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Will the propeller pins handle 3.7v? — Parallax Forums

Will the propeller pins handle 3.7v?

grimmgrimm Posts: 14
edited 2015-02-14 12:18 in Propeller 1
I'm hooking the propeller up to a Adafruit power boost 1000 breakout board. It has a nice low power pin that is initially set high to the battery voltage, in my case a LiPo 3.7v battery. Once the battery voltage falls to 3.2 volts the pin is set low. Will hooking this pin up to the propeller cause problems? Should I put a resistor in series with it? Thanks,

Jason

https://learn.adafruit.com/adafruit-powerboost-1000-basic

Comments

  • grimmgrimm Posts: 14
    edited 2015-02-14 01:14
    I just measured the voltage with a fully charged battery and it's almost 4v, so I'm thinking that it's too high for the Propeller to handle?
  • Peter JakackiPeter Jakacki Posts: 10,193
    edited 2015-02-14 02:13
    grimm wrote: »
    I'm hooking the propeller up to a Adafruit power boost 1000 breakout board. It has a nice low power pin that is initially set high to the battery voltage, in my case a LiPo 3.7v battery. Once the battery voltage falls to 3.2 volts the pin is set low. Will hooking this pin up to the propeller cause problems? Should I put a resistor in series with it? Thanks,

    Jason

    https://learn.adafruit.com/adafruit-powerboost-1000-basic

    Just use a series resistor of around 100k into the Prop pin as you don't want to affect the base of the digital PNP on that board. It's a matter of limiting current that's all and in this case not affecting the PNP that drives the LBO LED.

    Though I'm wondering why you need to boost a 3.7V battery up to 5.2V to drop it back down to 3.3V unless of course you need 5V elsewhere.
  • grimmgrimm Posts: 14
    edited 2015-02-14 12:18
    Excellent! Thanks, yep I'm also powering a Raspberry Pi and some 5v sensors. :D

    Jason
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