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我的两个开关在运行一年半后先后无法启动,推测问题在于其使用的劣质 DC-DC 电源模块 KP3210SG 及其外围的电容 C5
(10 V,470 μF)。具体表现为:电容 C5 鼓包、KP3210SG 输出电压过低导致 ESP 模块因供电电压不足(仅约 1.8 V)无法工作。
硬件
GPIO 引脚功能
GPIO 引脚 | 功能 |
---|---|
3 | LED 指示灯(低电平触发) |
4 | 开关 S1 信号(低电平触发) |
5 | 开关 S2 信号(低电平触发) |
12 | 继电器 L1 |
13 | 配对按钮 |
14 | 继电器 L2 |
来源:https://devices.esphome.io/devices/loratap-sc500w/
外壳有三处卡扣,很容易撬开,PCB 正面:
反面:
运气不错,使用的模块是基于 ESP8285 的 TYWE2S,而不是基于 BK72XX 系列 SoC 的新模块。
根据资料,分别给 TX
、RX
、GND
、3V3
引脚焊上线:
并短接模块背面的 IO0
触点与 GND
:
软件
ESPHome 配置示例:
substitutions:
device_name: '百叶窗 1'
esphome:
name: shutter-1
comment: '卷帘百叶窗开关 1'
esp8266:
board: esp8285 # 1 MB 闪存
restore_from_flash: false
preferences:
flash_write_interval: 24h # 降低闪存写入频率以避免磨损,按需调整
logger:
level: WARN
# baud_rate: 115200
wifi:
fast_connect: true
networks:
- ssid: !secret wifi_ssid
bssid: !secret wifi_bssid
password: !secret wifi_password
domain: !secret domain_name
api:
ota:
password: !secret ota_password
button:
# 硬重启
- platform: restart
id: restart_button
name: '重启 ${device_name}'
entity_category: diagnostic
status_led: # 自带 LED
pin:
number: 3
inverted: true
binary_sensor:
# 外部开关
- platform: gpio
id: switch_open
pin:
number: 4
inverted: true
on_press:
then:
- cover.open: shutter
on_release:
then:
- cover.stop: shutter
internal: true
- platform: gpio
id: switch_close
pin:
number: 5
inverted: true
on_press:
then:
- cover.close: shutter
on_release:
then:
- cover.stop: shutter
internal: true
# 把配对按钮用作硬重启按钮
- platform: gpio
id: pairing_button
pin: 13
on_release:
then:
- button.press: restart_button
internal: true
# 继电器们
output:
- platform: gpio
id: relay_open
pin: 12
- platform: gpio
id: relay_close
pin: 14
cover:
- platform: time_based
id: shutter
name: '${device_name}'
device_class: shutter
open_action:
- output.turn_off: relay_close
- output.turn_on: relay_open
open_duration: 40s # 调整为实际全开耗时
close_action:
- output.turn_off: relay_open
- output.turn_on: relay_close
close_duration: 40s # 调整为实际全关耗时
stop_action:
- output.turn_off: relay_open
- output.turn_off: relay_close
assumed_state: true
接入 Home Assistant:
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