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For a small, always-on sensor or switch, an ESP32 is usually the better choice than a Raspberry Pi: it is inexpensive, uses little power, includes Wi-Fi and Bluetooth, and connects directly to sensors and relays. A Raspberry Pi is still the better choice for running Home Assistant, Linux, storage, dashboards, databases, backups, and several services.
That makes the practical answer “ESP32 plus Raspberry Pi,” not “ESP32 instead of Raspberry Pi.” Put Home Assistant on a Pi (or another supported host), then distribute inexpensive ESP32 nodes around the house. The four projects below show where that split saves money, space, and energy.
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What the ESP32 does better than a Raspberry Pi
An ESP32 is a microcontroller system-on-chip rather than a general-purpose Linux computer. Espressif describes it as integrating 2.4 GHz Wi-Fi, Bluetooth, two high-performance 32-bit LX6 CPU cores, an ultra-low-power coprocessor, and multiple peripherals. Its application list includes smart-home devices and low-power IoT sensor hubs.
The datasheet lists 34 programmable GPIOs, an up-to-18-channel 12-bit ADC, two 8-bit DACs, four SPI interfaces, two I2C interfaces, three UARTs, LED and motor PWM, five power modes, and quoted deep-sleep consumption of 10 µA. Those capabilities are a close fit for reading a sensor, watching a contact, producing a control signal, or driving a small display. You do not need to boot Linux for any of those jobs.
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| Decision point | ESP32 | Raspberry Pi |
|---|---|---|
| Software scope | Firmware and device logic | Linux and applications such as Home Assistant |
| Connectivity | Integrated 2.4 GHz Wi-Fi and Bluetooth | Acts as a networked host for services and integrations |
| Hardware interface | GPIO, ADC/DAC, I2C, SPI, UART and PWM for direct wiring | General-purpose computer that can coordinate external hardware |
| Deployment | Small distributed nodes, including low-power modes | Continuously powered central host |
| Best role in a smart home | Sensor, button, relay-control or display endpoint | Home Assistant host, dashboards, storage, backups and add-ons |
| Internet-outage behavior | Local ESPHome devices and automations can continue when the internet is unavailable, provided the device and network remain powered | Can keep Home Assistant and other local services running without internet access |
The Pi’s advantage is system scope. Home Assistant’s documentation lists a Raspberry Pi, mini PC, NUC or virtual machine as possible hosts. A Pi can also run a database, file share, dashboard, backup process and other software beside Home Assistant. An ESP32 is not a replacement for that operating-system layer; it is a cheap endpoint that makes the layer more useful.
How ESPHome connects the nodes to Home Assistant
ESPHome builds firmware for inexpensive microcontrollers such as the ESP32. You describe the device in a visual builder or YAML, install the firmware from a browser or over the air, and then connect it to Home Assistant on the local network. ESPHome states that a new device appears automatically in Home Assistant without a cloud account or external server.
- Prepare the host. Install Home Assistant on a Raspberry Pi, mini PC, NUC or virtual machine, and connect that host to your home network.
- Create the device configuration. Choose the ESP32 board in ESPHome, add the sensor or output component, and assign the GPIO pins used by your hardware.
- Install the first firmware. Use the browser-based installer or a USB connection for the initial flash. After the node joins Wi-Fi, later updates can be delivered over the air.
- Adopt the node in Home Assistant. The ESPHome integration discovers the device locally. Add its entities to dashboards or automations.
- Test locally. Disconnect the internet while leaving the router, Home Assistant host and ESP32 powered. Local sensors, switches and automations should continue responding; a cloud-only device may not.
Keep the Pi for central history and dashboards, and use ESP32 boards where a wire run, a sensor or a relay needs a dedicated controller. This architecture also limits the impact of a failure: one offline node does not take down every room.
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A BME280 connected to an ESP32 provides temperature, relative humidity and air-pressure readings. The cited wiring example uses I2C with GPIO 22 for SCL and GPIO 21 for SDA, and identifies the BME280 as the recommended option for this build.
