So if you are using multiple sensors you may need to remove the pull-up resistors from some of your sensor boards because those resistors also end up in parallel, and this can place too much pull on those bus lines for the sensors to overcome. The DS3231 RTC breakout board in this build puts 4.7k pull-ups on the SCL & SDA lines that we tap at the cascade port. This guide shows pictures of several including an Adafruit MCP9808 temperature sensor and a MS5803-05 pressure sensor, but the four standard bus connections (VCC, GND, SCL & SDA) would be the same for any I2C sensor and they all get connected in parallel. Many sensors are available on I2C breakout boards. You can connect and test your completed LED with your logger platform running the Blink sketch, by replacing the default pin number 13 in the code with 4, 5 & 6 respectively. Make sure that the other side of the connector is attached while you are soldering so that the plastic doesn’t melt out of shape. The LED wires will be connected to the male side of a black WSD1241 Micro 4B plug connector, maintaining the same R, G, B, & GND pattern used on the corresponding logger side connector. Trim the LED wires to the same length, then strip, twist and tin the ends. Carefully bend the leads to a 90 degree angle to facilitate mounting in the housing cap later.Ĥ. Solder them to the respective LED connections and use shrink wrap to protect the joins. Cut 4” lengths of Red, Green, Blue, and Black wire.
#Mini battery logger full
On some RGB LEDs, green is 2-3 times brighter than the other colors, so you can add a second 20-30K ohm resistor to the Green LED line if you power budget is tight, although this will make the green indicator hard to see in full sunlight.ģ. Trim and add a 30 K ohm limit resistor to the GND line. Usually the red lead is the one closest to the FLAT side of the led, and the ground pin is the longest lead but there is variation between manufacturers, etc.Ģ. Note which lead is for red, green, and blue. Test the common cathode LED with a 3v CR2032 coin cell battery by connecting the GND (usually the longest wire) to the negative side of the battery and each other wire to the positive side of the cell in turn. If you are landing on this page for the first time, it might be a good idea to start at the beginningof the series.ġ. Part 1 of this series covered preparation of the 3 core components for assembly, and Part 2 described connection of those components into a functioning logger.
#Mini battery logger pro
Note: This is the third tutorial in a series providing detailed build instructions for a DIY data logger based on a Pro Mini style Arduino board.
Build Instructions – Part 3: Sensors & Housing
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