Isolated Raspberry Pi Data Logger & DAQ Platform

Main Operating Screen

After the device is powered on, the main operating screen will appear after a short startup period.

The display is touch-enabled, allowing users to operate the device directly using their fingers. Alternatively, if a mouse is connected, all on-screen elements can also be selected and controlled using the mouse.

1. Voltage –Time Chart

The voltage–time chart on the main operating screen provides a real-time graphical representation of the measured voltage signals. The horizontal axis represents time, while the vertical axis displays the voltage level for each active channel.

Each differential voltage channel is plotted simultaneously using a distinct color, allowing clear visualization and comparison of signal behavior over time. This chart enables users to quickly monitor trends, detect fluctuations, and identify abnormal conditions or transient events during operation.

The chart is continuously updated based on the selected logging and sampling settings, providing immediate visual feedback of system performance and measurement stability.

2. Battery Status Indicator

The battery status indicator shows the current battery charge level. When the power adapter is connected, a yellow indicator appears on the battery display.

3. Date & Time Display

This display shows the current system date and time, which are used for time-stamping logged data and recorded events.

4. Volt/Temp Button

By default, the main screen shows voltage measurements. Pressing the Volt/Temp button toggles the display between the voltage view and the temperature & humidity view.

Color Button

The Color column shows the current chart color for each channel. 

Selecting a row opens the color selection screen, where a new color can be assigned to the channel.

Error Indicators

The ERROR column shows the error status for each channel. When an error occurs, the indicator activates and can be cleared by selecting it. Errors remain stored in memory until manually cleared, even after power-off.

Logger Buttons

This control allows the user to turn data logging on or off for each individual channel.

Channel Buttons

This control allows the user to enable or disable the chart display for each individual channel.

Setting Buttons

Clicking the buttons in this column allows access to the configuration settings for each individual channel.

When the channel settings button is selected, the window shown below will open, allowing each channel to be configured individually and separately from the others.

Plot

This section allows you to adjust the chart display characteristics for each individual channel.

Width

Used to adjust the line thickness of the plotted chart.

Style

Used to select the display style of the plotted line on the chart.

NoPen: Enables point-only display mode. After selecting NoPen, set Point On/Off to True to make the points visible.

SolidLine: Displays the plotted line in a continuous solid style. (—)

DashLine: Displays the plotted line in a dashed style. (---)

DotLine: Displays the plotted line in a dotted style. (...)

DashDotLine: Displays the plotted line in a dash-dot pattern. (-.-.-)

DashDotDotLine: Displays the plotted line in a dash-dot-dot pattern. (-..-)

Point On/Off

When this option is set to True, the intersection point of each X and Y data sample will be displayed as dots on the chart. Set to False to hide the points.

USL(V) / (C)

Enter the upper threshold value for the error-detection system. The value is specified in volts (V) for voltage channels and in degrees Celsius (°C) for temperature measurements.

LSL(V) / (C)

Enter the lower threshold value for the error-detection system. The value is specified in volts (V) for voltage channels and in degrees Celsius (°C) for temperature measurements.

DeltaT(ms)

Specifies the sampling interval (time per data point) on the chart in milliseconds.

Chart

Here you can configure the X- and Y-axis settings of the chart for each channel.

Xmin

Minimum value of the X-axis.

Xmax

Maximum value of the X-axis.

XTickCount

Number of divisions (tick intervals) between Xmin and Xmax.

Ymin

Minimum value of the Y-axis.

Ymax

Maximum value of the Y-axis.
Shown according to the device’s internal clock.

YTickCount

Number of divisions (tick intervals) between Ymin and Ymax.

Screen

Timeout(s)

Defines the duration (in seconds) that the display remains active when the device is operating on battery power. When an external power adapter is connected, the display remains continuously on and the timeout function is disabled.

Keyboard

Used for manually entering numerical values via the pop-up keypad. After entering a value for a selected parameter, press the OK button to confirm and store the value in memory.

Sync (Index / Time) 

Sync

When Sync is enabled, the values of Xmin, Xmax, XTickCount, and DeltaT are unified across all series. In this mode, changing any of these parameters in the selected series menu will automatically apply the same settings to all other series.

When Sync is disabled, each series operates independently, and changes made to one series do not affect the others.

When Sync is enabled, the X-axis can be configured in either Index or Time mode, allowing the X-axis to be displayed as a numerical index or as a time-based axis, respectively.

Index / Time

Selecting Index displays the X-axis as a numerical index. Selecting Time displays the X-axis as a time-based scale synchronized with the system time, allowing data to be shown according to the device’s internal clock.

Logger

Logger Address

Displays the file path where the logger stores the recorded data.

Address

Used to change or select a storage directory for data logging.

