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ESPHome -- Scroll LCD Display Lines
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| substitutions: | |
| lcd_width: '16' | |
| lcd_height: '2' | |
| scroll_speed: 1s | |
| line_1: 'Long line that we want to scroll' | |
| line_2: 'Another long line that does not fit on the screen' | |
| display: | |
| - platform: lcd_gpio | |
| dimensions: ${lcd_width}x${lcd_height} | |
| data_pins: | |
| - D0 | |
| - D1 | |
| - D2 | |
| - D3 | |
| enable_pin: D6 | |
| rs_pin: D5 | |
| id: lcd | |
| update_interval: $scroll_speed | |
| lambda: |- | |
| static int p1 = 0; | |
| static int p2 = 0; | |
| // These lines could instead come from something like a text sensor. | |
| char* line1 = "$line_1"; | |
| int length1 = strlen(line1); | |
| if (length1 > $lcd_width) length1 = $lcd_width; | |
| const char* line2 = "$line_2"; | |
| int length2 = strlen(line2); | |
| if (length2 > $lcd_width) length2 = $lcd_width; | |
| int spacesLength = length1 >= $lcd_width ? 0 : $lcd_width - length1 + 1; | |
| char spaces[spacesLength]; | |
| for (int i = 0; i < spacesLength - 1; i++) spaces[i] = ' '; | |
| spaces[spacesLength - 1] = '\0'; | |
| it.printf("%.*s%s%.*s", length1, line1 + p1, spaces, length2, line2 + p2); | |
| p1++; | |
| if(p1 > (int)strlen(line1) - $lcd_width) { | |
| p1 = 0; | |
| } | |
| p2++; | |
| if(p2 > (int)strlen(line2) - $lcd_width) { | |
| p2 = 0; | |
| } | |
@clutch70 Thanks for the heads-up. I get my values from text sensors, so I guess that's why I didn't see it break. I updated the gist with your suggestion.
Thanks for the code @cnorick
I've been hacking at this for a while to get it to show some data from text sensors but am hitting issues with converting to string/int/char etc.
Could you post your code for using a text sensor? Keen to see where I am going wrong.
Hey @steveisaguy, here is my whole configuration where I use the scrolling LCD. I haven't used this device in a while, so there's a chance it will no longer work after some of the new ESPHome updates. Good luck with it!
substitutions:
lcd_width: '16'
lcd_height: '2'
scroll_speed: 1s
esphome:
name: meeting-status-board
platform: ESP8266
board: nodemcuv2
# Enable logging
logger:
level: DEBUG
# Enable Home Assistant API
api:
ota:
password: !secret ota_password
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Meeting-Status-Board"
password: !secret ap_password
captive_portal:
text_sensor:
- platform: homeassistant
id: meeting_title
entity_id: calendar.work
attribute: message
name: "Meeting Title"
disabled_by_default: true
- platform: homeassistant
id: meeting_start
entity_id: calendar.work
attribute: start_time
name: "Meeting Start Time"
disabled_by_default: true
- platform: homeassistant
id: meeting_end
entity_id: calendar.work
attribute: end_time
name: "Meeting End Time"
disabled_by_default: true
- platform: template
name: "Current Light"
lambda: |-
if (id(in_meeting).state) {
return {"red"};
}
else if (id(meeting_started).state) {
return {"yellow"};
}
else {
return {"green"};
}
update_interval: 5s
id: current_light
disabled_by_default: true
on_value:
then:
- switch.turn_off: green_light
- switch.turn_off: yellow_light
- switch.turn_off: red_light
- if:
condition:
binary_sensor.is_on: in_meeting
then:
- switch.turn_on: red_light
else:
- if:
condition:
binary_sensor.is_on: meeting_started
then:
- switch.turn_on: yellow_light
else:
- switch.turn_on: green_light
binary_sensor:
- platform: homeassistant
id: meeting_started
entity_id: calendar.work
name: "Meeting Started"
disabled_by_default: true
- platform: homeassistant
id: in_meeting
entity_id: binary_sensor.in_meeting
name: "In Meeting"
disabled_by_default: true
switch:
- platform: gpio
pin: D7
name: "Green Light"
internal: true
id: green_light
- platform: gpio
pin: D8
name: "Yellow Light"
internal: true
id: yellow_light
- platform: gpio
pin: 9
name: "Red Light"
internal: true
id: red_light
display:
- platform: lcd_gpio
dimensions: ${lcd_width}x${lcd_height}
data_pins:
- D0
- D1
- D2
- D3
enable_pin: D6
rs_pin: D5
id: lcd
update_interval: $scroll_speed
lambda: |-
static int p1 = 0;
static int p2 = 0;
char line1[$lcd_width];
char startString[$lcd_width/2];
char endString[$lcd_width/2];
struct tm start;
memset(&start, 0, sizeof(tm));
struct tm end;
memset(&end, 0, sizeof(tm));
strptime(id(meeting_start).state.c_str(), "%Y-%m-%d %H:%M:%S", &start);
strftime(startString, sizeof(startString), "%I:%M", &start);
strptime(id(meeting_end).state.c_str(), "%Y-%m-%d %H:%M:%S", &end);
strftime(endString, sizeof(endString), "%I:%M", &end);
sprintf(line1, "%s - %s", startString, endString);
int length1 = strlen(line1);
const char* line2 = id(meeting_title).state.c_str();
int length2 = strlen(line2);
if (length2 > $lcd_width) length2 = $lcd_width;
int spacesLength = length1 >= $lcd_width ? 0 : $lcd_width - length1 + 1;
char spaces[spacesLength];
for (int i = 0; i < spacesLength - 1; i++) spaces[i] = ' ';
spaces[spacesLength - 1] = '\0';
it.printf("%.*s%s%.*s", length1, line1 + p1, spaces, length2, line2 + p2);
p1++;
if(p1 > (int)strlen(line1) - $lcd_width) {
p1 = 0;
}
p2++;
if(p2 > (int)strlen(line2) - $lcd_width) {
p2 = 0;
}
Hey @steveisaguy, here is my whole configuration where I use the scrolling LCD. I haven't used this device in a while, so there's a chance it will no longer work after some of the new ESPHome updates. Good luck with it!
