Differences

This shows you the differences between two versions of the page.

--- xro:eh2024_badge_homeassistant_esp32 [2024-10-17 00:10] – created xro
+++ xro:eh2024_badge_homeassistant_esp32 [2025-11-09 09:25] (current) – external edit 127.0.0.1
@@ Line 3: / Line 3: @@
 ==== Goal ====
-- Control the brightness and activity of the beautiful EH2024 Badge via Homeassistant
+  * Control the brightness and activity of the beautiful EH2024 Badge via Homeassistant
-- which means, controlling it via esphome from an ESP module
+    * which means, controlling it via esphome from an ESP module
-- which means, controlling it's supply voltage
+    * which means, controlling it's supply voltage
 ==== HowTo ====
   * The badge takes 3V and about 200mA of power
   * It still works with about 1.8V where it takes about 50mA but has almost no activity and is very dark
-  *which is perfect, so we can control it's activity by controlling it's supply voltage
+  * which is perfect, so we can control it's activity by controlling it's supply voltage
+Basically we want to trick the step-down module to generate less output by changing the feedback voltage it sees by generating an offset voltage using the ESP32's DAC.
+{{ :xro:eh2024_badge_esp32.svg |}}
   - To do that, we use a common StepDown module and connect it's Vin and GND to 5V and GND of an ESP32
@@ Line 19: / Line 24: @@
   - for fun, we also connect the Step-Down Modules Vout to an ADC pin of the ESP32
   - let's make sure the DAC output is 0V and re-measure the Step-Down Output and re-adjust it's poti so the output is exactly 3V (or a bit more if you want it brighter)
-    - we are done
+  - Flash the ESP32 with esphome
+  - we are done
+{{:xro:pxl_20241016_214556255.jpg?400|}}
+=== Resources ===
+  * [[https://github.com/btittelbach/esphome_config_examples/blob/main/eh_badge_power_indicator.yaml|ESPhome Example YAML]]
+  * [[https://www.analog.com/en/resources/technical-articles/digital-adjustment-of-dcdc-converter-output-voltage-in-portable-applications.html|Helpful Document explaining different options of controlling power supply voltage]]
+==== Result ====
 {{:xro:20241017_002312-collage.jpg?400|}}
-{{ :xro:eh2024_badge_esp32.svg |}}
+Badge controllable via HomeAssistant.
-{{:xro:pxl_20241016_214556255.jpg?400|}}