EnviroDIY Mayfly Logger: v0.5b

New features of version 0.5b (released in May 2017):

• Added additional power options for the XBee radio socket, via jumper SJ13, to optionally power newer radios (i.e. 4G LTE-M & NBIoT) that require up to 2A of power at ~3.7V and do not have an external JST power socket. The SJ13 jumper on the back of the Mayfly Logger v0.5b allows the user to chose to power the XBee radio module from either the:
  • Mayfly’s regulated 3.3v Vcc line (default), with a 500 mA maximum; or
  • LiPo battery unregulated direct power (option), if you cut the small trace that’s connecting the “3v3” pad to the center pad of SJ13 (labeled “BEE_Vcc”), and put a solder bridge joining “BEE_Vcc” to the pad labeled “LIPO”

EnviroDIY Mayfly Logger: v0.5

New features of version 0.5 (released in March 2017):

• Separate 3.3v regulator on the Switched3.3v bus (makes the board more stable when switching loads on and off, and increase current output available to the load with a max output of 500ma)
• New 5v-boost regulator (SC4503 replaces the obsolete NCP1402)
• Onboard pullup resistor (1M ohm) available via jumper SJ12 for connecting D10 to the pullup (useful for using D10 as a hardware interrupt)
• External voltage input range improved – now accepts 4 to 12v.
  • A small slide switch on the top of the board allows you to select the usual USB/Lipo power option, or you can select an external voltage source to power the board. To prevent over-voltage damage, the USB port is disconnected from the Mayfly when the switch is set to “Ext”. If you are using the Mayfly with an external battery and then want to reprogram the Mayfly, you’ll need to slide the switch to “USB/Lipo” in order to program the board. Then slide it back to “Ext” to power the board via your external source. If you have a Lipo battery connected to the “Lipo Batt” JST headers, be sure to keep the slide switch in the “USB/Lipo” position or the board will not be powered.