Fig. 4 · Espressif

ESP32-DevKitC V4

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Espressif's own ESP32 board: two cores, Wi-Fi and Bluetooth, 3.3 V logic.

Lessons 0/5Assembly not done

Each lesson runs your own code on the board. Finish its checks to tick it off.

A breadboard-friendly board from Espressif. The ESP32-WROOM-32E module at the top holds a dual-core Xtensa LX6 chip at up to 240 MHz, 4 MB of flash and a 40 MHz crystal under a metal shield, with a printed antenna that hangs 6 mm over the edge so no copper sits under it. Below it are a micro-USB socket, a CP2102N USB-to-serial bridge, an AMS1117 3.3 V regulator, a red power LED and two buttons: EN resets the chip, Boot holds GPIO0 low. There is no user LED, so the lessons wire one to GPIO23. Every I/O pin is 3.3 V and none of them tolerate 5 V.

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Every header pin of the ESP32-DevKitC V4
Header	Pin	Name	Functions	Level	Max current	Notes
J2	1	3V3	3.3 V supply	3.3 V	–	Regulator output. Draw a little current for sensors here, or feed 3.0 to 3.6 V in when nothing else powers the board.
J2	2	EN	CHIP_PU, reset	3.3 V	–	CHIP_PU. Pulled up by 10 kΩ with a 100 nF delay capacitor; pulling it low (or pressing EN) holds the chip in reset.
J2	3	VP	GPIO36, ADC1_CH0, SENSOR_VP, Input only	3.3 V	–	GPIO36, input only: no output driver and no internal pull-up or pull-down. ADC1, so it reads analog values even while Wi-Fi runs.
J2	4	VN	GPIO39, ADC1_CH3, SENSOR_VN, Input only	3.3 V	–	GPIO39, input only, no internal pulls. ADC1 channel 3.
J2	5	34	GPIO34, ADC1_CH6, VDET_1, Input only	3.3 V	–	Input only, no internal pulls: add your own resistor for a button. ADC1, the safe choice for a potentiometer or sensor when Wi-Fi is on.
J2	6	35	GPIO35, ADC1_CH7, VDET_2, Input only	3.3 V	–	Input only, no internal pulls: add your own resistor for a button. ADC1, the safe choice for a potentiometer or sensor when Wi-Fi is on.
J2	7	32	GPIO32, ADC1_CH4, TOUCH9, XTAL_32K_P	3.3 V	40 mA	ADC1 and a touch channel; it can also take a 32 kHz watch crystal. A good general-purpose pin.
J2	8	33	GPIO33, ADC1_CH5, TOUCH8, XTAL_32K_N	3.3 V	40 mA	ADC1 and a touch channel; it can also take a 32 kHz watch crystal. A good general-purpose pin.
J2	9	25	GPIO25, ADC2_CH8, DAC_1	3.3 V	40 mA	One of the two 8-bit DAC outputs (dacWrite gives 0 to about 3.3 V). Also ADC2, which stops working while Wi-Fi is on.
J2	10	26	GPIO26, ADC2_CH9, DAC_2	3.3 V	40 mA	One of the two 8-bit DAC outputs (dacWrite gives 0 to about 3.3 V). Also ADC2, which stops working while Wi-Fi is on.
J2	11	27	GPIO27, ADC2_CH7, TOUCH7	3.3 V	40 mA	ADC2 and a touch channel. analogRead() fails here once Wi-Fi is running; use an ADC1 pin (32 to 39) for analog input then.
J2	12	14	GPIO14, ADC2_CH6, TOUCH6, MTMS	3.3 V	40 mA	JTAG TMS. It outputs a brief signal during boot (reported by secondary sources), so avoid it for things that must stay off at power-up.
J2	13	12	GPIO12, ADC2_CH5, TOUCH5, MTDI, Strapping pin	3.3 V	40 mA	Strapping pin MTDI: it must be LOW at reset. Pulled high, it sets the flash supply to 1.8 V and the board boot-loops with "flash read err, 1000". Keep pull-ups and sensors that idle high off this pin.
