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xro:eh2024_badge_homeassistant_esp32 [2024-10-17 02:10] xro created |
xro:eh2024_badge_homeassistant_esp32 [2024-10-17 02:32] (current) xro |
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| ==== Goal ==== | ==== 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 ==== | ==== HowTo ==== | ||
| + | |||
| * The badge takes 3V and about 200mA of power | * 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 | * 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 | - To do that, we use a common StepDown module and connect it's Vin and GND to 5V and GND of an ESP32 | ||
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| - for fun, we also connect the Step-Down Modules Vout to an ADC pin of the ESP32 | - 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) | - 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:20241017_002312-collage.jpg?400|}} | ||
| - | {{ :xro:eh2024_badge_esp32.svg |}} | + | Badge controllable via HomeAssistant. |
| - | {{:xro:pxl_20241016_214556255.jpg?400|}} | ||
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