Add support to tm1621 display (#3737)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

tests/test1.yaml

@@ -547,8 +547,10 @@ sensor:
   - platform: dht
     pin: GPIO26
     temperature:
+      id: dht_temperature
       name: Living Room Temperature 3
     humidity:
+      id: dht_humidity
       name: Living Room Humidity 3
     model: AM2302
     update_interval: 15s
@@ -2514,6 +2516,17 @@ display:
       it.print_sad(true);
       it.print_bracket(true);
       it.print_battery(true);
+  - platform: tm1621
+    id: tm1621_display
+    cs_pin: GPIO17
+    data_pin: GPIO5
+    read_pin: GPIO23
+    write_pin: GPIO18
+    lambda: |-
+      it.printf(0, "%.1f", id(dht_temperature).state);
+      it.display_celsius(true);
+      it.printf(1, "%.1f", id(dht_humidity).state);
+      it.display_humidity(true);
 
 tm1651:
   id: tm1651_battery