Maintenance Update

Location: Black Rock Forest/Red Maple SSC

All units reporting as expected. Replaced the standard Voltaic Systems 4,000 mAh battery in “The Super Stars” reporter with 3 D Cell batteries, hoping to lease double longevity of the unit. Initial voltage of the battery pack was 4.8v.

Maintenance Update

Location: Black Rock Forest/Red Maple SSC

“The Homers” is now reporting. Before conducting signal tests, the main board and the ADC board were replaced. The Xbee and CPU were retained. This was done to eliminate soldering/construction problems. However, that seems to have been the problem. The unit is now reporting and data is available under public reports.

Maintenance Update

Location: Black Rock Forest/Red Maple SSC

Because of low numbers on reporting unit “Super Stars”, I readjusted the dendrometer and cleared the data.

Unit “The Homers” is not reporting. This is most likely due to poor signal strength. I will use this as an opportunity to develop mesh networking capabilities.

Other units required no changes.

Location: LDEO/Testing and Evaluation

Unit ran from 14 July to 21 July, almost a full 7 days. I replaced the battery today and performed basic inspection. It required no other changes.

Remember you can find public reports here.

News Update: Post-Camp and Battery Usage

What’s Happening

The Make: Nature workshop at this summer’s Black Rock Forest Summer Science Camp was a success! Twelve awesome kids got a chance to learn to how to solder and the basics of circuitry. They used those skills to construct and deploy their electronic, wireless point dendrometers on four red maples near the science center. Looking at the data collected with their devices, the kids got to compare their hypothesis of tree stem shrinkage and swelling from water use against actual dendrometer data. Be sure to head over to the data collection site to check out the charts!

On the Technical Side

There seems to be a bit of variability on battery longevity. The last charge at the Lamont installation lasted over 6 days. This would indicate a variation in current usage by the reporting unit, perhaps related to heat.

News Update: Pre-Camp and Battery Usage

What’s Happening

Next week we will be assembling and deploying four new dendrometers at the Black Rock Forest Consortium Summer Science Camp. A number of middle schoolers will be able to see what goes into constructing and installing the dendrometers and get a chance to answer some questions about how our trees change from day to day.

On the Technical Side

It seems that wet foliage and understory can contribute to signal loss when the signal is weak to begin with. At the research and development network at the Lamont Doherty site we experienced signal loss after rain. After repositioning the logging unit in a window we experienced much improved results. We also changed radio frequency settings to avoid interference from nearby wifi.

Battery life is at 5 days using a 4,000 mAh battery. In development is expanding the reporting period to improve battery life.

Welcome

Greetings. This site is currently being set up but will provide the latest updates on the development of the dendrometer project. Feel free to sign up to the mailing list. This list will provide updates to the project.