INA219
Also known as: INA219 · GY-219 · Power & energy
The dollar DC power meter: how much is the solar panel making, what's the battery drawing, is the pump actually running — one tiny board answers all of it.
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At a glance
⚑ flag an error| Measures | voltage, current, power |
|---|---|
| Accuracy | DC V/I/P via shunt; 26 V bus max |
| Interface | I2C @ 0x40–0x45 |
| Supply | 3–5.5 V |
| Battery-viable | Yes (deep-sleep friendly) |
| ESPHome | Native ESPHome component — ina219 |
| Typical price | $1-2 (street, varies) |
Compare all sensor modules in one table →
Which one do I buy?
vs INA226: the 226 is more accurate and reads to 36 V for a dollar more — the rising pick for solar projects.
Clone check
Low clone risk. Clone shunt-resistor tolerance varies — calibrate against a multimeter if the absolute number matters.
Good for
Gotchas to know
- High-side shunt tops out at 26 V and ±3.2 A with the stock 0.1 Ω shunt — swap the shunt (and config) for more current.
- Four address straps = four sensors per bus.
Wiring it up
It's I2C, so it shares two pins with every other I2C sensor you own — chain your climate/light/CO2 stack on one bus and mind the address clashes (this one lives at 0x40–0x45). Any ESP32 dev board works.