| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| kinasmith | "I've read through the datasheet/manual for this sensor. Their use of audio connectors for signal and power connections is pretty questionable, but ..." | Read more » | over 6 years ago | |||
| cfastie | "Liz, I don't know the specs of the 1/4" phone plug, but it needs only two contacts, the tip and one ring along the shaft. I'm not sure which types ..." | Read more » | over 6 years ago | |||
| warren | "Thanks to all the software contributors who helped fix that -- @siaw23 @sagarpreet " | Read more » | over 6 years ago | |||
| warren | "OK - links and uploads now working again on the site! " | Read more » | over 6 years ago | |||
| liz | "wow awesome! @cfastie sorry to ask more but can you draw a picture on paper of what you expect these cables to look like? "A 1/4" stereo/phone plug..." | Read more » | over 6 years ago | |||
| zengirl2 | "@cfastie @warren ah, ok that makes sense now. " | Read more » | over 6 years ago | |||
| warren | "https://gist.github.com/jywarren/599b76ef9cdecdce764a7348f728ae31 " | Read more » | over 6 years ago | |||
| warren | "We're still struggling with a comment formatting bug -- apologies -- over in https://github.com/publiclab/plots2/pull/2605 -- here it is for the ti..." | Read more » | over 6 years ago | |||
| cfastie | "New answer below where I could attach a file. " | Read more » | over 6 years ago | |||
| cfastie | "A 1/4" stereo/phone plug connects to the HCHO sensor and two wires from that cable connect to the Arduino (tip of plug to A3, ring to GND). Below (..." | Read more » | over 6 years ago | |||
| zengirl2 | "@liz I can meet with @nshapiro with some Arduinos, but I think my question is where do you attach alligator clips or wires for testing this beast? " | Read more » | over 6 years ago | |||
| liz | "Perhaps @Zengirl2 can go over the Nick's house and bring an Arduino? (They are both in Philly) and for good measure we can open up a video link wit..." | Read more » | over 6 years ago | |||
| cfastie | "The first step might be to arrange for the co-location of the HCHO sensor, an Arduino, and somebody casually familiar with Arduino. Has the proper ..." | Read more » | over 6 years ago | |||
| liz | "Hi @cfastie -- thank you so much for asking these questions. Here's what i know -- Nick has to go to Georgia with a working solution in 2 weeks...." | Read more » | over 6 years ago | |||
| cfastie | "Kina, Thanks for the great information. Liz, It might help to know more about this project. What is the time frame for deployment? What has been tr..." | Read more » | over 6 years ago | |||
| liz | "Please give me a call at +1 336-269-1539 " | Read more » | over 6 years ago | |||
| liz | "OK awesome @kinasmith and @cfastie ! What would be helpful for me to do as a facilitator to help Nick get all the way there? Here's some ideas: 1) ..." | Read more » | over 6 years ago | |||
| kinasmith | "this is actually an excellent solution to this problem without adding additional parts/complexity. The 1.1v internal reference is much more stable ..." | Read more » | over 6 years ago | |||
| kinasmith | "I'll just chime in here for a second as someone who has worked a lot with arduino dataloggers and ADC's, etc. I agree with @cfastie on all points...." | Read more » | over 6 years ago | |||
| Bronwen | "Apologies for the mass tagging here, I know a lot of you have been in the mix providing great support and advice so far, but if anyone feels they h..." | Read more » | over 6 years ago | |||
| cfastie | "There is a very simple way to read the HCHO sensor with a resolution of about 10 ppb, assuming the range of the sensor is 0 to 1000ppb. (Out of the..." | Read more » | over 6 years ago | |||
| Alastair_ | "8-Bit resolution is fine i'd think, you just need to amplify the signal. Any first year electrical engineering student worth her salt can design th..." | Read more » | over 6 years ago | |||
| warren | "I'd like to try to get input from some of the many people at http://publiclab.org/contributors/datalogger who have almost certainly interfaced thei..." | Read more » | over 6 years ago | |||
| nshapiro | "Thanks so much, Chris! So it does look like the relationship is linear between output and ppb. here is what a friend writes who has used this tool ..." | Read more » | over 6 years ago |