Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
xro:eh2024_badge_homeassistant_esp32 [2024-10-17 02:13] xro |
xro:eh2024_badge_homeassistant_esp32 [2024-10-17 02:32] (current) xro |
||
|---|---|---|---|
| Line 9: | Line 9: | ||
| ==== HowTo ==== | ==== HowTo ==== | ||
| - | {{ :xro:eh2024_badge_esp32.svg |}} | ||
| * 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 | ||
| Line 29: | Line 32: | ||
| * [[https://github.com/btittelbach/esphome_config_examples/blob/main/eh_badge_power_indicator.yaml|ESPhome Example YAML]] | * [[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 ==== | ==== Result ==== | ||
realraum Graz, Brockmanngasse 15, 8010 Graz, realraum - Verein für Technik in Kultur und Gesellschaft