TTGO T7 V1.3 Mini32

by LilyGo

Compact ESP32 dev board with auto-reset and USB - ideal for space-saving Wi-Fi/BLE applications.

Micro-USB

Buy · $5.49 Pinout

ESP32

MCU

240MHz

clock

4MB

flash

520KB

SRAM

32· 12 ADC

GPIO

BLE 4.2+ WiFi

radio

Pinout

40 pins

View:

Pin	GPIO	Labels	Status	Capabilities	Notes
1	-	RST	control	-	Reset (chip enable, active low)
2	36	VPGPIO36	strapping	adc	ADC1_CH0, input only
3	26	26GPIO26	safe	adc · dac	DAC2, ADC2_CH9
4	18	18GPIO18	safe	spi	VSPI SCK
5	19	19GPIO19	safe	spi	VSPI MISO
6	23	23GPIO23	safe	spi	VSPI MOSI
7	5	5GPIO5	strapping	spi	VSPI CS
8	-	3V33.3V	power	-	3.3V regulated output
9	13	TCKGPIO13	strapping	-	JTAG TCK (MTCK)
10	10	SD3GPIO10	strapping	-	Flash pin - do not use
11	-	GND	ground	-	Ground
12	-	NC	safe	-	Not connected
13	39	VNGPIO39	strapping	adc	ADC1_CH3, input only
14	35	35GPIO35	strapping	adc	ADC1_CH7, input only
15	33	33GPIO33	safe	adc · touch	ADC1_CH5, Touch8
16	34	34GPIO34	strapping	adc	ADC1_CH6, input only
17	14	TMSGPIO14	strapping	-	JTAG TMS (MTMS)
18	-	NC	safe	-	Not connected
19	9	SD2GPIO9	strapping	-	Flash pin - do not use
20	11	CMDGPIO11	strapping	-	Flash pin - do not use
21	1	TX0GPIO1	uart	uart	UART0 TX (USB serial)
22	3	RX0GPIO3	uart	uart	UART0 RX (USB serial)
23	22	22GPIO22LED_BUILTIN	safe	i2c	Default I2C SCL; onboard LED (LED_BUILTIN)
24	21	21GPIO21	safe	i2c	Default I2C SDA
25	17	17GPIO17	strapping	-	General-purpose IO
26	16	16GPIO16	strapping	-	General-purpose IO
27	-	GND	ground	-	Ground
28	-	5V	power	-	5V from USB, input to onboard regulator
29	15	TDOGPIO15	strapping	-	JTAG TDO (MTDO)
30	7	SD0GPIO7	strapping	-	Flash pin - do not use
31	-	GND	ground	-	Ground
32	27	27GPIO27	safe	adc · touch	ADC2_CH7, Touch7
33	25	25GPIO25	safe	adc · dac	DAC1, ADC2_CH8
34	32	32GPIO32	safe	adc · touch	ADC1_CH4, Touch9
35	12	TDIGPIO12	strapping	-	JTAG TDI (MTDI)
36	4	4GPIO4	strapping	adc · touch	ADC2_CH0, Touch0
37	0	0GPIO0	strapping	adc · touch	ADC2_CH1, Touch1, Boot button
38	2	2GPIO2	strapping	adc · touch	ADC2_CH2, Touch2
39	8	SD1GPIO8	strapping	-	Flash pin - do not use
40	6	CLKGPIO6	strapping	-	Flash pin - do not use

Start with these

10 pins with no boot or system involvement

26GPIO2618GPIO1819GPIO1923GPIO2333GPIO3322GPIO2221GPIO2127GPIO2725GPIO2532GPIO32

Freely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.

