Hoping I can explain this reasonably well in text to start with, and will work on a wiring diagram.
The background:
- Roller shutter controller runs off 12v, with its own solar panel and NiMh battery.
- This powers a 12v DC motor that uses polarity switching for up/down. Appears to have built-in end stops.
- RF remote with up/stop/down. Single press of each will run the shutter the full length. Controller
- Controller has a “smart home connection” which is just three wires - common / up / down. This connection header requires the direction+common to be closed to run the motor, in contrast to the remote that is a single button press.
Managed to get ESPHome onto a Shelly Uni, and can get basic up/down using a timed cover:
esphome:
name: roller-shutter-1
friendly_name: roller-shutter-1
esp8266:
board: esp01_1m
wifi:
ssid: !secret wifi_iot_ssid
password: !secret wifi_iot_password
ap:
ssid: $friendly_name Fallback Hotspot
password: !secret esphome_fallback_ap_password
captive_portal:
logger:
api:
encryption:
key: !secret esphome_api_key
ota:
password: !secret esphome_api_password
switch:
- platform: gpio
pin: GPIO15
name: "relay1"
id: relay1
internal: true
- platform: gpio
pin: GPIO4
name: "relay2"
id: relay2
internal: true
cover:
- platform: time_based
device_class: shutter
name: "shutter1"
manual_control: true
open_action:
- switch.turn_on: relay1
open_duration: 19.5s
close_action:
- switch.turn_on: relay2
close_duration: 17s
stop_action:
- switch.turn_off: relay1
- switch.turn_off: relay2
sensor:
- platform: adc
pin: A0
name: "shutter1 voltage"
The Shelly is just piggybacked off the battery +ve/-ve between the battery and the existing controller. I assume the voltage will fluctuate a bit especially when the panel is charging the battery, however the Shelly can take 12-36v DC.
The issues I’d like advice on are:
- It seems like depending on the power in the battery, the “up” timing is pretty variable
- Do I need interlock protection? Seems like the controller itself has it?
- I’m guessing I will have to find a ground on the controller board to use for the ADC, with the +ve connected to +ve on the battery?
EDIT: Added circuit diagram & PCB pics:
The 4 pin header at the bottom has a label called “Dev” or similar, not nothing else.