Load File

Opens the storage folder associated with the selected channel’s logger. Depending on the amount of stored data, opening the folder may take a few moments. Please wait while the system loads the directory contents.

Log Sample/ms

Defines the data logging interval in milliseconds.

ERR Sample/ms

Defines the error logging interval in milliseconds.

*Fast Error Logger System*:

The Fast Error Logger system allows transient faults to be detected and recorded even when they occur between regular logging intervals. By setting the error logging rate to a smaller value than the main logging interval, the device becomes capable of capturing short-duration anomalies that would otherwise be missed.

Log Size

Specifies the maximum number of recorded data points per file. To maintain smooth system performance, it is recommended not to exceed 5,000 data points per file. New log files are automatically named using the recording start date and time.

Free Space(MB)

Shows the remaining free space of the internal or external storage device according to the selected log file directory.

Shut Down

When this button is pressed, the system initiates a safe software shutdown to properly close all active processes and protect stored data. After the shutdown process is complete and the screen turns off, the user must switch the main ON/OFF power button to the OFF position to fully power down the device.

Time Date

This section allows configuration of the system date and time. To set the correct values, open the Localisation menu, select the country using Set Locale, and then choose the timezone through Set Timezone (Area and Location).

PCB Module (PCB-VD104-TH01)

Designed for Raspberry Pi users, developers, and system integrators who want to build the logger into their own enclosure, test fixture, or embedded system.

>span class="a_GcMg font-feature-liga-off font-feature-clig-off font-feature-calt-off text-decoration-none text-strikethrough-none">For applications that require uninterrupted operation, users may add a compatible UPS HAT to their Raspberry Pi setup. The UPS HAT is not included with the PCB Module, but it can be integrated to support backup power, safe shutdown, and power-loss event recording.

PCB Module Specifications

Measurement & Logging

Analog Inputs

4 differential voltage input channels

Voltage measurement range: ±0.006 V to ±12 V

12-bit differential analog inputs

Sampling rate: up to 30 kS/s per channel

Adjustable logging interval: 50 ms to 1 min

1 MΩ isolated input architecture to reduce channel-to-channel interference

Digital I/O

Digital inputs: 4

Digital outputs: 4

Logic levels: 12 V or 24 V

Output current: 50 mA per channel

Monitoring & Logging Features

Integrated temperature & humidity sensor

Independent data and error logging

Alarm history for event tracking and diagnostics

Complete Enclosed Logger (NLDL-VD104-TH01)

A ready-to-use instrument including the logger PCB, Raspberry Pi, 7-inch touchscreen display, UPS HAT, and durable metal enclosure. The built-in UPS HAT supports two 3,500 mAh 18650 lithium batteries for backup power. Batteries are not included to simplify shipping and avoid lithium battery transport restrictions, allowing users to source and install compatible cells locally.

Complete Enclosed Logger Specifications

Measurement & Logging

Analog Inputs

4 differential voltage input channels

Voltage measurement range: ±0.006 V to ±12 V

12-bit differential analog inputs

Sampling rate: up to 30 kS/s per channel

Adjustable logging interval: 50 ms to 1 min

1 MΩ isolated input architecture to reduce channel-to-channel interference

Digital I/O

Digital inputs: 4

Digital outputs: 4

Logic levels: 12 V or 24 V

Output current: 50 mA per channel

Monitoring & Logging Features

Integrated temperature & humidity sensor

Independent data and error logging

Alarm history for event tracking and diagnostics

Connectivity & Interfaces

• LAN and Wi-Fi connectivity
• VNC remote screen access
• 2 × USB 2.0 ports
• 2 × USB 3.0 ports
• Dual Micro HDMI outputs

Temperature & Humidity

• Temperature accuracy: ±0.54 °F / ±0.3 °C
• Temperature measurement range: –40 °F to +257 °F / –40 °C to +125 °C
• Humidity operating range: 0 to 100 %RH
• Humidity accuracy: ±3 %RH

For applications requiring higher temperature measurement accuracy, the NLDL-VD104-TH01E model will be available as an option after the campaign ends. This version includes an external temperature probe mounted away from the device housing to minimize the influence of internal heat.

Storage & Data Security

• Internal storage options: 64 GB, 128 GB, 256 GB
• External storage support: USB flash drives and external SSDs up to 2 TB

Automatic storage failover: uninterrupted logging during external storage removal, with automatic switching to internal memory if external storage is removed or unavailable

Power System

Integrated UPS HAT

Supports two 3,500 mAh 18650 lithium batteries 

Up to 3 hours of continuous operation, depending on battery quality, system configuration, and connected peripherals

Automatic transition between external power and battery operation

Mechanical Specifications

Durable aluminum enclosure

Dimensions: 8.15 × 4.92 × 2.28 in / 207 × 125 × 58 mm