J2	14	GND	ground	–	–
J2	15	13	GPIO13, ADC2_CH4, TOUCH4, MTCK	3.3 V	40 mA	ADC2 and a touch channel. analogRead() fails here once Wi-Fi is running; use an ADC1 pin (32 to 39) for analog input then.
J2	16	D2	flash SD2 (GPIO9) on the older WROOM-32	–	–	On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.
J2	17	D3	flash SD3 (GPIO10) on the older WROOM-32	–	–	On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.
J2	18	CMD	flash CMD (GPIO11) on the older WROOM-32	–	–	On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.
J2	19	5V	5 V supply (EXT_5V)	5 V	–	The 5V rail: USB 5 V after the Schottky diode, or a 5 V input. No reverse-polarity protection and no fuse on this pin.
J3	1	GND	ground	–	–
J3	2	23	GPIO23, VSPI MOSI	3.3 V	40 mA	VSPI MOSI and a plain output that is not a strapping pin, so it is the safe pin for the lessons' LED.
J3	3	22	GPIO22, I2C SCL	3.3 V	40 mA	Arduino's default I²C SCL (and GPIO21 is SDA). Add 4.7 kΩ pull-ups to 3V3 if the module has none.
J3	4	TX	GPIO1, U0TXD	3.3 V	40 mA	UART0, wired through a 0 Ω link to the USB bridge. The boot log and Serial print here at 115200 baud; leave TX and RX free if you want uploads and the serial monitor.
J3	5	RX	GPIO3, U0RXD	3.3 V	40 mA	UART0, wired through a 0 Ω link to the USB bridge. The boot log and Serial print here at 115200 baud; leave TX and RX free if you want uploads and the serial monitor.
J3	6	21	GPIO21, I2C SDA	3.3 V	40 mA	Arduino's default I²C SCL (and GPIO21 is SDA). Add 4.7 kΩ pull-ups to 3V3 if the module has none.
J3	7	GND	ground	–	–
J3	8	19	GPIO19, VSPI MISO	3.3 V	40 mA
J3	9	18	GPIO18, VSPI SCK	3.3 V	40 mA
J3	10	5	GPIO5, VSPI SS, Strapping pin	3.3 V	40 mA	Strapping pin (SDIO timing), pulled up inside; it outputs a brief signal at boot. Fine as SPI chip-select.
J3	11	17	GPIO17, U2TXD	3.3 V	20 mA	UART2 TX (GPIO16 is RX). These two pads sit on the flash supply domain and source about 20 mA, not 40. On WROVER boards they belong to the PSRAM.
J3	12	16	GPIO16, U2RXD	3.3 V	20 mA	UART2 TX (GPIO16 is RX). These two pads sit on the flash supply domain and source about 20 mA, not 40. On WROVER boards they belong to the PSRAM.
J3	13	4	GPIO4, ADC2_CH0, TOUCH0	3.3 V	40 mA	Touch channel T0, used by the touch lesson. Also ADC2.
J3	14	0	GPIO0, ADC2_CH1, TOUCH1, Boot, Strapping pin	3.3 V	40 mA	Strapping pin wired to the Boot button: LOW at reset starts the serial downloader instead of your sketch. After boot it works as an input with INPUT_PULLUP (pressed = LOW).
J3	15	2	GPIO2, ADC2_CH2, TOUCH2, Strapping pin	3.3 V	40 mA	Strapping pin with an internal pull-down: it must be low or floating to enter download mode. An LED with its resistor to GND is harmless, a pull-up is not.
J3	16	15	GPIO15, ADC2_CH3, TOUCH3, MTDO, Strapping pin	3.3 V	40 mA	Strapping pin MTDO, pulled up: held LOW at reset it silences the ROM boot log on TX. Also JTAG TDO.
J3	17	D1	flash SD1 (GPIO8) on the older WROOM-32	–	–	On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.
J3	18	D0	flash SD0 (GPIO7) on the older WROOM-32	–	–	On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.
J3	19	CLK	flash CLK (GPIO6) on the older WROOM-32	–	–	On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.

