Electronic Design solutions

01305 788579

Pooles Cavern

Great research facility

Cave and environmental loggers



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After 3 months in a cave river, a bit battered but still going strong with full data logging.

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Temp-In-Time Specification

Very robust temperature logging module, can be teathered in a river or sea and left for over 3 years. 

Can be buried underground or left in freezing conditions down to -25 deg C.

It will log the temperature and time once every hour or once every 30 mins.

Almost unlimited data storage due to sizes of SD cards.

Data is stored on a removable micro SD and unloads straight into Excel speadsheet.

No extra software or cables to buy, works straight out of the box, in fact you can't even turn it off, it just keeps logging!

CO2 data logger.       £305

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4 sampling periods

1.  10 minutes

2.  30 minutes

3.  1 hour

4.  3 hours

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Easy to calibrate, see calibration document.

CO2_Logger_Calibration Method_Iss_4PCBs.pdf
Cal method sheet
Specification Issue 8.2


CO2 6% Data Logger        £355

New product

Same design as for the standard CO2 logger, but will log CO2 levels up to 6%.

Easy calibration method.

Logs atmospheric levels and temperature levels.

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    CO Data Logger.  £325

    Same basic design as for the CO2 Data Logger.

The Oxygen Sensor is based on electrochemical principles and it can measure the ambient O2 concentration accurately and conveniently.

  • Measurement Range: 0~25%Vol
  • Maximum Measurement limit: 30%Vol
  • Resolution: 0.15%Vol
  • Stability: <2% (Every month)
  • Repeatability: <2%
  • Response Time: ≤15 seconds
  • Operating Temperature: -20~50℃
  • Operating humidity: 0~99%RH (no condensation)
  • Pressure Range: standard atmospheric pressure ±10%
  • Lifetime:> 2 years (in the air)
  • The sensor is a 'plug-in' modules and easily changed.
  • Simple calibration via push button.
  • Includes Temperature and atmospheric pressure logging

Data logged on SD card is easily transported into Excel as shown opposite.
No extra software required, no extra cables!

Will log for over a year on one set of batteries, while being dripped on!


Stalactite Drip Count Loggers (From £135)

Drip-In-Time  Logger  ( £195 )

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  Stalactite drip count logger.

Counts drips for upto 3 years on one battery. 

Also logs temperature and atmospheric pressure in real time.

Minmum water drip height required: 200mm

All data stored on removable micro SD card with almost unlimited data storage. 

Upto 65k count within each sample period.

Sample period either once an hour or every 30 mins.

Small display shows current count value, temperature, atmospheric pressure and real time.

Sharp tap on lid enables display.

Data loaded straight into Excel spreadsheet, no other software required.

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Drip-In-Time Specification_Iss4
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BIG-DRIP Data Logger               £155.00

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Each module has it's own unique serial number used for the logging file name, this number is also visible through the clear base section.

A yellow LED flashes at every valid drip and a red LED flashes at every 'sample' period.

A 'test' header on the internal PCA board enables an instant 'sample' to be taken and  logging data is then stored on the SD card. This is useful as a confidence check before setting the module in its final 'drip' position.

No software to set-up, they are ready to go straight out of the box, just set the switches as required to set the sample period and away they go!

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Another batch ready to go out

Water height data logger.  (From £225)

Uses ultrasonics to determin height of water or other objects.

Will log data for over one year on one set of batteries, all data stored on removable micro SD card

Temperature and atmospheric pressure also logged in real time at sample rate.

Small display give confidence check as well as real time measurements.

Other version avaliable used to measure snow height using infrared laser methods (eye safe).

Mechanical fixing are avaliable for top or side mounting.

An IP67 quad band Auto Dialer module may also be added via a 10m cable. This will send a text message to warn that the water level has passed 2 pre-set trigger levels of water height, (any 2 heights from sensor, between 30cm and 3m)

Ten mobile phone numbers can be included and 5 different text messages sent.

An 'Alive' signal with battery status may be sent either every Wednesday at 12.00 midday or once a month on the first day of every month.

A standard USB cable and freeware software is used to load phone numbers and text.

Also a battery operated IP67 base unit is avaliable with the ability to connect upto 4 waterproof temperature sensors and a rugged water height sensor.