substitutions: lcd_width: '16' lcd_height: '2' scroll_speed: 1s esphome: name: meeting-status-board platform: ESP8266 board: nodemcuv2 # Enable logging logger: level: DEBUG # Enable Home Assistant API api: ota: password: !secret ota_password wifi: ssid: !secret wifi_ssid password: !secret wifi_password # Enable fallback hotspot (captive portal) in case wifi connection fails ap: ssid: "Meeting-Status-Board" password: !secret ap_password captive_portal: text_sensor: - platform: homeassistant id: meeting_title entity_id: calendar.work attribute: message name: "Meeting Title" disabled_by_default: true - platform: homeassistant id: meeting_start entity_id: calendar.work attribute: start_time name: "Meeting Start Time" disabled_by_default: true - platform: homeassistant id: meeting_end entity_id: calendar.work attribute: end_time name: "Meeting End Time" disabled_by_default: true - platform: template name: "Current Light" lambda: |- if (id(in_meeting).state) { return {"red"}; } else if (id(meeting_started).state) { return {"yellow"}; } else { return {"green"}; } update_interval: 5s id: current_light disabled_by_default: true on_value: then: - switch.turn_off: green_light - switch.turn_off: yellow_light - switch.turn_off: red_light - if: condition: binary_sensor.is_on: in_meeting then: - switch.turn_on: red_light else: - if: condition: binary_sensor.is_on: meeting_started then: - switch.turn_on: yellow_light else: - switch.turn_on: green_light binary_sensor: - platform: homeassistant id: meeting_started entity_id: calendar.work name: "Meeting Started" disabled_by_default: true - platform: homeassistant id: in_meeting entity_id: binary_sensor.in_meeting name: "In Meeting" disabled_by_default: true switch: - platform: gpio pin: D7 name: "Green Light" internal: true id: green_light - platform: gpio pin: D8 name: "Yellow Light" internal: true id: yellow_light - platform: gpio pin: 9 name: "Red Light" internal: true id: red_light display: - platform: lcd_gpio dimensions: ${lcd_width}x${lcd_height} data_pins: - D0 - D1 - D2 - D3 enable_pin: D6 rs_pin: D5 id: lcd update_interval: $scroll_speed lambda: |- static int p1 = 0; static int p2 = 0; char line1[$lcd_width]; char startString[$lcd_width/2]; char endString[$lcd_width/2]; struct tm start; memset(&start, 0, sizeof(tm)); struct tm end; memset(&end, 0, sizeof(tm)); strptime(id(meeting_start).state.c_str(), "%Y-%m-%d %H:%M:%S", &start); strftime(startString, sizeof(startString), "%I:%M", &start); strptime(id(meeting_end).state.c_str(), "%Y-%m-%d %H:%M:%S", &end); strftime(endString, sizeof(endString), "%I:%M", &end); sprintf(line1, "%s - %s", startString, endString); int length1 = strlen(line1); const char* line2 = id(meeting_title).state.c_str(); int length2 = strlen(line2); if (length2 > $lcd_width) length2 = $lcd_width; int spacesLength = length1 >= $lcd_width ? 0 : $lcd_width - length1 + 1; char spaces[spacesLength]; for (int i = 0; i < spacesLength - 1; i++) spaces[i] = ' '; spaces[spacesLength - 1] = '\0'; it.printf("%.*s%s%.*s", length1, line1 + p1, spaces, length2, line2 + p2); p1++; if(p1 > (int)strlen(line1) - $lcd_width) { p1 = 0; } p2++; if(p2 > (int)strlen(line2) - $lcd_width) { p2 = 0; }
This looks like a cool project, do you have a photo on how the project looks. Seems you used it for a meeting room display
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For the copy pasters out there in the world like me, it would seem as though an update or something has changed the required syntax for this to work. I kept getting errors at lines 25 and 29 because the compiler wasn't getting the quotes from the substitution so it couldn't tell it was a string. Adding my own quotes e.g. below did the trick.
char* line1 = "$line_1"; //and
const char* line2 = "$line_2";