Espressif ESP32-LyraT, Docs Template Documentation

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I2C Header / JP5
I2C Header Pin ESP32 Pin
1 SCL GPIO23
2 SDA GPIO18
3 GND GND
JTAG Header / JP7
ESP32 Pin JTAG Signal
1 MTDO / GPIO15 TDO
2 MTCK / GPIO13 TCK
3 MTDI / GPIO12 TDI
4 MTMS / GPIO14 TMS
Function DIP Switch / JP8
Switch OFF Switch ON
1 GPIO12 not allocated MicroSD Card 4-wire
2 Touch Vol- enabled MicroSD Card 4-wire
3 MicroSD Card JTAG
4 MicroSD Card JTAG
5 MicroSD Card JTAG
6 MicroSD Card JTAG
7 MicroSD Card 4-wire AUX IN detect
1
8 not used not used
1. The AUX Input signal pin should not be plugged in when the system powers up. Otherwise the ESP32 may not
be able to boot correctly.
Start Application Development
Before powering up the ESP32-LyraT, please make sure that the board has been received in good condition with no
obvious signs of damage.
Initial Setup
Prepare the board for loading of the first sample application:
1. Connect 4-ohm speakers to the Right and Left Speaker Output . Optionally connect headphones to the Head-
phone Output .
2. Plug in the Micro-USB cable to the PC and to the Micro USB Port of the ESP32-LyraT.
3. The Standby LED (green) should turn on. Assuming that a battery is not connected, the Charging LED will
momentarily blink every couple of seconds.
4. Toggle left the Power On Switch .
1.10. Related Documents 25