Pin Definitions; Pin Layout; Pin Description - Espressif ESP01 Quick Start Manual

2 . PIN DEFINITIONS

2. Pin Definitions

2.1 Pin Layout

1
2
3
4
5
6
7
8
9
10
11
12
13
14

2.2 Pin Description

ESP01 has 38 pins. See pin definitions in Table 3.
Name No.
GND 1
3V3 2
EN 3
SENSOR_VP 4
SENSOR_VN 5
IO34 6
IO35 7
IO32 8
Keepout Zone
GND
3V3
EN
SENSOR_VP
SENSOR_VN
IO34
IO35
39: GND
IO32
IO33
IO25
IO26
IO27
IO14
IO12
Figure 1: ESP01 Pin layout
Table 3: Pin Definitions
Type Function
P Ground
P Power supply.
I Chip-enable signal. Active high.
I GPIO36, SENSOR_VP, ADC_H, ADC1_CH0, RTC_GPIO0
I GPIO39, SENSOR_VN, ADC1_CH3, ADC_H, RTC_GPIO3
I GPIO34, ADC1_CH6, RTC_GPIO4
I GPIO35, ADC1_CH7, RTC_GPIO5
GPIO32, XTAL_32K_P (32.768 kHz crystal oscillator input), ADC1_CH4,
I/O
TOUCH9, RTC_GPIO9
38
GND
IO23 37
36
IO22
TXD0 35
34
RXD0
33
IO21
NC
32
31
IO19
IO18 30
IO5 29
IO17 28
IO16 27
IO4
26
IO0
25