Add cash display

cash.yaml

@@ -0,0 +1,84 @@
+# Hardware: https://docs.thingpulse.com/guides/espaper-plus-kit/
+#
+# Programming via serial requires a serial converter. To program, the device has to be put in a
+# programming mode. This is done by pressing the RESET (the rightmost) button while holding the
+# middle button. But after setting up esphome and the WiFi credentials you can just keep flashing
+# via OTA. After flashing via any method, you must do a manual reset.
+
+# Epaper display that displays the amount of cash tracked by RevBank.
+
+esphome:
+  name: espaper
+  friendly_name: Cash
+
+esp8266:
+  board: nodemcu
+
+
+logger:
+
+wifi:
+  ssid: !secret wifi_ssid
+  password: !secret wifi_password
+
+ota:
+  platform: esphome
+  password: !secret ota_password
+
+mqtt:
+  broker: !secret mqtt_server
+
+sensor:
+  - platform: wifi_signal
+    name: "WiFi Signal dB"
+    update_interval: 10s
+    state_topic: bitlair/esphome/spacestate-bitlair/wifi_signal
+    retain: false
+  - platform: mqtt_subscribe
+    id: cash
+    topic: bitlair/bank/cash
+    on_value:
+      then:
+        - component.update: epaper
+
+text_sensor:
+  - platform: version
+    name: "ESPHome Version"
+    hide_timestamp: true
+    state_topic: bitlair/esphome/cash/version
+
+font:
+  - file: "gfonts://Roboto"
+    id: font_label
+    size: 32
+  - file: "gfonts://Roboto"
+    id: font_cash
+    size: 56
+
+spi:
+  clk_pin: 14
+  mosi_pin: 13
+
+display:
+  - platform: waveshare_epaper
+    id: epaper
+    model: 2.90in
+    cs_pin: 15
+    dc_pin: 5
+    busy_pin: 4
+    reset_pin: 2
+    update_interval: 60s
+    rotation: 270
+    lambda: |-
+      char label[32];
+      snprintf(label, sizeof(label), "geld in kas");
+      int label_w, label_h, _;
+      const int label_y = 10;
+      id(font_label).measure(label, &label_w, &_, &_, &label_h);
+      it.printf(it.get_width()/2 - label_w/2, label_y, id(font_label), "%s", label);
+
+      char cash_str[16];
+      snprintf(cash_str, sizeof(cash_str), "€ %.02f", id(cash).state);
+      int cash_w;
+      id(font_cash).measure(cash_str, &cash_w, &_, &_, &_);
+      it.printf(it.get_width()/2 - cash_w/2, label_y+label_h+2, id(font_cash), "%s", cash_str);