Fixed RMS calculation

README.md

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+## Flashing Micropython
+
+Download the latest firmware from
+https://micropython.org/download/?port=esp8266
+(ESP8266 with 2MiB+ flash)
+
+Flash Wemos D1 mini with (note the -fm dout option)
+
+esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash -fm dout --flash_size=detect 0 esp8266-20220618-v1.19.1.bin 
+
+## Access webrepl
+
+minicom -D /dev/ttyUSB0
+
+Password for webrepl: badkamer
+
+When the program is running, webrepl is not responsive. Get the prompt >>> with Ctrl+C.
+
+
+## Flashing source code
+
+ampy --port /dev/ttyUSB0 put . /
+
+Flash Wemos D1 mini with (note the -fm dout option)
+
+esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash -fm dout --flash_size=detect 0 esp8266-20220618-v1.19.1.bin 
+
+
+