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MeterDemo/README.md
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@ -8,3 +8,24 @@ I borrowed the BIT MAP data from [here](https://forum.arduino.cc/t/analog-vu-met
This sample shows how to quickly redraw a BITMAP image.
High-speed drawing is possible by converting BITMAP data to Page and Segment.
You can use ssd1306_bitmaps function as converter.
You will need an analog source to run this demo.
Connect the analog source to the following GPIO.
These are all channel 0 of ADC1.
- Analog input gpio for ESP32 is GPIO36.
- Analog input gpio for ESP32S2 is GPIO01.
- Analog input gpio for ESP32S3 is GPIO01.
- Analog input gpio for ESP32C3 is GPIO00.
Schematic I used:
```
ESP32 3V3 ----------- CDS ---+---+
| |
ESP32 Analog input ----------+ |
|
ESP32 GND ------ Register -------+
```