Datasheet

V_BATT should be a single-
cell LiPo battery.
V_USB - 6V MAX
V_BATT - Single Cell (4.2V MAX)
GND
GND
GND
GND
GND
MCP73831
GND GND GND
1A/23V/620mV
GND
VIN
GND
AP2112K-3.3V
2.5A/30V
V_USB
V_USB
V_BATT
V_BATT
V_USB
GND
3.3V
3.3V
GND
CP2102N
3.3V
GND
ESP-WROOM-32NARROW
V_BATTV_USB
3.3V
GND
3.3V
GND
GND
GND
1 3
42
VIN
4
STAT
1
VBAT
3
PROG
5
VSS
2
U1
D2
2
1
IN
GND
OUT
EN
BP
U3
Q1
1
2
3
4
RI/CLK
1
GND
2*2
D+
3
D-
4
VIO
5
VDD
6
VREGIN
7
VBUS
8
RSTB
9
GPIO3/WAKEUP
11
GPIO2/RS485
12
GPIO1/RXT
13
GPIO0/TXT
14
SUSPENDB
15
SUSPEND
17
CTS
18
RTS
19
RXD
20
TXD
21
DSR
22
DTR
23
DCD
24
U4
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
GND
1
3V3
2
EN
3
SENSOR_VP
4
SENSOR_VN
5
IO34
6
IO35
7
IO32
8
IO33
9
IO25
10
IO26
11
IO27
12
IO14
13
IO12
14
GND
15
IO13
16
SHD
17
SWP
18
SCS
19
GND
38
IO23
37
IO22
36
TXD
35
RXD
34
IO21
33
IO20
32
IO19
31
IO18
30
IO5
29
IO17
28
IO16
27
IO4
26
IO0
25
IO2
24
IO15
23
SDI
22
SDO
21
SCK
20
GND
GND
U2
1 3
42
D+
D-
VBUS
GND
ID
SHIELD*10
CHIP_PU
CHIP_PU
CHIP_PU
DTR
DTR
D-
D+
RTS
RTS
0
0
0
A0
A0
A1
A1
A2
A2
A3A3
A4
A4
A5
A5
SCK
SCK
MOSI
MOSI
MISO
MISO
RX
RX
TX
TX
SDA
SDA
SDA
SCL
SCL
SCL
14
14
32
32
15
15
33
33
27
27
12
12
13
13
13
EN
16
16
17
17
20
21
21
Espressif ESP32
v20
Original ESP32 Thing by Jim Lindblom
Mike Hord
GPIO0 Button
Revised by: Alex Wende
Released under the Creative Commons
Attribution Share-Alike 4.0 License
https://creativecommons.org/licenses/by-sa/4.0/
Design by:
THIS IS A FOUR-LAYER BOARD!
USB