ESPHome Sensor Telemetry Tool

ESPHome Battery Life Calculator: ESP32 Deep Sleep

Estimate ESP32 deep sleep battery life, compare peak current draw and sensor power budgets, and generate a starter ESPHome YAML snippet for your Home Assistant node.

Hardware & Sensor Components

Microcontroller Board Platform

Power Supply & Power Mode

Connected Sensors & Accessories

LD2410 mmWave Human Presence Radar (+80mA)

BME280 Temp / Humidity / Pressure (+3mA)

SCD40 NDIR CO2 Air Quality Sensor (+18mA avg)

SSD1306 0.96" OLED Status Display (+25mA)

Peak Current Draw

323 mA

Wi-Fi TX Transmission Peak

Peak Power Draw

1.07 W

Peak Current at 3.3 V

Battery Runtime

Always On

Wall Powered

esphome_multisensor.yaml Snippet

esphome:
  name: living-room-multisensor

esp32:
  board: esp32dev

i2c:
  scan: true

uart:
  id: ld2410_uart
  tx_pin: GPIO17
  rx_pin: GPIO16
  baud_rate: 256000
  parity: NONE
  stop_bits: 1

ld2410:
  uart_id: ld2410_uart

sensor:
  - platform: bme280_i2c
    address: 0x76
    temperature:
      name: "Living Room Temperature"
    humidity:
      name: "Living Room Humidity"

binary_sensor:
  - platform: ld2410
    has_target:
      name: "Occupancy Presence Detected"

ESPHome Hardware Guidelines

mmWave presence sensors (LD2410) require continuous power and should not be used on battery nodes.
Add a 470uF electrolytic capacitor across 3.3V power rails to absorb Wi-Fi TX current spikes.

Before you build the node

Battery sizing is the last decision, not the first. What Home Assistant runs on, and which radio mesh your other devices already use, both change whether a DIY ESPHome node is the right answer at all.

Zigbee vs Z-Wave vs Thread: which mesh to build · when an off-the-shelf mesh sensor beats a Wi-Fi node you have to power yourself.
Home Assistant hardware: what to run it on · hub choices, radio budget and where the coordinator should physically sit.
Home Assistant OS vs Container · the install method decides whether the ESPHome tooling is one click or another container.

Figures here are planning estimates. Per-board peak current is the 802.11b Wi-Fi TX row of the Espressif ESP32, ESP32-C3, ESP32-S3 and ESP8266EX datasheets at 3.3 V; the YAML follows the ESPHome component documentation. Verify against your own board and sensor revisions before committing to a battery.