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Parts and wiring
- ESP32 development board
- BME280 breakout board
- Four jumper connections for power, ground, SCL and SDA
- USB power supply or another regulated supply suitable for the board
Connect the BME280’s I2C clock line to GPIO 22 and its data line to GPIO 21, following the breakout board’s voltage and pin labels. Keep the sensor away from the ESP32’s regulator and other heat sources; otherwise the temperature reading can be biased by the electronics.
Software setup
- Create an ESPHome node for the ESP32 board.
- Add the BME280 sensor component and select I2C.
- Set SCL to GPIO 22 and SDA to GPIO 21, matching the example wiring.
- Compile and install the firmware, then adopt the node in Home Assistant.
- Add temperature, humidity and pressure entities to a dashboard or use them in local automations.
This is where the ESP32’s low power and small size matter. You can place several nodes in bedrooms, a basement and an attic instead of running a sensor cable back to a central computer. If the project is battery-powered, use an appropriate sleep strategy and measure the resulting reporting interval; a continuously connected Wi-Fi sensor normally needs more energy than a sleeping node.
Project 2: Door, window and motion monitor
Combine a magnetic reed contact with an HC-SR501 PIR module to monitor an opening and detect movement. ESPHome exposes both devices to Home Assistant locally, so a door-open event or motion trigger can start a light, notification or other automation without sending data to a cloud service.
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Install the reed contact
Mount the magnet on the moving door or window and the reed switch on the fixed frame, aligned so the contact changes state when the opening moves. Wire the switch to an ESP32 GPIO using the input arrangement appropriate to your board and configuration. Test the entity in Home Assistant while opening and closing the frame; reverse the logical state in software if “open” and “closed” appear backwards.
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Add the HC-SR501
Connect the PIR module’s power, ground and output to the ESP32. Give the module time to stabilize after power-up, then walk through its field of view and confirm that Home Assistant receives motion events. Adjust the module’s sensitivity and hold-time controls physically, because those settings determine how long a motion event remains active.
Placement and reliability
- Keep the PIR away from heaters, direct sunlight and drafts that can create false triggers.
- Use a short, secure cable run for the reed contact and strain-relieve the enclosure.
- Choose a power source that remains available during the hours when security monitoring matters.
- Build the automation around the local entity state, not an internet service, so an internet outage does not disable the basic response.
An ESP32 is preferable here because the node only reads two digital signals and publishes their state. A Pi would add an operating system and storage requirement without improving the contact or PIR measurement.
Project 3: Relay or switch controller
An ESP32 GPIO can provide the control signal for a relay module, allowing Home Assistant to operate a low-voltage load or a properly enclosed mains-rated switch. The board supplies logic; it does not make an unsafe circuit safe. The relay’s voltage and current rating, isolation, enclosure, wiring and installation determine whether the finished controller is suitable for the load.
Use low voltage for a first build
Start with a low-voltage device such as a fan, pump or LED load whose current and voltage are known. Select a relay module that accepts the ESP32’s control level, connect the module’s control input to a GPIO, and test the relay with the load disconnected. Confirm which logical state means on, because some modules are active-low.
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Treat mains switching as an electrical installation
For household mains, use a relay and enclosure explicitly rated for the voltage, current and load type. Maintain physical separation between low-voltage ESP32 wiring and hazardous conductors, provide strain relief and protective earth where required, and place the assembly in a suitable enclosure. Have a qualified electrician perform or inspect mains work; never prototype exposed mains connections on a breadboard.
Configure the control path
- Define the GPIO output in ESPHome and assign a clear device name.
- Install the firmware and verify the switch entity in Home Assistant with no load connected.
- Check startup behavior so a reboot cannot unexpectedly energize the load.
- Connect the correctly rated load, test manual control, and then add automations.
The ESP32’s fast GPIO and PWM peripherals also leave room for status LEDs, buttons or dimming control when the external hardware supports those functions. The Pi remains useful as the host that stores states and schedules, but it does not need to sit beside every relay.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Project 4: Energy or status display node
For a compact energy monitor or room-status display, an ESP32 can read a pulse output from a meter or drive a small display while Home Assistant stores and visualizes the data. ESPHome documents pulse-based energy monitoring, and its community projects include e-ink and other display nodes.
