The res8 Datalogger features 8 multiplexed resistive sensor inputs housed in a waterproof enclosure. An on-board temperature and humidity sensor monitors the enclosure environment. An extreme low-power timer provides long battery life during deployments. A single component swap-out enables SD card datalogging, WiFi telemetry, or LoRa deployments (in development).
The res8 maintains long battery life during field deployments by only waking up the main circuitry on a timer, staying in deep-sleep mode during most of the deployment. The RTC maintains a timestamp with its own dedicated 3V coin-cell battery.
You can select a reading interval at which the res8 wakes up by changing the dip switches on the timer board. For the most straightforward timer options, move just one switch to the ON position and leave all others OFF (left table). More timing options can be enabled by switching multiple switches to the ON position (right table):
| Timer | Switch |
|---|---|
| 30 s | A |
| 1 min | B |
| 30 min | C |
| 1 hr | D |
| 2 hr | E |
| Timer | Switch Combo |
|---|---|
| 5 s | A+B+E |
| 10 s | A+C+D+E |
| 20 s | A+D |
| 40 s | B+D |
| 8 min | C+D |
| 15 min | D+E |
Powering on the device is as simple as plugging the proper LiPo battery into the Low-Power Timer port (LiPo Battery Power).
Note - do not use the battery port on the microcontroller to power the device (Do Not Use!). While this will not hurt the device, it will not function properly as a datalogger.
It is very important to ensure that the battery being used has the correct polarity. The polarity is shown on the PCB silkscreen of the res8 so that it can be checked before power-up. Reversing this polarity can overload the timer circuit and brick the device.
Upon powering up, a red LED with briefly light up on the timer board and on the RCT. To trigger a manual reading at any time, press the gold button on the timer board (Manually Sample).
[instructions coming soon]