SPK± is a differential speaker interface. You can connect an external electret microphone to these two pins directly. Pulling it LOW for approximately 50 ms will wake up the module. Pulling it HIGH causes the module to enter sleep mode, disabling serial communication. It is by default HIGH and can be configured to go LOW when a call or SMS is received.ĭTR pin controls the sleep mode. This is basically the ‘interrupt-out’ pin from the module. TxD (Transmitter) pin transmits data from the module to the microcontroller. This pin is auto-baud so the baud rate at which you send the “AT” command after reset is the baud rate used. RxD (Receiver) pin is used to send commands to the module. If you got the module in an absolutely bad space, pull this pin LOW for 100ms to perform a hard reset. It doesn’t even run on 3.3 V! Use a Li-Po battery or a DC-DC buck converter instead. Keep in mind that the SIM800L chip has an operating voltage range of 3.4 V to 4.4 V, so connecting this module to the Arduino’s 5V output is probably going to cause damage to the module. We have created some helper functions for you in our TinyPICO MicroPython & Arduino helper libraries to make this easy. Please check the code in the platform you use to understand how to shut down the APA102 correctly as just pulling GPIO13 high is not enough.NET pin is where you can solder the helical antenna that comes with the module.
It’s essential to do this before going into deep sleep to ensure the lowest current draw possible. GPIO13 controls the power to the APA102 using a P-Channel MOSFET via a high-side switch that can (along with smoother IO settings) shut down the power to the APA102 for you. Thankfully we have a solution for deep sleep. Note: TinyPICO includes an on-board APA102 RGB LED that has a quiescent current of 1 mA.
In-fact, even the power & charge LEDs are shutdown when no 5 V power source is present.ĭeep sleep has been optimised for all development platforms, and though we have seen it go as low as 10 uA, our official current rating in deep sleep is 20 uA. Any components that are not needed for operation via battery or via the 3.3 V power pin are isolated within the 5 V power path, and are totally shut down when no USB cable is plugged in. TinyPICO has been designed with two isolated power paths: a 5 V path and a 3.3 V path. Optimised Power Paths & Deep Sleep Current
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