Includes a small display to give confidence checks or realtime values.

The base unit can also be radio linked or via Auto Dialer as above.

All data stored on removable SD card.

Base unit Specification
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Deployed with water height sensor, atmospheric pressure, air and water temperature probes.

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Water height logger connected to a quad band Auto Dialler module, via a10m lead. Both units have their own battery power and are IP67 sealed.

Currently monitoring flood water safety levels within show cave.

Prototype unit currently operating on a small river and producing great results, production units avaliable Aug 2021.

Price without Auto Dialer module £295.


(From £165)

These devices are IP67 sealed quad band auto-dialers with internal batteries.

Upto 4 seperate input trigger lines can trigger different transmission sequences.

Designed to operate for over 2 years on one set of standard AA batteries in very harsh conditions.

Low running costs using standard sim cards, (GiffGaff,about £6 per month).

Ten mobile phone numbers can be included and 5 different text messages sent.

All messages and phone numbers input via freeware software by the customer using a standard USB cable.

An 'Alive' signal with battery status may be sent either every Wednesday at 12.00 midday or once a month on the first day of every month.

Not 'pretty' looking, but designed to be in messy places!


(From £350)

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Logger Specification issue 2

Cave Airflow and direction data logger.

The system comprises of a waterproof logger unit housing the electronics and batteries together with a dual airflow sensor connected via a 5m cable.

The prototype system shown is working well in all weathers and all different wind conditions.

The airflow sensor unit has two sensors based on the 'hot wire' method, but using very fast heating eliments, the total logging time is less than 8 seconds.

The sensors are very sensitive and a attenuation level may be selected depending upon air speed being logged. This alows a large range of air speeds to be detected and logged.

The lowest attenuation setting alows very sensitive airflow to be logged, it will capture any slight movemet of air flow, it will even capture convection current movement in a closed room.

The normal attenuation setting will easily log airflow from 0.2m/s to 3m/s, (6.8).mph. It is not designed for high airfows as in weather stations.

Using two sensors and special air baffling it is possible to detect the air flow in two directions, (mainly for use in cave passage ways) .

The baseplate of the sensor is designed to mount onto standard camera tri-pod mounts, or simply placed on rock work within a cave passagway.

The case can be placed upto 5m away via the cable.

The sensor is 'handed' with LEFT and RIGHT markings that ties up with left or right data that is being logged.

New sensors are being trialed at the present time.

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Air flow data simply imported into Excel spread sheets -->


       £105 + delivery

(Big-Drip Logger not included)

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In it's protoype stage at present, but looking promising.

Laser measurements up to 100m

Heading 0-359 deg ( 6 axis compensated).

Inclinometer +/- 80 deg

999 Leg or Station positions

On site Self calibration method

Wireless battery charging via supplied USB pad

Almost unlimited data storage using removable SD micro card

Fits in palm of hand

All mag, accelerometer, heading, distance, inclinometer, leg or station setting and real time,data recorded

Vertical height of target calculated automatically

BUT, as you can see it's not waterproof yet and needs more tweeking to get the inclinometer data more accurate.

Expected avaliability in a few weeks time and costs around £250

Stand alone battery operated Auto Dialier

(From £ 195)

Operates for over 2 years on a set of standard AA batteries.

Four seperate latched inputs trigger up to 5 different stored text messages which can be sent to 10 different mobile numbers.

Weekly or monthly 'I'm Alive' message can be sent out automatically, together with a battery condition message.

Easy customer interface to change messages and phone numbers, via internal USB connector. No software to buy.

Quad band transciever.  IP67 enclosure for external use.

(Over 100 units in operation around the UK)

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Established in 2000 Goodsell systems Limited have provided numerous solutions to customers and maintain the same customers through the close customer-client relationship that has been established.

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CO2 data logger (upto 40,000ppm), also logs temperature and humidity . Will operate for over 1 year on one set of 'D' cells.

All data stored on removable micro SD card giving almost unlimited storage.

Includes display for setting to work or checking values in real time.

Ability to 'Force' a sample at any time or syncronise to an external sampling system.

Enclosure not pretty, but it does it's job well.


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TINY-DRIP  Logger    (£135.00)

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 Very small but packed with similar electronics as the standard one.

Logs drip count up to 65K per sample period, 2 sample periods can be selected, 30min,1 hr.

