Hi, MadTinker, thanks for the info here. I was just wondering if you meant that the Coqui itself was noisy, or if you're referring to noise in the data -- thanks! (funny question i guess).
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I've successfully used the DFRobot TDS/conductivity sensor combined with the a Mini-Pearl system. The Coqui was much too noisy. My Arduino setup was very similar to the setup suggested by @cfastie. I did not seem to have a problem with noisy measurements that were noted by Chris. However, this may have been due to a lower sampling rate over the 3 months that my unit was deployed. My major problem was related to moss and nutrient buildup on the probes; this in turn was likely due to drop in water depth and over exposure to sunlight. My sampling area was hit by a major drought (down to single digit CFS). I am also investigating (or will soon) use of a non-SD card solution. My goal is to have a rec'r in a 'wand' that I can pass over the unit and 'suck' the data off the unit. I won't be back on either of these until spring due to some continuing, rather serious, health issues, a change management of the watershed of interest, and then the spring thaw here in the Rockies. I hope to resurrect the Willow Creek and will either update or seriously gut the related write-ups.
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