EttroIT ESR3516/ESR3532 DIN Rail RCBO
Maker: https://ettroit.com/
Also available on Aliexpress with other namings, but without certifications.
Installation
NOTE: Before flashing always make a backup of the original firmware.
These units generally ship with a firmware which is no longer exploitable by tuya-fwcutter, so some disassembly and soldering will be required to flash using serial.
First, you need to separate the motor unit from the RCBO, open the two plastics un top and botton that keep the unit together, there is also a tiny screw, on the motor unit, remove it before separating the two units. Second, the 6 rivets need to be drilled out with a 2mm drill bit from the motor unit. You'll need something to replace these when you reassemble the unit; M1.6 nuts and 16mm bolts work well, also there are available some rivets on the internet marketplaces, in case you want to use rivets, you will need 2mm diameter, 18mm length.
Once open, try to not move the controlling wheels mechanism and keep some photo to remount everything in the right place in case something moves or is accidentally removed from it's place, you will need 4 points to solder and attach the serial connection:
All the pins you need to flash the device are accessible:
- VDD / +3.3v (red circled visible in the open unit)
- GND (black one circled visible in the open unit)
NOTE: to check if GND is correct use a multimeter and check who gives you short circuit against metal shell of CBU, that is GND access, other one is VDD
- RX (white circled visible in open unit)
- TX (green circled visible in open unit)
NOTE: TX and RX are referred as per CBU spec, so you have to use TX for RX and vice versa when connecting to serial
You don't need to completely remove the board from the device, as shown in the picture above. But do not attempt to flash it while it's connected to the mains!
When ltchiptool says Getting bus... (now, please do reboot by CEN or by power off/on) disconnect and reconnect the GND
line, and it should proceed.
Tuya Datapoints
| Datapoints | Function |
|---|---|
| 1 | Turns on or off RCBO |
| 102 | Mechanic Lock (binary sensor) |
| 103 | Remote Lock (switch) |
| 104 | Local Lock (binary sensor) |
NOTE: When remote lock is active you won't be able to activate the RCBO locally, also, if not remotely locked, with local lock you won't be able to do any action in the RCBO or other datapoints
Configuration
- Per-device configuration:
substitutions:
name: "remote-rcbo"
friendly_name: "Remote RCBO"
bk72xx:
board: generic-bk7231n-qfn32-tuya
esphome:
name: $name
friendly_name: $friendly_name
name_add_mac_suffix: false
mdns:
text_sensor:
- platform: libretiny
version:
name: LibreTiny Version
# Enable logging
logger:
level: INFO
# Enable Home Assistant API
api:
encryption:
key: !secret api
reboot_timeout: 30min
ota:
- platform: esphome
password: !secret ota
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
reboot_timeout: 20min
button:
- platform: restart
name: "Restart"
id: button_restart
binary_sensor:
- platform: tuya
id: mlock
sensor_datapoint: 102
name: Mechanic Lock
on_press:
then: #remove remote lock so we can rearm the device in case it goes offline!
- switch.turn_off: rlock
- platform: tuya
id: llock
sensor_datapoint: 104
name: Local Lock
uart:
rx_pin: RX1
tx_pin: TX1
baud_rate: 115200
tuya:
switch:
- platform: tuya
switch_datapoint: 1
name: Switch
id: MTD
restore_mode: RESTORE_DEFAULT_OFF
- platform: tuya
id: rlock
switch_datapoint: 103
name: Remote Lock
restore_mode: RESTORE_DEFAULT_OFF
A more complex configuration can allow the switch to be reset automatically, like the one shown below:
substitutions:
name: "remote-rcbo"
friendly_name: "Remote RCBO"
bk72xx:
board: generic-bk7231n-qfn32-tuya
esphome:
name: $name
friendly_name: $friendly_name
name_add_mac_suffix: false
mdns:
text_sensor:
- platform: libretiny
version:
name: LibreTiny Version
# Enable logging
logger:
level: INFO
# Enable Home Assistant API
api:
encryption:
key: !secret api
reboot_timeout: 30min
ota:
- platform: esphome
password: !secret ota
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
reboot_timeout: 20min
button:
- platform: restart
name: "Restart"
id: button_restart
binary_sensor:
- platform: tuya
id: mlock
sensor_datapoint: 102
name: Mechanic Lock
on_press:
then: #remove remote lock so we can rearm the device in case it goes offline!
- switch.turn_off: rlock
on_release:
then:
- lambda: |-
(id(attempts) = 0);
- platform: tuya
id: llock
sensor_datapoint: 104
name: Local Lock
on_release:
then:
- lambda: |-
(id(attempts) = 0);
uart:
rx_pin: RX1
tx_pin: TX1
baud_rate: 115200
tuya:
switch:
- platform: tuya
switch_datapoint: 1
name: Switch
id: MTD
restore_mode: RESTORE_DEFAULT_OFF
on_turn_on:
then:
- script.stop: cycle_script
- script.stop: act_script
- script.execute: act_script
on_turn_off:
then:
- script.stop: act_script
- script.stop: cycle_script
- script.execute: cycle_script
- platform: tuya
id: rlock
switch_datapoint: 103
name: Remote Lock
restore_mode: RESTORE_DEFAULT_OFF
on_turn_off:
then:
- lambda: |-
(id(attempts) = 0);
globals:
- id: attempts
type: int
restore_value: False
initial_value: "0"
script:
- id: cycle_script
mode: single
then:
- if:
condition:
and:
- switch.is_off: MTD
- switch.is_off: rlock
- binary_sensor.is_off: mlock
- lambda: |-
return (id(attempts) < 3);
then:
- lambda: |-
(id(attempts) += 1);
- delay: !lambda |-
return (id(attempts) * 180000);
- if:
condition:
and:
- switch.is_off: MTD
- switch.is_off: rlock
- binary_sensor.is_off: mlock
then:
- switch.turn_on: MTD
- id: act_script
mode: single
then:
- delay: 2 min
- if:
condition:
- switch.is_on: MTD
then:
- lambda: |-
(id(attempts) = 0);
NOTE: this particular configuration will rearm the RCBO for 3 times, with a 3 minute timer multiplied per number or retries (so 3, 6 and 9 minutes).
Test Report EMC Test Report LVD Certification Conformity LVD ECD