TTGO Koala Board

The TTGO T-Koala ESP32 board offers an good breadboard for development of ESP32 based solutions with battery powering.

There is a version of the board available that is based on the ESP32-WROOM-32 module. The difference is the PSRAM that is not available in the WROOM module

This board is equipped with:

ESP ESP32 Wrover-B module
3.7V battery charging circuit
Supply voltage: 3.3V DC or 5V DC
Flash memory: 4MByte in QIO Mode
SRAM: 520KB
PSRAM: 8MB, integrated in the Wrover module
PCB dimensions: 51.4 x 25.2mm
Momentary button for RST
JST Connector: 2Pin 1.25mmx
USB: Type-C connector
USB-Bridge: CH340C chip
LiPo Connector: JST-PH 2.0, 2 pins
LiPo Loading Control chip TP4054
3 LEDS (see below)

There is a 3-pin connector to add a power switch. This allows for swithing a battery powered device on/off without detaching the LiPo.

To use the connector the nearby 0-Ohm resistor must be desoldered.

LEDs

There are 3 LEDs on the board.

Red LED is Power
Blue LED is charging indicator
Green LED can be switched on / off by the GPIO5 pin.
PIN 25
PIN 35

(Noch nicht ganz sicher) * 25 Nicht nutzbar wegen PSRam 16/17

SDA/SCL 21/22

alt text

LEDs

IO5 : GREEN LED

Blue LED: LiPo charge chip TP4054

RED LED: 3.3V Power

Example env.json Device Configuration

{
  "device": {
    "0": {
      "name": "tkoala",
      "title": "T-Koala",
      "description": "LilyGO TTGO T-Koala",
      "safemode": "false",
      "homepage": "/index.htm",
      "cache": "etag"
    }
  },
  "ota": {
    "0": {}
  },
  "diag": {
    "0": {}
  },
  "digitalout": {
    "led": {
      "title": "green led",
      "description": "onboard green led",
      "loglevel": "0",
      "pin": "5",
      "value": "0"
    }
  }
}

{
  "switch": {
    "led": {
      "onvalue": "digitalout/led?value=$v",
      "title": "switch/led"
    }
  }
}

TTGO Koala Board

LEDs

LEDs

Example env.json Device Configuration

See also

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