Data logger, oscilloscope, signal generator and more!

DrDAQ is a versatile instrument that connects to the USB port of any PC. Using the supplied PicoScope software it can be used as an oscilloscope, spectrum analyzer and signal generator.

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Respiration of maggots


Educational data acquisition

Suitable for 9-19 KS3 KS4 KS5

Aerobic respiration is the process in which glucose and oxygen, through the action of enzymes in mitochondria, produce carbon dioxide, water and lots of energy. In this experiment the use of oxygen in the aerobic respiration of maggots can be seen in that, in a sealed container, the level of oxygen reduces with time.

Equipment required

  • PC with PicoLog datalogging software installed
  • DrDAQ data logger
  • Oxygen in air sensor
  • Temperature sensor
  • 2 litre beaker
  • 100 ml beaker
  • beehive shelf
  • gauze fabric
  • rubber bands
  • trough - ice-cream container
  • water
  • live maggots (keep in fridge until ready for use) - available from fishing tackle shops

Experiment set up

  1. Connect the DrDAQ datalogger to the parallel port (or USB if you are using a USB to parallel port adaptor).
  2. Fix the temperature sensor to the oxygen sensor with a couple of rubber bands and mount them pointing upwards on the beehive shelf. A little Blu Tack is useful for anchoring them in place securely. Run their connecting leads through the central hole of the beehive shelf.
  3. Fill the trough with water at room temperature to a depth of about 3cm and place the beehive shelf with the sensors into it. Plug their connecting leads into External sockets 1 and 2 on DrDAQ.
  4. Put about thirty maggots into the 100 ml  beaker, place a piece of gauze fabric over its open end and anchor in place with a rubber band. Place this beaker in the water alongside the beehive shelf. You may find it useful to anchor it down with Blu Tack.
  5. Now place the 2 litre beaker, upside down, over the beehive shelf and 100 ml  beaker and into the water so that it seals in the air.
Respiration experiment equipment setup

Figure 1: the equipment set up

A centrally heated and thermostatically controlled room or laboratory should not change much in temperature, probably only of the order of 2-3 °C, assuming that windows are not suddenly opened or lots of bunsen burners lit.

Carrying out the experiment

  1. Load PicoLog and configure it to collect readings of the oxygen and temperature sensors every minute for a whole day (1440 samples).
  2. Set it to start recording.
  3. When datalogging is complete, display the graphs of % oxygen and temperature against time.

Further study

An extension to the experiment could be to place the trough, beehive shelf, beakers. maggots, etc into a thermostatically controlled heated water-bath, or on a hot-plate, and see if temperature affects the rate of respiration and so the speed of uptake of oxygen. Temperatures up to around 40°C are OK.

A further investigation could be to see if light intensity has any effect, illuminating the maggots with a light bulb and additionally recording the light level. One of the energy-saving fluorescent bulbs should be used so that little direct heating is caused. Readings should then be collected from the oxygen and temperature sensors connected to DrDAQ externally and from DrDAQ’s on-board light level sensor.

Credits, comments and further info

This experiment was written by Chris A Butlin of Sutton upon Derwent, UK.


  • The kit (2408B) is of obvious quality, easy to setup and calibrate and the free to download software has a reasonable learning curve. Superb kit, superb support, what more can I say.

    Rop Honnor
  • I have been using my 4224 PicoScope for years. I travel abroad so this has been ideal due to its physical size. Storage of waveforms on my Laptop is very easy allowing me to quickly email waveforms to my Colleagues.

  • Not many USB scopes works on Win & Mac & Linux too, so that proves me that guys from Pico really cares about us, customers. This made my decision much easier when I was looking to buy an USB scope.

    Raul Trifan
  • We have been using Picoscope 6404D for quite some time, and are amazed by its accuracy and powerful emulations while working with numerous signal evaluations.

    J Mohanty
  • PicoLog TC-08: This is a very nice unit that works consistently and reliably.

    Jeff Hulett
  • It is a great scope. I had a weird problem - it did not work on one of my PC’s. Customer service gave me first class service. If I could give 6 stars for customer service - I would do so.

    Niels Larsen
  • Perfect Partner for Development of Encoder controlled Stepper Motor Actuators. Since the included software is really stable, this type of device is a great tool for great tasks!

    Helmut Schoettner
  • A superb piece of equipment worth its weight in gold

    Nigel Clinch
  • So simple to use & beats any other I have ever used hands down.

    John D Samsing
  • Rather than webcam our benchtop scope screen, it was suggested we use a PicoScope to share waveforms via screen share.

    We were a bit hesitant at first … but it worked flawlessly, and everybody is now out shopping for PicoScopes!

    T Lövskog • SVP of Innovation at Additude AB
  • Great functionality in a compact size. I really like moving the mouse pointer to a position and having the Time and Voltage display the values at that point. Calibration equipment is a breeze with that feature.

    Don Horein

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