Data loggers can help to record data from a sensor over time -- often over days or weeks, or even months. There are a variety of data loggers available, both commercial and open source. Each entry from a logger -- stored on, for example, a memory card -- may have a timestamp and some data loggers can record location from a GPS as well. Data loggers can be [paired with specific sensors](/wiki/water-sensors), and an [enclosure](/wiki/sensor-enclosures), as part of a test. ## Design constraints What are we trying to do that existing commercial data loggers don't do, or don't do well enough? We're looking for designs that optimize: * low cost (i.e. <$100) * easy to use * easy to build or buy * weatherproof (possibly) * waterproof (possibly) * Arduino-compatible (so that they're compatible with the huge [Arduino](http://arduino.cc) ecosystem) ## Options Most of the below options are #arduino based, and all are open source: [wikis:datalogger] [notes:datalogger-option] Edit the [full spreadsheet here](https://docs.google.com/spreadsheets/d/1zBcLpN4PZIATLh6aDR7mwCoejWryLYYm6cJD38MqT58/edit) (by @cfastie) **** ## Questions [questions:data-logging] ## Activities We're hoping to collect a set of activities you could do with several different data loggers here, such as an example "field test," so please add help us by adding activities which can be performed with different data loggers: [activities:data-logging] **** ## Power How do you keep a data logger going in the field? Solar, big batteries, even run an extension cable out? We're developing resources on powering your data-loggers here. ## Power Questions [questions:data-logging-power] ## Activities [activities:data-logging-power] **** ## Waterproof enclosures The #riffle project -- and others -- have explored a lot of ways to make cheap waterproof enclosures for data loggers, but where wires and sensors can still stick out. Here are a some notes and prototypes under the tag #data-logger-enclosures. You can also visit the page on [sensor enclosures here](https://publiclab.org/wiki/sensor-enclosures) [notes:data-logger-enclosures] ...
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liz | "Hi @madtinker, oh there's interest! as @shanlter said, the best place to document your build is by clicking the blue button "Click here to replicat..." | Read more » | about 7 years ago | |||
shanlter | "@MadTinker, awesome!! I'm trying to get familiar with Public Lab's logic as well, I guess the best way to document is by replicating an activity? A..." | Read more » | about 7 years ago | |||
MadTinker | "@shantler @rockets et al... FWIW - I ordered the (majority) of the parts needed for a KnowFlow related system (sans the DO sensor and the enclosure..." | Read more » | about 7 years ago | |||
MadTinker | "@gretchengehrke Thanks! That's kinda what I thought, but wasn't sure. I'll likely end up with both since the professional measurement suite has his..." | Read more » | about 7 years ago | |||
gretchengehrke | "Hi @MadTinker, oxidation-reduction potential (ORP) and power of hydrogen (pH) measure different chemical properties: ORP provides information about..." | Read more » | about 7 years ago | |||
liz | "Hi @xose , @shantler did create a method page, and this now appears there as an activity! Check it out: https://publiclab.org/wiki/knowflow " | Read more » | about 7 years ago | |||
MadTinker | "@rockets Thanks for the summary. I thought I was going to have to move in a different direction, but this clears things up. Cheers. " | Read more » | about 7 years ago | |||
ramarro | "@shanlter i havent wrote anything about my project its just an hobbies for my aquarium :) @rockets I am using my project to control my reef aquar..." | Read more » | about 7 years ago | |||
rockets | " DFR0504_Analog_Isolation_Module-V1.0-_Schematic.pdf here is the schematic of the isolator. " | Read more » | about 7 years ago | |||
shanlter | "Thanks @rockets! I hope this could help answering your questions, @ramarro. btw, The GUI of your controller looks so nice! Where can I learn more a..." | Read more » | about 7 years ago | |||
rockets | "I just try translate youyou's answer into english. Q:The parts for the KnowFlow-esque are going to be ordered from DFRobot and was wondering if yo..." | Read more » | about 7 years ago | |||
warren | "@pdhixenbaugh - any thoughts on this? " | Read more » | about 7 years ago | |||
ramarro | "@shanlter i think that DFR EC will be better than what i use, at least after a brief look to the circuit. i will order one, and try it as well, if ..." | Read more » | about 7 years ago | |||
shanlter | "Yes, you got it :) @MadTinker If you want to use DFRobot's EC sensor, you'd better test your sample with a TDS pen first (which only costs several ..." | Read more » | about 7 years ago | |||
shanlter | "@ramarro, you tried so many stuff! Thanks for the info on EC, I am learning it. Lots of the questions you mentioned I don't know the answer, I aske..." | Read more » | about 7 years ago | |||
MadTinker | "@shanlter @ramarro Dang, got lost in the comments .... my bad. " | Read more » | about 7 years ago | |||
ramarro | "@MadTinker, @shanlter use DFRobot EC probe. I am using EC_mini_v31 we are two different person :) using 2 different devices for a similar project..." | Read more » | about 7 years ago | |||
MadTinker | "@shanlter A little confused about what you used for EC. The KnowFlow spec sheets indicates a DFRobot EC sensor, but in the above you indicate som..." | Read more » | about 7 years ago | |||
ramarro | "i forget to add some details :) even if you use 2 arduino, at least in my scenario, and u want them communicate in some way, you have to use a com..." | Read more » | about 7 years ago | |||
ramarro | "@shanlter using 2 arduino (or 20) doesn't change anything, unless you use galvanically isulated ac/dc converter. if you power them from the same s..." | Read more » | about 7 years ago | |||
shanlter | "@ramarro totally agree! When I first use their sensors, I also have the same problem. I asked them and was told to use several Arduino boards for e..." | Read more » | about 7 years ago | |||
ramarro | "@shanlter did you have the opportunities to talk with dfrobot team? i have purchased a ph shield from them, and after some experiment i noticed th..." | Read more » | about 7 years ago | |||
shanlter | "@MadTinker, according to my knowledge, the reason why to use "isolation" is to avoid interrupting between sensors. Both OPR and EC need isolation. ..." | Read more » | about 7 years ago | |||
shanlter | "Hi @MadTinker, thanks for your question! I just saw your questions around dataloggers for pH! I think DFRobots' isolation module is not online yet ..." | Read more » | about 7 years ago |