Differences

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--- xro:eh2024_badge_homeassistant_esp32 [2024-10-17 00:13] – xro
+++ xro:eh2024_badge_homeassistant_esp32 [2025-11-09 09:25] (current) – external edit 127.0.0.1
@@ Line 9: / Line 9: @@
 ==== HowTo ====
-{{ :xro:eh2024_badge_esp32.svg |}}
   * 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 29: / Line 32: @@
   * [[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 ====