time:1h
time:1h


Author Comment Last activity Moderation
warren "This is really cool. A recording would mean you could calibrate it later, too -- if you maybe dipped it in 2 different high and low solutions of kn..." | Read more » almost 6 years ago
warren "Oooooohhhhhhhh!!!!! " | Read more » almost 6 years ago
xose "Added a 3.5mm jack to record the wave ;D " | Read more » almost 6 years ago
warren "Hi! I made a bookletized version of the pdf for printing on half-letter-sized paper -- Booklet_Sensor_Journalism_Final.pdf " | Read more » almost 6 years ago
warren "@kanarinka - we're planning to order a bunch of these to test out at MakeFaire SF at the end of may -- getting ready for a big order, and printing ..." | Read more » almost 6 years ago
warren " " | Read more » almost 6 years ago
gretchengehrke "@warren, I thought the sandpaper we used (that was like a polisher) worked well to remove grime on the surface of the copper, which is its purpose...." | Read more » about 6 years ago
warren "And do you have to discard the sandpaper on each use, or can it be used over and over? Thanks! " | Read more » about 6 years ago
warren "Hi, i saw you mentioned: it’s almost more like a polisher regarding the sandpaper -- was that a bad thing? Would you opt for a different grade of..." | Read more » about 6 years ago
warren "Just linking in here to the question where some of us have been looking for different materials and setups to do this test with: https://publiclab..." | Read more » about 6 years ago
warren "Hi, gretchen - the photos are great. Do you have a list of Amazon links and prices you could add -- as a step in getting a prototyping kit together..." | Read more » over 6 years ago
gretchengehrke "Here are before and after photos. We did not expect (and did not observe) any discoloration since we were only putting them out for less than 24 ho..." | Read more » over 6 years ago
gretchengehrke "Here is a picture after sanding one of the little copper strips. The green pad is actually soft sandpaper / polishing paper. " | Read more » over 6 years ago
gretchengehrke "Here is a picture of cutting the copper sheet into strips. " | Read more » over 6 years ago
gretchengehrke "Hi @warren, Thanks for the reminder to add pictures. I have tried inserting photos a few times today, but it keeps crashing the edit (and, seemingl..." | Read more » over 6 years ago
warren "And if there are any photos of these steps, i'd love to help make diagrams to illustrate the process! " | Read more » over 6 years ago
warren "Hi! Do you have photos you can attach for what the copper should look like before/after H2S exposure? Or after any possible false positives? " | Read more » over 6 years ago
zengirl2 "@gretchengehrke OK, ty for the response. Sounds like I need to check manufacturers about the copper tape to see how pure it is. Also, I was thinkin..." | Read more » over 6 years ago
gretchengehrke "Hi @Zengirl2, I'm not sure about the copper strips. Whatever copper is used needs to be fairly pure, and I'm not sure if the copper tape is pure c..." | Read more » over 6 years ago
zengirl2 "@gretchengehrke Do you know if copper tape can be used? I'm considering giving testers out at the Factory Farm Summit mounted on cardboard. Also, s..." | Read more » over 6 years ago
warren "And with some small extra tweaks and an extra diagram: foldable-2.0.4.pdf " | Read more » over 6 years ago
warren " foldable-2.0.3.pdf With instructions!!! Almost there. " | Read more » over 6 years ago
warren "Instructions! https://docs.google.com/presentation/d/1nLSUPLimHnQIJrKsrK4z9nqZmEezASSCkeWNZ1TxuLY/edit#slide=id.g274670c60f_0_0 Papercraft-Spectr..." | Read more » over 6 years ago
warren "Update -- I removed the tab-and-slots, to simplify cutting a bit, and added some instructions on how to cut out the windows with just scissors (thi..." | Read more » over 6 years ago