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+--- Thread: how to add relay board to ESPHome by Modbus Controller Switch (/showthread.php?tid=2757)
how to add relay board to ESPHome by Modbus Controller Switch - admin - 04-03-2023
uart:
id: mbus
tx_pin: GPIO13
rx_pin: GPIO16
baud_rate: 9600
modbus:
id: modbus1
uart_id: mbus
send_wait_time: 200ms
modbus_controller:
- id: a6
address: 1
modbus_id: modbus1
update_interval: 1s
switch:
- platform: modbus_controller
name: 'modbus-switch1'
address: 0 # 0:relay1 1:relay2 ......
register_type: coil
bitmask: 1
this is a demo , i have created one switch button in ESPHome, you can create many others.
KinCony Products use modbus command:
01 05 00 00 FF 00 turn on relay1
01 05 00 00 00 00 turn off relay1
make sure your relay board as these:
ON = 0xFF00 OFF=0000
if your relay board not use by this protocol. you can also write esphome as "write_lambda" way. i have tested, "write_lambda" to create switch also work fine. just need to create ON and OFF two command.
write_lambda: |-
ESP_LOGD("main","Modbus Switch incoming state = %f",x);
// return false ; // use this to just change the value
payload.push_back(0x1); // device address
payload.push_back(0x5); // force single coil
payload.push_back(0x00); // high byte address of the coil
payload.push_back(0x00); // low byte address of the coil
payload.push_back(0xFF); // ON = 0xFF00 OFF=0000
payload.push_back(0x00);
return true;