Sensors and actuators this board drives, with the real connections.

LEDSupply 3.3 V
Anode through 220 to 330 Ω to GPIO23, cathode to GND: about 4 to 6 mA from 3.3 V. Any non-strapping output pin works.
Part pin Board pin
A (through 220 Ω) 23Wire colour orange
K GNDWire colour black
Push buttonSupply 3.3 V
One side to GPIO4, the other to GND, with pinMode(4, INPUT_PULLUP); pressed reads LOW. On GPIO34 to 39 there is no internal pull-up, so add a 10 kΩ resistor to 3V3.
Part pin Board pin
1 4Wire colour yellow
3 GNDWire colour black
PotentiometerSupply 3.3 V
Ends to GND and 3V3, wiper to GPIO34. analogRead(34) gives 0 to 4095 and analogReadMilliVolts(34) gives millivolts; the reading bends near both ends.
Part pin Board pin
1 GNDWire colour black
2 34Wire colour yellow
3 3V3Wire colour red
Careful
Feed the pot from 3V3, never 5V. Use an ADC1 pin (32 to 39): ADC2 pins stop reading once Wi-Fi starts.
TMP36 temperature sensorSupply 3.3 V
+Vs to 3V3 (it runs from 2.7 V), Vout to GPIO35, GND to GND. Temperature is (mV − 500) ÷ 10 °C.
Part pin Board pin
+Vs 3V3Wire colour red
Vout 35Wire colour yellow
GND GNDWire colour black
HC-SR04 ultrasonic sensorSupply 5 V
VCC to 5V, Trig to GPIO18; the board's 3.3 V trigger is high enough for the sensor. Distance in cm is the echo time in µs ÷ 58.
Part pin Board pin
VCC 5VWire colour red
Trig 18Wire colour orange
Echo (through a 1 kΩ / 2 kΩ divider) 19Wire colour green
Gnd GNDWire colour black
Careful
Echo is a 5 V output. Run it through a divider (1 kΩ from Echo, 2 kΩ to GND, the middle to GPIO19) so the pin sees about 3.3 V. Straight into a GPIO it drives current through the clamp diodes and can kill the pin.
SG90 micro servoSupply 5 V
Brown to GND, red to 5V, orange (signal) to GPIO13, driven with a servo library at 50 Hz, 500 to 2400 µs.
Part pin Board pin
brown GNDWire colour brown
red 5VWire colour red
orange 13Wire colour orange
Careful
A moving SG90 draws 100 to 250 mA and up to about 700 mA when stalled. From USB that browns out the board; give servos their own 5 V supply and join the grounds.
MPU-6050 IMUSupply 3.3 V
VCC to 3V3, GND to GND, SCL to GPIO22, SDA to GPIO21. Wire.begin() uses those pins by default; the address is 0x68.
Part pin Board pin
VCC 3V3Wire colour red
GND GNDWire colour black
SCL 22Wire colour yellow
SDA 21Wire colour blue
SSD1306 OLED displaySupply 3.3 V
GND, VCC (3V3), SCL to GPIO22, SDA to GPIO21. The display answers at 0x3C.
Part pin Board pin
GND GNDWire colour black
VCC 3V3Wire colour red
SCL 22Wire colour yellow
SDA 21Wire colour blue
Careful
The pin order differs between makers (some put VCC first): read the labels on your module before you plug it in.

