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Datasheet for the onboard switch - we parallel-connected both switches
The SIM808 with Leonardo mainboard is the latest Arduino board developed by DFRobot for multi-purpose applications
but we expect it to work just fine with any modern computer as this chipset is very common
SPI chip select connected to any available GPIO by putting a simple solder bridge
There are two standard prototyping platforms: Breadboards and Perfboards
SparkFun Barrel Jack to 2-pin JST Adapter Cable Pogo Pins "Spear Head" (10 pack) - P75-LM3 Datasheet for the onboard switchTwo pin JST connector to a 2. 1x 5. 5mm barrel jack, 6. 25 inch long jumper cable. We use this cable to adapt from a wall power supply to a relatively small, SMD JST connector. We found that many of the SMD connectors used for battery charging were too large or were not capable of through putting the current we wanted for faster charging. This setup, with a SMD JST connector and wall power supply, can handle up to 2A!
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