This page is under development March 2016. [](//i.publiclab.org/system/images/photos/000/014/633/original/agbdunderconstruction7.gif) [](//i.publiclab.org/system/images/photos/000/014/652/original/betta_fish_avatar_by_theamazingchair.gif) ###Activities **Activity 1:** take a picture of the Riffle [?] * this activity can be done by an individual * YYYY-MM-DD When Riffles will be mailed out * [X hours/days/weeks] How much time you will need to test the Riffle * YYYY-MM-DD When participants need to send pictures back by **Activity 2: ** automate way to trigger camera to snap picture of submerged secci disk. [Don](/people/donblair) will lead development and also act as maintainer in the [Public Lab's open hardware process](/wiki/contributing-to-public-lab-hardware). * this activity can be done by individuals or groups, but requires coordination with other developers according to the development timeline * YYYY-MM-DD public discussion on the approach * YYYY-MM-DD submit contributions by this day * YYYY-MM-DD integration of contributions * YYYY-MM-DD 1.0 release **Other Activities:** other sensor development, lots of low-hanging fruit listed here, have fun! ###Communication * We are going to kick it all off with a Live Call on [Tuesday, March 8] [1pm PT/ 4pm EST] * Email discussion will happen on [plots-waterquality list](https://groups.google.com/group/plots-waterquality), and ... * Research notes will be tagged with "riffle" [subscribe here](https://publiclab.org/tag/riffle) * Certain areas with multiple participants and supporting organizations may host local events ...
| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| mathew | "It would make sense that the riffle's boot up over draws one of the capacitors. On the Lithium Ion battery issue, can you clarify a little for me?..." | Read more » | about 8 years ago | |||
| ggallant | "Mathew - This is probably the result of a capacitor discharging, C9 is only 0.1uf. I suspect that C14 needs to be much larger (100uf) or add multi..." | Read more » | about 8 years ago | |||
| cfastie | "Hi Gretchen, I also wondered whether the change in logging frequency was caused by the Riffle dropping below 0°C. There is more about that possibi..." | Read more » | about 8 years ago | |||
| gretchengehrke | "Interesting! At first I was wondering if the change in time-step occurred after the Riffle reached 0 deg-C, but then when I looked at your data tab..." | Read more » | about 8 years ago | |||
| mathew | "i'm talking out of my depth here-- I know basic electronics and am not an electrical engineer by any stretch-- but a quick 1.9v dip sounds to me li..." | Read more » | about 8 years ago | |||
| ggallant | " This is a screen shot of the noise spike when turning on power to the SD card. The yellow signal is the CPU D10 line being used as a sync signal...." | Read more » | about 8 years ago | |||
| ggallant | "I have isolated it to the SD card power turn on. There is 100% repeatable noise spike that is 1.3usec long and drops 1.9V below 3.3V. Trying to upl..." | Read more » | about 8 years ago | |||
| mathew | "I'm wondering if it just has to do with the power switch setting. it should be on "USB/Lith" for programming. " | Read more » | about 8 years ago | |||
| mathew | "Glad to see it got working, at least somewhat. the trouble is troublesome, those are all brand-new errors for me and definitely sound like issues..." | Read more » | about 8 years ago | |||
| mathew | "I wonder about the erratic battery readings. fascinating. Chris-- which sensors do you want to attach? perhaps we can find an arduino tutorial th..." | Read more » | about 8 years ago |