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June 19, 2013
about 5 years ago
I also had this experience and asked Microchip.
This is their answer:
By default, wiring the module with VCC, GND, TXD and RXD the sleep command will cause the current to drop down to around 330uA.
To lower the power, GPIO4, 5, 6, 7, 8 need a 100k pull down. The resistors on board are not pull downs. They are used for setting the pinout configuration. Other than this as long as the UART IO lines are kept low in sleep mode the current consumption should be low too.
I connected my unused outputs GPIO-5, 7 and 8 (4 is green led) directly to groud, and measure 3,6 uA in sleep mode.
I use this modules for home automation and alarm purposes.
In the past I used Z-Wave and XBee, but now I changed to Wifly because these modules are so easy to use and operate very reliable.
Because it is just Wifi, you can use all the tools you are used to.
If you are interested, I created a completely wireless motion sensor with this module.
It uses a 1 cel Lipo battery together with the LiPower - Boost Converter for a solid power source.
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