
votes
1answer
113 views

uC Datalogger to GUI for dataprocessing

So I looked around electronics.stackexchange for this one and here is where I landed: What type of USB Protocol for Datalogger Basically, I would like to sample a voltage (specifically, from a photo ...
0
votes
4answers
5k views

What is considered low or high frequency?

I've been reading some guides and papers on data acquisition and often times on the subject of measuring frequency they will simply say For low-frequency signals, it is sufficient to use one ...
1
vote
2answers
111 views

Best elements for downhole and high temperature circuits

I want to design a data-logger with PIC MCUs. This data-logger is going to work in chamber in the oil wells in the depth o 500 meters. and it is going to record temperature and pressure for 20 hours. ...
3
votes
1answer
876 views

How to capture values displayed on 16x2 LCD

I have an inexpensive in-line DC Wattmeter that I often use to measure yield from Solar Panels / Modules and other energy sources with reasonable accuracy and resolution. It has a 16x2 LCD display (...
5
votes
2answers
3k views

Continuously log data from an oscilloscope

I have a pin which is being toggled every 100ms by an MCU. I need to plot a graph which consists of the variation from the desired interval . That is the number of times it moved away and was toggled ...
1
vote
2answers
164 views

Is it safe to not power this USB to I2C chip when USB isn't plugged in?

I am working with someone on a data logger based on an MSP430. Since it operates on battery power, we want the device to use as little power as possible. We are planning to use this chip (FT201X) to ...
6
votes
1answer
1k views

SD card access slows down with many files

I'm working on a data logger application using a MSP430F5529 running at 2 MHz and a SD card using FatFs. The SPI interface is already running at maximum frequency. However I am seeing very erratic ...
1
vote
2answers
320 views

Collecting data from GSM devices

this is my first question on electronics, so I hope I will get it right. :) GSM and GPS are topics which are quite new to me, but I will try to be as clear as I can. Is it possible to collect data ...
2
votes
1answer
110 views

Hooking up a load cell to a temperature logger

I have an idea for little project where I want to log weight changes (standalone) on a bee hive, preferably low-cost. Now there's a lot of cheap temperature loggers on the market, for example this ...
2
votes
1answer
272 views

How do you correlate voltage output with these values that I have collected?

I'm using a "Logomatic v2 Serial SD Datalogger" to measure the voltage output of this piezo-resistive sensor, "Force Sensitive Resistor - Square." The values are logged in a .txt file in a microSD. (I ...