Pulse-based monitoring
Connect the meter’s pulse output to a suitable ESP32 input and configure ESPHome to count pulses. The meter’s pulse constant and electrical interface must come from the meter documentation; do not assume that two meters use the same number of pulses per unit of energy. Once calibrated, publish the count to Home Assistant and let the host retain long-term history.
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Display-only status
Use the ESP32 to render a few values such as temperature, power, occupancy or alarm state on a small display. An e-ink panel is useful when the screen can remain static for long periods, while another display type may suit frequently changing values. Keep the rendering logic on the node and the data source in Home Assistant.
Why not use a Pi at the display?
A Pi can drive a screen, but it needs a full operating system, storage and a more substantial power supply. For one room-level display or one pulse input, the ESP32 removes that overhead. Use a Pi when the screen must run a browser, a rich dashboard, video or several services at once.
What these boards cost
The “$8” in the headline is an approximate street-price shorthand, not an authoritative current US price. A July 14, 2026 guide from raspberry.tips reports euro-denominated marketplace examples: roughly €3–5 for an ESP32, about €15 for a five-pack of ESP32 DevKit v1 boards, about €6 for a Seeed XIAO ESP32-C3, and about €10 for an ESP32-S3 DevKit. Prices vary by seller, region, shipping and date.
| Board or quantity | Reported example | How to interpret it |
|---|---|---|
| ESP32 board | About €3–5 | Dated marketplace example from July 14, 2026 |
| ESP32 DevKit v1 five-pack | About €15 | Approximately €3 per board before other project parts |
| Seeed XIAO ESP32-C3 | About €6 | Compact board example from the same guide |
| ESP32-S3 DevKit | About €10 | Higher-priced board example from the same guide |
The board is only part of the budget. Add the sensor, relay, enclosure, wiring and power supply, and use a properly rated component for the load. A cheap controller does not justify an under-rated power adapter or an improvised mains enclosure.
When the Raspberry Pi is still the right choice
- You need Home Assistant itself. The Pi is a supported host; the ESP32 is an endpoint.
- You need history or databases. Long-term storage and queries belong on the host.
- You need dashboards or add-ons. A browser dashboard, backup service or multiple integrations require an operating system.
- You need rich local processing. Video, a full browser, large files or several simultaneous services exceed the role of a small microcontroller.
- You need one central computer. A Pi can coordinate many ESP32 nodes while keeping the firmware on each node simple.
Conversely, choose an ESP32 when the requirement is a single sensor, contact, button, relay signal, pulse counter or small display that should run continuously with minimal power and wiring.
Deployment checklist and fixes for common failures
Before installation
- Confirm the board model and GPIO assignments in the ESPHome configuration.
- Check every sensor’s voltage requirements and the relay’s electrical rating.
- Plan Wi-Fi coverage at the final mounting location, not only at the workbench.
- Provide stable power and an enclosure appropriate to the environment.
If the device does not appear in Home Assistant
- Verify that the ESP32 actually joined the same local network as Home Assistant.
- Check the board’s power and observe its status indicator during boot.
- Reconnect by USB and review the firmware log for a wrong board selection, GPIO assignment or Wi-Fi credential.
- Install a corrected configuration over USB, then retry an over-the-air update after the node is reachable.
If readings or triggers are wrong
- Recheck SCL and SDA on the BME280; the cited example uses GPIO 22 and GPIO 21 respectively.
- For a reed switch, test alignment and invert the logical state if the entity is reversed.
- For a PIR, allow its startup stabilization period and adjust sensitivity and hold time.
- For pulse energy monitoring, verify the meter’s pulse constant and electrical interface before changing software filters.
- For relays, test the GPIO state without a load and confirm whether the module is active-high or active-low.
Local control depends on the whole local path remaining powered: the ESP32, Wi-Fi access point and Home Assistant host. Internet access is not required for ESPHome’s local device communication, but a power failure or a downed network still interrupts it.
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