// other
INA219
DC current + voltage monitor
€4.50
avg eur
I2C
Pins
6
Specs
4
Libraries
1
Protocols
1
// wiring → esp32 devkit v1
VCC
3V3
EN
GPIO36
VP
GPIO39
VN
GPIO34
GPIO35
GPIO32
GPIO33
GPIO25
GPIO26
GPIO27
GPIO14
GPIO12
GND
GND
GPIO13
ESP32
WROOM-32
devkit v1
USB
VIN
5V
GND
GPIO23
GPIO22
SCL
SCL
GPIO1
TX0
GPIO3
RX0
GPIO21
SDA
SDA
GPIO19
MISO
GPIO18
SCK
GPIO5
SS
GPIO17
TX2
GPIO16
RX2
GPIO4
GPIO2
GPIO15
sensor pin (left)
sensor pin (right)
unused
// pinout → esp32
| Sensor Pin | ESP32 Connection |
|---|---|
| VCC | 3.3V |
| GND | GND |
| SCL | GPIO 22 |
| SDA | GPIO 21 |
| VIN+ | to load+ |
| VIN- | to load supply |
// technical specs
Voltage
0–26V
Current
±3.2A (default shunt)
I2C addr
0x40 (configurable)
Resolution
1 mA
// github libraries
// notes & warnings
Shunt is 0.1Ω. Replace with 0.01Ω for higher current ranges. INA226 = better resolution.
// related sensors · other
Submitted by caio.ricciuti@outlook.com
· Apr 26, 2026