I am working on a low budget class project, and we need to figure out how to measure pO2, pCO2, and pH in a liquid simultaneously for continuous output as these values change. We are struggling to find existing sensors to measure these things. Does anyone have any recommendations or alternative solution suggestions (i.e. a way to indirectly measure these values)? We are ideally looking for lightweight, smaller sensors rather than bulky sensors.
Low budget might be a problem. The sensors you are looking for are all pretty common sensors, the problem is they are not quite inexpensive. Another problem is that if you are measuring in a tank you also need some agitation to prevent stratification of layers of whatever is in the tank.
Companies like Omega Engineering market the sensors. I am not sure what is available "off the boat". You make no mention of what output you want your sensors to have? Sensors like this are normally found in solutions of plant nutrients.
A simple Google will bring up plenty of sensors so look for inexpensive sensors and try a Google of for example PH Sensor Arduino, Dissolved CO2 Sensor Arduino and last Dissolved Oxygen Sensor Arduino. That should get you something to work from.
Ron
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Heartrate, spO2, et c.
pH
I have used DO and pH sensors from atlas-scientific
easy to use UART or I2C interface and sample software drivers available
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