Fine - with a little care

sampled at boot or shared with debug/serial

Pin	Label	What to know	Role
VP	GPIO36 (SENSOR_VP)	Cannot be used as output; only suitable for input (e.g., analog read).	Other
5	GPIO5	Must be HIGH during boot; if pulled LOW at reset, alters SDIO slave timing and may prevent normal boot.	Strapping
TCK	MTCK (GPIO13)	Used for JTAG debugging (TCK); avoid using as GPIO if JTAG is needed.	Other
VN	GPIO39 (SENSOR_VN)	Cannot be used as output; only suitable for input.	Other
35	GPIO35	Cannot be used as output; only suitable for input.	Other
34	GPIO34	Cannot be used as output (no drive capability); only suitable for analog/digital input.	Other
TMS	MTMS (GPIO14)	Used for JTAG debugging (TMS); driving it as GPIO may interfere with JTAG or produce spurious signals at boot.	Other
TDO	MTDO (GPIO15)	Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change.	Strapping
TDI	MTDI (GPIO12)	Keep LOW during boot (internal PD); pulling HIGH at reset selects 1.8V flash mode, causing flash brownout if 3.3V flash is used.	Strapping
4	GPIO4	Sampled at reset for boot config; should not be driven at boot (affects boot mode timing).	Strapping
0	GPIO0	Must be HIGH during boot for normal startup; if held LOW on reset, forces flash programming mode.	Strapping
2	GPIO2	If driven HIGH on reset (while IO0 is LOW), selects an unsupported SDIO boot mode, causing boot failure.	Strapping

Only if you know the tricks

wired to flash or USB - expect a fight

Pin	Label	What to know	Role
SD3	GPIO10 (Flash SD3)	Used by internal flash/PSRAM; typically not exposed on modules, avoid using as GPIO.	Flash
SD2	GPIO9 (Flash SD2)	Used by internal flash/PSRAM; typically not exposed on modules, avoid using as GPIO.	Flash
CMD	GPIO11 (Flash CMD)	Used by internal flash (chip select/command); not available for general use.	Flash
TX0	U0TXD (GPIO1)	Connected to on-board USB-UART for uploading and logs; drives serial output at boot, so using as GPIO can disrupt programming or console.	USB
RX0	U0RXD (GPIO3)	Used for receiving data from USB-UART (programming); also pulled HIGH at boot for console communication, so using as GPIO can disrupt uploads.	USB
17	GPIO17	Connected to internal PSRAM on PSRAM-enabled modules; not usable as GPIO on those modules.	Flash
16	GPIO16	Connected to internal PSRAM on PSRAM-enabled modules; not usable as GPIO on those modules.	Flash
SD0	GPIO7 (Flash SD0)	Used for internal flash/PSRAM data; not available for general GPIO.	Flash
SD1	GPIO8 (Flash SD1)	Used for internal flash/PSRAM data; not available for general GPIO.	Flash
CLK	GPIO6 (Flash SCK)	Used for internal flash/PSRAM communication; not available for general GPIO.	Flash

These are recommendations, not hard rules - with the right pull-ups, timing and boot-state awareness most pins can be made to work. When in doubt, start green.

Pinout notes The TTGO T7 V1.3 Mini32 breaks out 40 pins in total: 32 GPIO for your project, with 3V3 , GND and 5V handling power. On the analog side there are 12…

The TTGO T7 V1.3 Mini32 breaks out 40 pins in total: 32 GPIO for your project, with 3V3, GND and 5V handling power.

On the analog side there are 12 ADC-capable pins for sensors and battery monitoring, 6 capacitive-touch inputs and 2 true DAC outputs.

If you want zero surprises, 26, 18, 19, 23 and 6 more are free of any such role - the safest first picks. 12 of the exposed pins carry boot-time or system duties on the ESP32 (VP, 5, TCK and 9 more).

Getting started

flash your first firmware in ~2 minutes

Tool:

Connect over USB

Install your USB-serial driver (CH340 / CP210x) if no port appears. Not detected? Hold BOOT while plugging in.

Match & flash

Set the Tools options shown, then click Upload.

