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Published October 8, 2019 | Version V2
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OPEnSLab-OSU/OPEnS-Hypnos: Hypnos V2

Description

Second stable version of Hypnos board that proved to work with microSD, mosfet circuitry, and RTC DS3231.

Overview

Long term power conservation is very important in remote sensor package deployment. Originally, the Feather M0 had a non-efficient deep sleep code and would require other sleep methods. The first solution was to completely cut the power to the Feather and its peripherals and only power back when back into operation. However, when Adafruit releases new firmware update for Feather M0 with very low sleep current, the power circuit can now be simplified and more add on is possible on the same footprint. The next version of OpenSPower is called Hypnos.

Description

Hypnos has the ability to completely cut off power for peripherals while keeping the feather awake to run deep sleep code. More than just a powerboard, the Hypnos board comes with high precision real-time clock DS3231 and a microSD card for logging data during operation.

Specification
  • Ability to fully control 3.3V rail and 5V rail (if powered from USB)
  • Feature RTC DS3231 on I2C protocol
  • MicroSD card slot
  • Header row for stacking FeatherWing with same power control
Update from Version 1:
  • Bug fixed from Version 1
  • 2 LEDs with current limiting resistors
  • RTC is now powered from 3V3 instead of Vbat (using power from Vbat turns on Feather Battery Charger LED)
  • Pull up resistor for SD chip select just like adalogger
  • Rounded PCB corner
  • Move the reset button to the middle of the board - mechanically more stable
  • Add solder jumper for RTC-INT, normally connected
  • Use all logic MOSFET instead of one BJT for higher voltage signal control

Note: the LEDs are lower power (rated at 2mA instead of 20mA)

Files

OPEnSLab-OSU/OPEnS-Hypnos-V2.zip

Files (1.4 MB)

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