Also logs temperature and real time.

Minimum water drip height required: 120mm

Will float, completely water tight.

Data stored on removable SD card.

Four year battery life.

(Note: no display, no Atmospheric pressure logging)

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 Bigger drip capture area but quite a flat module. Very sensitive, will capture drips from >30mm drop height.  

Will capture rain droplets without the need for a funnel.

The module is 70mm dia x 28mm high.

 Packed with similar electronics as the standard one.

Logs drip count up to 65K per sample period. 

Now has 8 sample periods that may be selected, 

1Sec, 1min, 10 min, 15 min, 30min,1 hr. 12 hr, 24 hr

Also logs temperature and real time.

Minimum water drip height required for normal setting: 60mm

Switch for extra sensitiviy now included, will capture drip height down to 30cm.

Will float, completely water tight.

Data stored on removable SD card.

Four year battery life (30 min and above sampling)

Will capture up to 20 drips/second

(Note: no display, no Atmospheric pressure logging)


Comes complete with SD card and battery fitted. As these units are so low powered they have no on/off switch, they are forever logging data.

If the SD card is removed they will carry on counting drips up to 65K and log the final count when an SD card is inserted.

The internal clock may now be set by the customer via a USB interface cable (supplied seperatly).

The extra sensitiviy mode is selectable via a small switch, the logger then becomes an ultra sensitive device and easily captures drips < 30mm drop height.

Extra modifications may be applied as to customers requirements, including ultra high sensitivity modes.

An external humidity and temperature sensor may be added as an optional extra module.

A 0.3m lead connected through the side of the base section goes to a accurate humidity sensor which also includes it's own temperature sensor, both mounted in a robust drip proof module.

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Can be used with the rainfall housing, easily clips inside. Very stable design.

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Currently deployed in a cave system in Buxton UK

Water height data logger and alarm system with Auto dialler
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poole water-box (2).xls
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Currently undergoing design proving within a research cave in Buxton. The main use for this unit is for show cave systems including the Eden Project for public display and for commercial greenhouse growers.

Battery operated, PIR sensor activated and ability to operate under harsh conditions. Enclosure is drip proof.

All data is logged in the background at 15 min, 30 min, or 1 hour sample rates onto micro sd card.

Internal fan purges the air before each CO2 reading is taken to ensure correct current values are displayed and logged.

A radio link may be added inside the housing to enable it to be positioned further into a cave system.

Enclosure size 180 x 180 x 60mm

A quad band Auto Dialer module may also be added inside the housing. This will send a text message to warn that the CO2 level has passed the pre-set trigger level of CO2 gas, levels up to 10,000ppm may be set.

Two mobile phone numbers can be included.

A standard USB cable and freeware software is used to load phone numbers and select the CO2 trigger threshold.

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The waterproof case houses the electronis and batteries.

The batteries are standard off-the-shelf  'D' cell type batteries and should last for over a year in normal operation.

The electonics include a real time clock that can be set to initiate a sample logging period once evey 30 minutes or once every hour, selected by a small switch.

The sensor unit also houses an air temperature sensor, this temperature is logged at each sample period, along with left & right airflow values, airflow direction, attenuation settings,

atmospheric air pressure and box temperature.

All data is logged onto a standard SD card and simply loads into excel type packages.

 A small display on the electronics board is used to initiate a diagnostics routine that allows instant review of the current air flow values, temperature values, air pressure value and current time.

This feature is a great tool for setting to work and for also giving a confidence check before leaving the equipment for a few months.






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Rain fall logger housing, uses the 'Big-Drip' data logger to count the drips from the catchment funnel.  The funnel uses a 'wick' system to control the drip size and flow rate.

Easy to calibrate, poor in a known about of water and check the drip count before and after.

A pond filter foam insert in the funnel is used to catch any debris.

No moving parts, can be left for months.

The logger just clips into the internal tube.

Very stable unit and very robust, based on traffic cone design with heavy rubberised base.

Spy hole shows LED flashing at the drip rate.

Does not require to be perfectly vertical (+/- 5 deg) when using with the 'Big-Drip' logger.


Drip-In-Time logger may also be used within the housing.

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Rainfall Logger housing_4.pdf
Housing Specification
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