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feat: automatic brightness adjustment
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s3lph 2024-03-02 19:08:16 +01:00
parent 5977c7ab98
commit a077f2e7e7
Signed by: s3lph
GPG key ID: 0AA29A52FB33CFB5
3 changed files with 32 additions and 5 deletions
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13
README.md
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@ -95,3 +95,16 @@ Leaving...
Hard resetting via RTS pin... Hard resetting via RTS pin...
=================================================== [SUCCESS] Took 23.76 seconds ==================================================== =================================================== [SUCCESS] Took 23.76 seconds ====================================================
``` ```
## Automatic Brightness Adjustment
You can attach a voltage divider with a photo resistor as pull-down and a regular resistor as pull-up to the ESP's8266 ADC.
If you choose to do this, please check the ADC voltage level of your ESP8266 board: While the ADC itself works in the range 0.0V...1.0V, a lot of breakout boards scale that up to 0.0V...3.3V.
Example with a NodeMCU board:
![brightness.png][brightness.png]
You can use the values `ADC_MAX`, `ADC_MIN`, `BRIGHT_MIN` and `BRIGHT_MAX` at the top of the file `esp/src/main.cpp` to fine-tune the sensitivity and thresholds of the auto adjustment.
If you do not use this feature, and observe some flickering, please short the ADC to GND.

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24
esp/src/main.cpp
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@ -6,6 +6,11 @@
Adafruit_NeoPixel pixels(60, 5, NEO_GRB + NEO_KHZ800); Adafruit_NeoPixel pixels(60, 5, NEO_GRB + NEO_KHZ800);
uint16_t ADC_MAX = 900;
uint16_t ADC_MIN = 250;
uint8_t ADC_INVERT = 1;
uint8_t BRIGHT_MIN = 50;
uint8_t BRIGHT_MAX = 255;
const char *ssid = put your ssid here; const char *ssid = put your ssid here;
const char *password = put your psk here; const char *password = put your psk here;
@ -34,6 +39,15 @@ uint8_t sixtyToPixel(int8_t sixty) {
void loop() { void loop() {
delay(1000); delay(1000);
uint16_t brightness = analogRead(A0);
uint8_t bscale = (uint8_t) (255*(min(max(brightness, ADC_MIN), ADC_MAX) - ADC_MIN) / (ADC_MAX - ADC_MIN));
if (ADC_INVERT) {
bscale = 255 - bscale;
}
bscale = min(max(bscale, BRIGHT_MIN), BRIGHT_MAX);
Serial.print(brightness);
Serial.print(" -> ");
Serial.println(bscale);
ntp.update(); ntp.update();
Serial.println(ntp.formattedTime("%T")); Serial.println(ntp.formattedTime("%T"));
uint8_t h = sixtyToPixel((ntp.hours() % 12) * 5 + (ntp.minutes() / 12)); uint8_t h = sixtyToPixel((ntp.hours() % 12) * 5 + (ntp.minutes() / 12));
@ -42,10 +56,10 @@ void loop() {
uint8_t m = sixtyToPixel(ntp.minutes()); uint8_t m = sixtyToPixel(ntp.minutes());
uint8_t s = sixtyToPixel(ntp.seconds()); uint8_t s = sixtyToPixel(ntp.seconds());
pixels.clear(); pixels.clear();
pixels.setPixelColor(hl, pixels.getPixelColor(hl) | 0x00ff0000); pixels.setPixelColor(hl, pixels.getPixelColor(hl) | (bscale << 16));
pixels.setPixelColor(h, pixels.getPixelColor(h) | 0x00ff0000); pixels.setPixelColor(h, pixels.getPixelColor(h) | (bscale << 16));
pixels.setPixelColor(hr, pixels.getPixelColor(hr) | 0x00ff0000); pixels.setPixelColor(hr, pixels.getPixelColor(hr) | (bscale << 16));
pixels.setPixelColor(m, pixels.getPixelColor(m) | 0x0000ff60); pixels.setPixelColor(m, pixels.getPixelColor(m) | (bscale << 8) | (bscale >> 2));
pixels.setPixelColor(s, pixels.getPixelColor(s) | 0x000000ff); pixels.setPixelColor(s, pixels.getPixelColor(s) | bscale);
pixels.show(); pixels.show();
} }