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+---
+title: Shelly 3EM
+date-published: 2023-08-14
+type: sensor
+standard: uk, us, eu
+board: esp8266
+---
+
+![Shelly 3EM](shelly-3em.webp "Shelly 3EM")
+
+## GPIO Pinout
+
+| Pin    | Function           |
+| ------ | ------------------ |
+| GPIO02 | LED (lower)        |
+| GPIO04 | button (lower LED) |
+| GPIO05 | ADE7880 IRQ1       |
+| GPIO12 | I2C SDA            |
+| GPIO13 | ADE7880 IRQ0       |
+| GPIO14 | I2C SCL            |
+| GPIO15 | Contactor Control  |
+| GPIO16 | ADE7880 RESET      |
+
+Note: The upper LED is not connected to a GPIO (it is connected to the
+ADE7880) so it cannot be used as a normal ESPHome output.
+
+## Calibration Data
+
+It is critically important to retrieve the calbration data from the
+3EM device before installing ESPHome onto it; without that data, it
+will not be possible to get accurate sensor readings. You will need to
+power up the device and let it connect to your network using the
+preloaded Shelly firmware in order to retrieve this data. If you've
+already converted the device to Tasmota and want to switch to ESPHome,
+you'll have the calibration data and can skip steps 1-2 of the
+instructions below.
+
+1. Ensure that you are able to access the device's web interface
+   (http://ip.address.of.device).
+
+1. Download the calibration data file from
+   http://ip.address.of.device/calib.dat. The file will look similar
+   to this:
+
+```json
+{
+  "state": 0,
+  "rms": {
+    "current_a": 3149413,
+    "current_b": 3155641,
+    "current_c": 3177848,
+    "current_n": -1377304018,
+    "current_s": 1804948,
+    "voltage_a": -746938,
+    "voltage_b": -735960,
+    "voltage_c": -753583
+  },
+  "angles": {
+    "angle0": 168,
+    "angle1": 184,
+    "angle2": 176
+  },
+  "powers": {
+    "totactive": {
+      "a": -1346104,
+      "b": -1347476,
+      "c": -1352863
+    },
+    "apparent": {
+      "a": 220798,
+      "b": 220791,
+      "c": 220791
+    }
+  },
+  "energies": {
+    "totactive": {
+      "a": 8986,
+      "b": 8985,
+      "c": 8985
+    },
+    "apparent": {
+      "a": 41655,
+      "b": 41660,
+      "c": 41676
+    }
+  }
+}
+```
+
+1. The `current_X` values from the `rms` section will go into the
+   `calibration -> current_gain` entries in your configuration. Use the
+   `current_s` value for the `neutral` phase, if you are enabling that
+   phase's current sensor.
+
+1. The `voltage_X` values from the `rms` section will go into the
+   `calibration -> voltage_gain` entries in your configuration.
+
+1. The `totactive` values from the `powers` section will go into the
+   `calibration -> power_gain` entries in your configuration.
+
+1. The `angleN` values from the `angles` section will go into the
+   `calibration -> phase_angle` entries in your configuration.
+   `angle0` is for `phase A`, `angle1` is for `phase B`, and `angle2`
+   is for `phase C`.
+
+## Example Configuration
+
+```yaml
+esphome:
+  name: shelly-3em
+
+esp8266:
+  board: esp01_1m
+
+# Enable logging
+logger:
+
+# Enable HA API
+api:
+  encryption:
+    key: !secret api_key
+
+# Enable OTAs
+ota:
+  password: !secret api_password
+
+# Sync RTC with HA
+time:
+  - platform: homeassistant
+    timezone: America/Chicago
+
+# Wi-Fi Setup
+wifi:
+  ssid: !secret wifi_ssid
+  password: !secret wifi_password
+
+  power_save_mode: LIGHT
+
+  # Enable fallback hotspot (captive portal) in case Wi-Fi connection fails
+  ap:
+    ssid: shelly-3em AP
+    password: !secret ap_password
+
+captive_portal:
+
+i2c:
+  sda: GPIO12
+  scl: GPIO14
+  frequency: 200kHz
+
+status_led:
+  pin:
+    number: GPIO2
+
+switch:
+  - id: relay
+    name: Shelly 3EM Relay
+    platform: gpio
+    pin:
+      number: GPIO15
+
+binary_sensor:
+  - id: button
+    name: Shelly 3EM Button
+    platform: gpio
+    pin:
+      number: GPIO4
+      mode: INPUT_PULLUP
+      inverted: true
+
+sensor:
+  - id: ade7880_device
+    platform: ade7880
+    irq0_pin:
+      number: GPIO13
+    irq1_pin:
+      number: GPIO5
+    reset_pin:
+      number: GPIO16
+    frequency: 60Hz
+    phase_a:
+      name: Phase A
+      voltage: Voltage
+      current: Current
+      active_power: Active Power
+      power_factor: Power Factor
+      forward_active_energy: Forward Active Energy
+      reverse_active_energy: Reverse Active Energy
+      calibration:
+        current_gain: 3116628
+        voltage_gain: -757178
+        power_gain: -1344457
+        phase_angle: 188
+    phase_b:
+      name: Phase B
+      voltage: Voltage
+      current: Current
+      active_power: Active Power
+      power_factor: Power Factor
+      forward_active_energy: Forward Active Energy
+      reverse_active_energy: Reverse Active Energy
+      calibration:
+        current_gain: 3133655
+        voltage_gain: -755235
+        power_gain: -1345638
+        phase_angle: 188
+    phase_c:
+      name: Phase C
+      voltage: Voltage
+      current: Current
+      active_power: Active Power
+      power_factor: Power Factor
+      forward_active_energy: Forward Active Energy
+      reverse_active_energy: Reverse Active Energy
+      calibration:
+        current_gain: 3111158
+        voltage_gain: -743813
+        power_gain: -1351437
+        phase_angle: 180
+    neutral:
+      name: Neutral
+      current: Current
+      calibration:
+        current_gain: 311123
+```
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