Specifications
Table Of Contents
2 . PIN DEFINITIO NS
IO35 NC
39: GND
IO32
IO19
IO33
IO18
IO25 IO5
IO26
IO17
IO27
IO16
IO14 IO4
IO12 IO0
GND
IO23
IO22
TXD0
RXD0
IO21
GND
3V3
EN
SENSOR_VP
SENSOR_VN
IO34
Keepout Zone
GND
IO13
SD2
SD3
CMD
CLK
SD0
SD1
IO15
IO2
2.
Pin Definitions
2.1
Pin Layout
1
38
2
37
3
36
4
35
5
34
6
33
7
32
8
31
9
30
10
29
11
28
12
27
13
26
14
25
Figure 1: ESP01 Pin layout
2.2
Pin Description
ESP01 has 38 pins. See pin definitions in Table 3.
Table 3: Pin Definitions
Name
No.
Type
Function
GND
1
P
Ground
3V3
2
P
Power supply.
EN
3
I
Chip-enable signal. Active high.
SENSOR_VP
4
I
GPIO36, SENSOR_VP, ADC_H, ADC1_CH0, RTC_GPIO0
SENSOR_VN
5
I
GPIO39, SENSOR_VN, ADC1_CH3, ADC_H, RTC_GPIO3
IO34 6
I
GPIO34, ADC1_CH6, RTC_GPIO4
IO35
7
I
GPIO35, ADC1_CH7, RTC_GPIO5
IO32 8 I/O
GPIO32, XTAL_32K_P (32.768 kHz crystal oscillator input), ADC1_CH4,
TOUCH9, RTC_GPIO9
15
16
17
18
19
20
21
22
23
24