Pixel led MQTT panel (wLed)
wLed panel it's dot matrix display to show information from MQTT topics. It's well integrated with home automation systems like Home-assistant, domoticz and others through MQTT broker.
Ingredients:
- Dot matrix display MAX7219: https://aliexpress.ru/item/32618155357.html
- WeMos D1 Mini (esp8266): https://aliexpress.ru/item/32651747570.html
Algoritm of work
The display has booting and connecting to wifi, then the display subscribe to MQTT topics and publishing message "up" in MQTT topic wled/status
MQTT topics:
wled/zone0_text- main text for zone0wled/zone1_text- sight zone (left segment sun in demo picture ^)wled/intensity- display brightnes [0-15], default 5wled/scrolleffect- number of scroll effect for zone0, both effect for entry and exit text [send only number, not effect name]wled/scrolleffect_without_exit- number scroll effect for zone 0, only entry effect, the text will not go out and still stay on display until new text coming [send only number, not effect name]
Scroll effect list;
PA_RANDOM, // 0
PA_PRINT,
PA_SCAN_HORIZ,
PA_SCROLL_LEFT, // 3
PA_WIPE,
PA_SCAN_VERTX,
PA_SCROLL_UP_LEFT, // 6
PA_SCROLL_UP,
PA_FADE,
PA_OPENING_CURSOR, // 9
PA_GROW_UP,
PA_SCROLL_UP_RIGHT,
PA_BLINDS, // 12
PA_CLOSING,
PA_GROW_DOWN,
PA_SCAN_VERT, // 15
PA_SCROLL_DOWN_LEFT,
PA_WIPE_CURSOR,
PA_SCAN_HORIZX, // 18
PA_DISSOLVE,
PA_MESH,
PA_OPENING, // 21
PA_CLOSING_CURSOR,
PA_SCROLL_DOWN_RIGHT,
PA_SCROLL_RIGHT, // 24
PA_SLICE,
PA_SCROLL_DOWN, // 26
Flash esp8266 (WeMos D1):
First need to change config section in file pixel_led_mqtt_panel.ino:
// Wifi settings //
const char* WIFI_ssid = "your_wifi_network_name";
const char* WIFI_password = "change_me";
// OTA updates settings //
const char* OTA_hostname = "wLed-panel-01";
const char* OTA_password = "change_me";
// MQTT settings //
const char* mqtt_server = "192.168.1.250";
const char* mqtt_user = "mqtt_user";
const char* mqtt_password = "change_me";
// Parola display settings //
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW // type of device hardware https://majicdesigns.github.io/MD_MAX72XX/page_hardware.html
#define MAX_DEVICES 8 // number of device segments
// Display pinout //
#define DATA_PIN D7 // WeMos D1 mini GPIO13
#define CS_PIN D6 // WeMos D1 mini GPIO12
#define CLK_PIN D5 // WeMos D1 mini GPIO14
Optional
If you have display with different count of segments you need to change zones in config before flashing
In file pixel_led_mqtt_panel.ino:
#define MAX_DEVICES 8 // number of device segments
void setup() {
setup_serial();
P.begin(2);
P.setZone(0, 0, 6); // P.setZone(zone_number,start_segmet,end_segment)
P.setZone(1, 7, 7); // P.setZone(zone_number,start_segmet,end_segment)
Then configure automation in Home Asisstant to send temperature to display:
---
- alias: Outside temp change - send new temp to wled panel mqtt
initial_state: 'on'
trigger:
platform: state
entity_id: sensor.outside_thp_sensor_3
action:
- service: mqtt.publish
data:
topic: wled/zone0_text
payload_template: "{{ states('sensor.outside_thp_sensor_3') }} C"
- alias: wled panel ON mqtt - send outside temp mqtt
initial_state: 'on'
trigger:
platform: mqtt
topic: wled/status
action:
- delay: "00:00:03"
- service: mqtt.publish
data:
topic: wled/scrolleffect
payload_template: "9"
- service: mqtt.publish
data:
topic: wled/zone0_text
payload_template: "MQTT ok"
- delay: "00:00:03"
- service: mqtt.publish
data:
topic: wled/zone0_text
payload_template: "HA ok"
- delay: "00:00:03"
- service: mqtt.publish
data:
topic: wled/scrolleffect_without_exit
payload_template: "26"
- service: mqtt.publish
data:
topic: wled/zone0_text
payload_template: "{{ states('sensor.outside_thp_sensor_3') }} C"
- service: mqtt.publish
data:
topic: wled/zone1_text
payload: "s"