Part pin	Board pin
A (through 220 Ω)	23Wire colour orange
K	GNDWire colour black

Part pin	Board pin
1	4Wire colour yellow
3	GNDWire colour black

Part pin	Board pin
1	GNDWire colour black
2	34Wire colour yellow
3	3V3Wire colour red

Part pin	Board pin
+Vs	3V3Wire colour red
Vout	35Wire colour yellow
GND	GNDWire colour black

Part pin	Board pin
VCC	5VWire colour red
Trig	18Wire colour orange
Echo (through a 1 kΩ / 2 kΩ divider)	19Wire colour green
Gnd	GNDWire colour black

Part pin	Board pin
brown	GNDWire colour brown
red	5VWire colour red
orange	13Wire colour orange

Part pin	Board pin
VCC	3V3Wire colour red
GND	GNDWire colour black
SCL	22Wire colour yellow
SDA	21Wire colour blue

Part pin	Board pin
GND	GNDWire colour black
VCC	3V3Wire colour red
SCL	22Wire colour yellow
SDA	21Wire colour blue

Power inputs

Micro-USB cable (4.75 V)4.75–5.25 Vrecommended 4.75–5.25 Vup to 500 mAReverse-polarity protectedVBUS goes through the BAT760 Schottky diode (D3) to the 5V rail, so a supply on the 5V pin cannot push current back into the computer. An ESD diode (D5) guards VBUS. There is no fuse: the computer's USB port limit (500 mA) and the regulator's own current limit are the only protection. The diode drops about 0.35 V, so the 5V rail sits near 4.65 V on USB.
Supply on a header pin (4.75 V)4.75–5.25 Vrecommended 4.75–5.25 VNo reverse-polarity protectionNone. The 5V pin is wired straight to the 5V rail after D3, with no diode and no fuse. A reversed supply here finds a path through D3 and the ESD diode and drags 3V3 below ground through the regulator. The regulator itself survives up to 15 V, but the 22 µF input capacitor is rated 10 V, and anything above about 6 V makes the regulator burn the difference as heat. Use one supply at a time: Espressif warns that two at once can damage the board or the supply.
Supply on a header pin (3.3 V)3–3.6 Vrecommended 3.3–3.3 VNo reverse-polarity protectionNone. A supply on the 3V3 pin feeds the module directly and skips the regulator, so it must stay between 3.0 V and 3.6 V. 5 V here kills the ESP32 and its flash. Never connect it while USB is plugged in: it back-feeds the regulator's output.

Rails

5V · 5 VEXT_5V: USB through the Schottky diode (about 4.65 V) or the 5V pin. It feeds the regulator and the red power LED.
3V3 · 3.3 V · up to 1,000 mAVDD33 from the AMS1117-3.3 (1 A rated, current limit 0.9 to 1.5 A, dropout about 1.1 V). It powers the module and the CP2102N. The module needs at least 500 mA available, because Wi-Fi transmit bursts reach about 240 to 380 mA.

Pin current

20 mA per pin
40 mA absolute maximum
1,200 mA for all pins together
Resets below 2.43 V
Draws about 50 mA idle
Each GPIO sources about 20 mA at the default drive strength and up to 40 mA at the highest setting, and sinks up to 28 mA. Keep a pin under 12 mA in practice and use 220 to 330 Ω for an LED. All the pins together may carry 1200 mA at most, though the regulator and the USB port run out long before that. A HIGH input needs at least 2.5 V (0.75 × 3.3 V); nothing above 3.6 V may touch a pin.

Header

Name

Functions

Level

Max current

Notes

3V3

3.3 V supply

3.3 V

–

Regulator output. Draw a little current for sensors here, or feed 3.0 to 3.6 V in when nothing else powers the board.

CHIP_PU, reset

3.3 V

–

CHIP_PU. Pulled up by 10 kΩ with a 100 nF delay capacitor; pulling it low (or pressing EN) holds the chip in reset.

GPIO36, ADC1_CH0, SENSOR_VP, Input only

3.3 V

–

GPIO36, input only: no output driver and no internal pull-up or pull-down. ADC1, so it reads analog values even while Wi-Fi runs.

GPIO39, ADC1_CH3, SENSOR_VN, Input only

3.3 V

–

GPIO39, input only, no internal pulls. ADC1 channel 3.

GPIO34, ADC1_CH6, VDET_1, Input only

3.3 V

–

Input only, no internal pulls: add your own resistor for a button. ADC1, the safe choice for a potentiometer or sensor when Wi-Fi is on.

