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There is no single current figure for an ESP32 presence-triggered display: the board, sensor, display, backlight, and wake schedule all affect consumption. Espressif specifies 10 µA deep-sleep power consumption for the ESP32 chip, but that is not the draw of a complete device. Published board examples range from 250 µA for an Adafruit MagTag in a specified deep-sleep configuration to about 170 mA for an Adafruit RGB-display board in normal operation. To estimate your own build, measure the complete device across a realistic detect-wake-update-sleep cycle.
Why there is no single power figure
An ESP32 presence-triggered display is a system, not just a microcontroller. Its current can include the ESP32, development-board circuitry and regulator, presence sensor, display controller, screen, and—on a backlit display—the backlight. How often the sensor wakes the device and how long the display remains active also affect average consumption.
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Espressif lists 10 µA deep-sleep power consumption for the ESP32 chip in its ESP32 Datasheet, version 5.3. That figure does not establish the sleep current of an assembled display. In its current-consumption measurement guidance, Espressif cautions that development-board circuits can continue drawing power during deep sleep.
Published examples show how much the build matters
| Example | Reported consumption | What the figure describes |
|---|---|---|
| ESP32 chip | 10 µA deep-sleep power consumption | Espressif’s chip specification; not a complete board or display assembly. |
| ESP32-S3-WROOM-1 example | 8.14 µA deep-sleep current and about 23.88 mA active current | Espressif’s example waveform. It reports 26.85 µW average power during the deep-sleep interval, 78.32 mW during the active interval, and 6.37 mW total power consumption per cycle. These are measurements for that module and test cycle, not a prediction for another build. |
| Adafruit Qualia ESP32-S3 RGB-display board | About 170 mA in normal operation; about 8 mA with only the backlight off; below 1 mA after the documented full shutdown sequence | Adafruit’s board-specific figures in its deep-sleep guide, published in 2023 and edited in 2026. |
| Adafruit MagTag e-ink board | 250 µA in deep sleep | Adafruit’s reported board draw with NeoPixels and the speaker amplifier disabled, in its MagTag guide, originally published in 2020 and describing the 2025 board revision. |
These are different chips, boards, peripherals, and operating states; they are examples, not directly comparable display-panel specifications. In particular, the MagTag value is for the board in the stated configuration, not the isolated e-ink panel.
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Why display shutdown changes the result
Backlit RGB or TFT displays
A backlight can remain a substantial load even after the screen image stops changing. In the Qualia example, switching off only the backlight reduced the reported board draw from about 170 mA to about 8 mA. The full documented shutdown sequence brought it below 1 mA.
Adafruit notes that the order and GPIO configuration matter: its guide says reversing steps or skipping output-register reconfiguration can leave the backlight on, with current draw around 170–200 mA. Follow the board’s specific shutdown instructions; those figures should not be assumed for other boards.
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E-ink displays
An e-ink image can remain visible without continuous backlighting, but that does not make the entire device draw zero current. Adafruit’s MagTag example measured 250 µA for the board in deep sleep with its NeoPixels and speaker amplifier disabled. Its other circuitry still contributes to the board-level figure.
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Measure at the battery or supply input of the fully assembled device. Capture enough of the current waveform to include both low-current idle periods and wake or display peaks; a sleep-only reading will not describe the complete cycle.
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- Establish the measurement point. Put the instrument in series with the complete device’s supply so the reading includes the board, sensor, display, and other connected loads.
- Record useful operating states. Where practical, compare the sleeping board alone, the board with its presence sensor detecting, the attached display in its sleep state, and the complete detect-wake-update-sleep cycle. This helps locate loads that remain on when the ESP32 sleeps.
- Capture a representative cycle. Include ordinary idle time, presence events, any network activity, display refresh or backlight-on time, and the return to sleep. Use a realistic event frequency and awake duration.
- Calculate the cycle average. Use the measured current or energy over the full cycle to estimate average consumption. A single peak or deep-sleep reading cannot substitute for this average.
Espressif warns that ordinary ammeters may not change ranges quickly enough for rapidly changing loads, and their internal resistance can cause voltage drop. Its measurement guide describes a suitable low-resistance, wide-dynamic-range instrument; its example uses a Joulescope and also names Nordic’s Power Profiler Kit II. Check the exact instrument variant and availability before choosing one.
Estimating battery life
The title alone does not provide enough information to calculate a defensible runtime. You need the complete build’s average consumption across realistic presence events, plus the usable capacity of the selected battery. Conversion losses and the battery’s cutoff behavior also affect how much of its rated capacity is available to the device. Measure the cycle first, then estimate runtime from those project-specific inputs rather than from the ESP32 chip’s sleep specification.
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What to compare when choosing between builds
For two candidate designs, compare measurements taken at the same system boundary and under representative use. Useful values are:
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- Full-system sleep current with the presence sensor still enabled.
- Display and backlight current while the screen is active.
- Energy used for a wake and display refresh, including any network activity.
- How long the display stays active and how often presence events occur.
- Where current was measured and whether the instrument can capture both sleep levels and wake peaks.
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