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I’m looking for a Cootwo (CO and O2 analyzer). Sadly Divenav is no more so wondered if anyone has one in a drawer not being used and would like to part with it. The oxygen sensor in mine leaked electrolyte and damaged the motherboard so it is inoperable. I don’t necessarily need the sensors...

You can overcome the nuisance warning but setting the date of the clock in the Cootwo into the past (using the App). If the app is no longer in the Apple store then it is not easy to get it. You need to find someone with the app and then use specialist software to copy it between devices. If...

The sensors are supplied with a shorting link (spring). This allows the sensor to catalyse any CO it is exposed to while in storage and prevent the sensor from becoming 'polarised' (which can take a long time to clear on installation). You did the right thing removing it. The electronic circuit...

If you could do it 'dry' and make a Rix alternative that would be super interesting!!

Charlie's Soap Natural Liquid Laundry Detergent is recommended by Weezle (one of the best thermal undergarment manufacturers around). I've used it on both my wetsuit and thermals and it works very well indeed.

@super scrubber check out this article - Rebreathers and CO2 – Fact, Fiction and Voodoo, it will help you understand more about CO2 and how the end point of a scrubber is measured. The CE test standard for rebreathers is EN14143.

Nice work. The City Technology 2CF3 is the current version of 2CF. The DD-Scientific GS+4CO2H certainly appears a suitable alternative.

Thanks for reposting this again David. I used your excellent work in my MS Excel workbook YaGaMiC and have been happily blending accurately ever since :cool: Post edit at Akimbo's request to include a copy of the spreadsheet... I wrote this in 2016 when I did not have access to J's of pure...

The green housing is just an 'adapter' fitted over the CO sensor. In the past I've been able to separate them by applying pressure around the circumference and easing the sensor out. A little heat can help too. Once you have the adapter you can press in a new CO sensor, such as the GS+4CO2H...

I expect it is M16 x 1.0P METRIC FINE PITCH, the same as their oxygen sensor. Looks like a standard 4-series 3-pin CO sensor inserted into their green housing. Something like your GS+4CO2H or even GS+4CO might do the trick but sadly I don't have an EII CO detector to play with. Here are some...

The @ddscientific S+4 2ECOH sensor (0 - 200 ppm CO) is used in the Cootwo dual O2/CO analyser (which sadly is no longer manufactured following the closing of @DiveNav).

I rechecked my logs and the figures I quoted seem correct, perhaps 7 hours dive time not 6 but certainly not 20. My lid has the pre-2014 potted controller module so maybe that has higher consumption. Controller 1 is powered from B1, and Controller 2 is powered from B2. So B2 is not passive in...

With Vision 2020 colour; CR223 batteries, MK3 solenoid, using recommended 'Energizer' brand batteries, and following the standard battery rotation procedure per the manual I get roughly the following: Battery move B2 to B1 ... 3 bars, 6 hours dive time 2 bars, 2 hours dive time 1 bar, 1 hour...

I've got a box of parts on my desk but not had time to put any circuits together or code some test firmware. So would be very interesting to know more about your transmitter circuit.

My transmitter is quite old and was bought used so I have no idea which 'brand' it was. Serial # is BM-108062 11/11

It works fine, it is truly an international system. I live in United Kingdom but carry a PLB that is coded for USA. I cannot register it with the UK authorities due to the coding and the manufacturer can't or won't recode it. However, I can register it in USA (NOAA) with my UK contact details...

It is a cheap way of getting a low power H-Bridge driver. Instead of driving the antenna coil single sided (i.e. one side permanently to ground and the other switched to supply) an H-Bridge allows both sides of the antenna coil to be driven independently to supply or ground. This allows the...

I've ordered some parts to build an antenna and have an Arduino UNO available from another project to run it. I'm going to start with the transmitter aspect and see if I can get it to work as that will be the simplest starting point. I've bought a BD623 Motor Driver to buffer the output of the...

In the FCC documentation we can see a photo of the Swift coil (link)... it appears to be ~ 17 turns around a ferrite. I estimate the ferrite to be approximately 6.35mm diameter by 35mm length and the 'magnet wire' to be approximately 24 AWG (0.5mm dia), coil length around 8.5mm. Been a very...

Shouldn't need the DAC, just a port pin and bang out 38Khz square wave pulses into a suitable coil/ferrite antenna. Use the ADC to read the battery voltage and output every 5 seconds, job done. Could even set some thresholds for 'low' and 'critical' voltages. There are many Arduino 'remote...