GPIO35, ADC1_CH7, VDET_2, Input only

3.3 V

–

Input only, no internal pulls: add your own resistor for a button. ADC1, the safe choice for a potentiometer or sensor when Wi-Fi is on.

GPIO32, ADC1_CH4, TOUCH9, XTAL_32K_P

3.3 V

40 mA

ADC1 and a touch channel; it can also take a 32 kHz watch crystal. A good general-purpose pin.

GPIO33, ADC1_CH5, TOUCH8, XTAL_32K_N

3.3 V

40 mA

ADC1 and a touch channel; it can also take a 32 kHz watch crystal. A good general-purpose pin.

GPIO25, ADC2_CH8, DAC_1

3.3 V

40 mA

One of the two 8-bit DAC outputs (dacWrite gives 0 to about 3.3 V). Also ADC2, which stops working while Wi-Fi is on.

GPIO26, ADC2_CH9, DAC_2

3.3 V

40 mA

One of the two 8-bit DAC outputs (dacWrite gives 0 to about 3.3 V). Also ADC2, which stops working while Wi-Fi is on.

GPIO27, ADC2_CH7, TOUCH7

3.3 V

40 mA

ADC2 and a touch channel. analogRead() fails here once Wi-Fi is running; use an ADC1 pin (32 to 39) for analog input then.

GPIO14, ADC2_CH6, TOUCH6, MTMS

3.3 V

40 mA

JTAG TMS. It outputs a brief signal during boot (reported by secondary sources), so avoid it for things that must stay off at power-up.

GPIO12, ADC2_CH5, TOUCH5, MTDI, Strapping pin

3.3 V

40 mA

Strapping pin MTDI: it must be LOW at reset. Pulled high, it sets the flash supply to 1.8 V and the board boot-loops with "flash read err, 1000". Keep pull-ups and sensors that idle high off this pin.

GND

ground

–

GPIO13, ADC2_CH4, TOUCH4, MTCK

3.3 V

40 mA

ADC2 and a touch channel. analogRead() fails here once Wi-Fi is running; use an ADC1 pin (32 to 39) for analog input then.

flash SD2 (GPIO9) on the older WROOM-32

–

On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.

flash SD3 (GPIO10) on the older WROOM-32

–

On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.

CMD

flash CMD (GPIO11) on the older WROOM-32

–

On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.

5 V supply (EXT_5V)

5 V

–

The 5V rail: USB 5 V after the Schottky diode, or a 5 V input. No reverse-polarity protection and no fuse on this pin.

GND

ground

–

GPIO23, VSPI MOSI

3.3 V

40 mA

VSPI MOSI and a plain output that is not a strapping pin, so it is the safe pin for the lessons' LED.

GPIO22, I2C SCL

3.3 V

40 mA

Arduino's default I²C SCL (and GPIO21 is SDA). Add 4.7 kΩ pull-ups to 3V3 if the module has none.

GPIO1, U0TXD

3.3 V

40 mA

UART0, wired through a 0 Ω link to the USB bridge. The boot log and Serial print here at 115200 baud; leave TX and RX free if you want uploads and the serial monitor.

GPIO3, U0RXD

3.3 V

40 mA

UART0, wired through a 0 Ω link to the USB bridge. The boot log and Serial print here at 115200 baud; leave TX and RX free if you want uploads and the serial monitor.

GPIO21, I2C SDA

3.3 V

40 mA

Arduino's default I²C SCL (and GPIO21 is SDA). Add 4.7 kΩ pull-ups to 3V3 if the module has none.

GND

ground

–

GPIO19, VSPI MISO

3.3 V

40 mA

GPIO18, VSPI SCK

3.3 V

40 mA

GPIO5, VSPI SS, Strapping pin

3.3 V

40 mA

Strapping pin (SDIO timing), pulled up inside; it outputs a brief signal at boot. Fine as SPI chip-select.