Verify it runs

The onboard LED on GPIO26 blinks - swap the pin if your board's LED differs.

Set these in Tools · leave everything else at default

Arduino IDE 2.x — Tools Copy

Board: "ESP32 Dev Module"▸

Flash Size: "4MB (32Mb)"▸

Flash Mode: "DIO"▸

Partition Scheme: "Default 4MB with spiffs (1.2MB APP / 1.5MB SPIFFS)" (default)▸

Upload Speed: "921600"▸

▸ every other Tools option — leave at default

Board: ESP32 Dev Module
Flash Size: 4MB (32Mb)
Flash Mode: DIO
Partition Scheme: Default 4MB with spiffs (1.2MB APP / 1.5MB SPIFFS)
Upload Speed: 921600

Find it: Tools ▸ Board ▸ ESP32 Arduino ▸ ESP32 Dev Module

blink.ino Copy

// blink the onboard LED
void setup() {
  pinMode(26, OUTPUT);
}
void loop() {
  digitalWrite(26, HIGH); delay(500);
  digitalWrite(26, LOW);  delay(500);
}

board to selectesp32dev⧉ copy

platformio.ini Copy

[env:ttgo-t7-v13-mini32]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
upload_speed = 921600

Find it: PlatformIO Home ▸ Boards, search esp32dev — or type it after board =.

board to selectesp32dev⧉ copy

device.yaml Copy

esp32:
  board: esp32dev
  variant: ttgo-t7-v13-mini32
  framework:
    type: esp-idf

# blink - GPIO26
output:
  - platform: gpio
    pin: 26
    id: led_out
light:
  - platform: binary
    name: "LED"
    output: led_out

Find it: search ESPHome's board list for esp32dev (same ids as PlatformIO).

esptool doesn't pick board settings — a prebuilt .bin already has them baked in. This is just the raw flash command.

terminal Copy

esptool.py --chip esp32 --port /dev/ttyACM0 \
  --baud 921600 write_flash 0x0 firmware.bin

--port = your /dev/tty* (macOS/Linux) or COMx (Windows).

Build details: sketch space 1310720 B · data 327680 B · DIO

Specifications

ESP32

Compute

MCU

ESP32

Clock

240 MHz

SRAM · Flash

520 KB · 4MB

Radio

Wi-Fi

802.11 b/g/n

Bluetooth

4.2 LE

Antenna

PCB

I/O

GPIO · ADC

32 · 12

UART · I²C · SPI

3 · 2 · 4

PWM

16 channels

Power

USB

Micro-USB

Serial

CH340C

Boot address

0x1000

Flashing

Upload · OTA

esptool_py · esp_ota

Flash · Boot mode

DIO · DIO

Sketch · Data

1.25 MB · 320 KB

The TTGO T7 V1.3 Mini32 uses esptool_py for firmware uploads, esp_ota for over-the-air (OTA) updates. Flash mode is DIO with DIO boot mode. The maximum sketch size is 1.25 MB with 320 KB available for data.

About this board

At its core is the ESP32 - a dual-core Xtensa with both Bluetooth Classic and BLE.

Expect to pay about $5.49 - less than the ~$20 most ESP32 boards go for.

32 GPIO are broken out - more than most ESP32 boards, so the pin budget is rarely the constraint.

Onboard you'll find battery charging (TP4054) via JST 1.25mm and Reset/Boot buttons.

Onboard ON/OFF power slide switch
u.FL/IPEX socket for an external antenna (ships with onboard PCB antenna; move the SMT jumper to switch)

Where to buy

prices are typical street prices

TTGO T7 V1.3 Mini32

$5.49per unit, typical

Resources

ESP32 datasheet espressif.com↗ LilyGo T7 V1.3 Mini32 product page lilygo.cc↗LilyGo ESP32-MINI-32 GitHub repository github.com↗TTGO T7 V1.3 Mini32 - PlatformIO board reference docs.platformio.org↗

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