WLED/usermods/multi_relay/readme.md
Blaz Kristan b2df7981a9 Add support for PCF8574 I2C port expander
- for Multi Relay usermod.
2023-05-24 23:40:23 +02:00

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# Multi Relay
This usermod-v2 modification allows the connection of multiple relays, each with individual delay and on/off mode.
Usermod supports PCF8574 I2C port expander to reduce GPIO use.
PCF8574 supports 8 outputs and each output corresponds to a relay in WLED (relay 0 = port 0, etc). I you are using more than 8 relays with multiple PCF8574 make sure their addresses are set conscutively (e.g. 0x20 and 0x21). You can set address of first expander in settings.
(**NOTE:** Will require Wire library and global I2C pins defined.)
## HTTP API
All responses are returned in JSON format.
* Status Request: `http://[device-ip]/relays`
* Switch Command: `http://[device-ip]/relays?switch=1,0,1,1`
The number of values behind the switch parameter must correspond to the number of relays. The value 1 switches the relay on, 0 switches it off.
* Toggle Command: `http://[device-ip]/relays?toggle=1,0,1,1`
The number of values behind the parameter switch must correspond to the number of relays. The value 1 causes the relay to toggle, 0 leaves its state unchanged.
Examples:
1. total of 4 relays, relay 2 will be toggled: `http://[device-ip]/relays?toggle=0,1,0,0`
2. total of 3 relays, relay 1&3 will be switched on: `http://[device-ip]/relays?switch=1,0,1`
## JSON API
You can toggle the relay state by sending the following JSON object to: `http://[device-ip]/json`
Switch relay 0 on: `{"MultiRelay":{"relay":0,"on":true}}`
Switch relay 3 and 4 off: `{"MultiRelay":[{"relay":2,"on":false},{"relay":3,"on":false}]}`
## MQTT API
* `wled`/_deviceMAC_/`relay`/`0`/`command` `on`|`off`|`toggle`
* `wled`/_deviceMAC_/`relay`/`1`/`command` `on`|`off`|`toggle`
When a relay is switched, a message is published:
* `wled`/_deviceMAC_/`relay`/`0` `on`|`off`
## Usermod installation
1. Register the usermod by adding `#include "../usermods/multi_relay/usermod_multi_relay.h"` at the top and `usermods.add(new MultiRelay());` at the bottom of `usermods_list.cpp`.
or
2. Use `#define USERMOD_MULTI_RELAY` in wled.h or `-D USERMOD_MULTI_RELAY` in your platformio.ini
You can override the default maximum number of relays (which is 4) by defining MULTI_RELAY_MAX_RELAYS.
Example **usermods_list.cpp**:
```cpp
#include "wled.h"
/*
* Register your v2 usermods here!
* (for v1 usermods using just usermod.cpp, you can ignore this file)
*/
/*
* Add/uncomment your usermod filename here (and once more below)
* || || ||
* \/ \/ \/
*/
//#include "usermod_v2_example.h"
//#include "usermod_temperature.h"
#include "../usermods/usermod_multi_relay.h"
void registerUsermods()
{
/*
* Add your usermod class name here
* || || ||
* \/ \/ \/
*/
//usermods.add(new MyExampleUsermod());
//usermods.add(new UsermodTemperature());
usermods.add(new MultiRelay());
}
```
## Configuration
Usermod can be configured via the Usermods settings page.
* `enabled` - enable/disable usermod
* `use-PCF8574` - use PCF8574 port expander instead of GPIO pins
* `first-PCF8574` - I2C address of first expander (WARNING: enter *decimal* value)
* `broadcast`- time in seconds between MQTT relay-state broadcasts
* `HA-discovery`- enable Home Assistant auto discovery
* `pin` - ESP GPIO pin the relay is connected to (can be configured at compile time `-D MULTI_RELAY_PINS=xx,xx,...`)
* `delay-s` - delay in seconds after on/off command is received
* `active-high` - assign high/low activation of relay (can be used to reverse relay states)
* `external` - if enabled, WLED does not control relay, it can only be triggered by an external command (MQTT, HTTP, JSON or button)
* `button` - button (from LED Settings) that controls this relay
If there is no MultiRelay section, just save current configuration and re-open Usermods settings page.
Have fun - @blazoncek
## Change log
2021-04
* First implementation.
2021-11
* Added information about dynamic configuration options
* Added button support.
2023-05
* Added support for PCF8574 I2C port expander (multiple)