GPIO17, U2TXD

3.3 V

20 mA

UART2 TX (GPIO16 is RX). These two pads sit on the flash supply domain and source about 20 mA, not 40. On WROVER boards they belong to the PSRAM.

GPIO16, U2RXD

3.3 V

20 mA

UART2 TX (GPIO16 is RX). These two pads sit on the flash supply domain and source about 20 mA, not 40. On WROVER boards they belong to the PSRAM.

GPIO4, ADC2_CH0, TOUCH0

3.3 V

40 mA

Touch channel T0, used by the touch lesson. Also ADC2.

GPIO0, ADC2_CH1, TOUCH1, Boot, Strapping pin

3.3 V

40 mA

Strapping pin wired to the Boot button: LOW at reset starts the serial downloader instead of your sketch. After boot it works as an input with INPUT_PULLUP (pressed = LOW).

GPIO2, ADC2_CH2, TOUCH2, Strapping pin

3.3 V

40 mA

Strapping pin with an internal pull-down: it must be low or floating to enter download mode. An LED with its resistor to GND is harmless, a pull-up is not.

GPIO15, ADC2_CH3, TOUCH3, MTDO, Strapping pin

3.3 V

40 mA

Strapping pin MTDO, pulled up: held LOW at reset it silences the ROM boot log on TX. Also JTAG TDO.

flash SD1 (GPIO8) on the older WROOM-32

–

On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.

flash SD0 (GPIO7) on the older WROOM-32

–

On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.

CLK

flash CLK (GPIO6) on the older WROOM-32

–

On the older WROOM-32 these were the SPI flash lines (GPIO6 to GPIO11). The WROOM-32E leaves them unconnected inside the module. Never use them; in code, touching GPIO6 to GPIO11 crashes the chip.

Part pin	Board pin
A (through 220 Ω)	23Wire colour orange
K	GNDWire colour black

Part pin

Board pin

A (through 220 Ω)

GND

Part pin	Board pin
1	4Wire colour yellow
3	GNDWire colour black

Part pin

Board pin

GND

Part pin	Board pin
1	GNDWire colour black
2	34Wire colour yellow
3	3V3Wire colour red

Part pin

Board pin

GND

3V3

Part pin	Board pin
+Vs	3V3Wire colour red
Vout	35Wire colour yellow
GND	GNDWire colour black

Part pin

Board pin

+Vs

3V3

Vout

GND

Part pin	Board pin
VCC	5VWire colour red
Trig	18Wire colour orange
Echo (through a 1 kΩ / 2 kΩ divider)	19Wire colour green
Gnd	GNDWire colour black

Part pin

Board pin

VCC

Trig

Echo (through a 1 kΩ / 2 kΩ divider)

Gnd

GND

Part pin	Board pin
brown	GNDWire colour brown
red	5VWire colour red
orange	13Wire colour orange

Part pin

Board pin

brown

GND

red

orange

Part pin	Board pin
VCC	3V3Wire colour red
GND	GNDWire colour black
SCL	22Wire colour yellow
SDA	21Wire colour blue

Part pin

Board pin

VCC

3V3

GND

SCL

SDA

Part pin	Board pin
GND	GNDWire colour black
VCC	3V3Wire colour red
SCL	22Wire colour yellow
SDA	21Wire colour blue

Part pin

Board pin

GND

VCC

3V3

SCL

SDA

ESP32-DevKitC V4

Second chips

On-board controls

On-board LEDs

Power inputs

Rails

Pin current

ESP32-DevKitC V4

Second chips

On-board controls

On-board LEDs

Power inputs

Rails

Pin current

ESP32-DevKitC V4

Lessons

Assembly and power-up

Break it

Key facts

Second chips

On-board controls

On-board controls

On-board LEDs

Pinout

Wire it in

Power and limits

Power inputs

Rails

Pin current

Checked against

ESP32-DevKitC V4

Lessons

Assembly and power-up

Break it

Key facts

Second chips

On-board controls

On-board controls

On-board LEDs

Pinout

Wire it in

Power and limits

Power inputs

Rails

Pin current

Checked against