Created Calibration (markdown)

Calibration.md

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+# Manual Calibration:
+
+Setting the type of input:
+* If you don't need an input, disable it by setting INPUT1_TYPE or INPUT2_TYPE to 0, it will be ignored
+* For normal potis, set INPUT1_TYPE or INPUT2_TYPE to 1
+* For middle resting potis, set INPUT1_TYPE or INPUT2_TYPE to 2
+
+Setting Minimum, Middle and Maximum position:
+* Connect FTDI RX to blue wire from right sensor board cable to read USART DEBUG values, baud rate should be 38400
+* Turn the potis to minimum position, write value 1: to **INPUT1_MIN** and value 2: to **INPUT2_MIN** in config.h
+* Turn the potis to maximum position, write value 1: to **INPUT1_MAX** and value 2: to **INPUT2_MAX** in config.h
+* For middle resting potis, let the potis in the middle resting position, write value 1: to **INPUT1_MID** and value 2: to **INPUT2_MID**
+
+Config.h values will be ignored if you have already used the auto-calibration procedure below.
+
+# Auto-calibration:
+Auto-calibration finds the minimum, middle and maximum values for inputs.
+It also identifies the type of input and checks if it can be protected (ADC only).
+
+* Press the power button for more than 5 sec and release after the beep sound
+* Move the potis freely to the min and max limits repeatedly
+* Release potis to the resting position
+* Press the power button to confirm or wait for the 20 sec timeout
+
+If you haven't moved one of the inputs, it's floating or grounded, it will be identified as inactive and ignored.
+If min and mid values are close, the inputs will be identified as normal potis.
+Otherwise the inputs will be identified as middle resting potis.
+
+⚠The limits will be stored in flash memory and will be erased only if you fully delete memory before flashing.<br />
+An alternative to bypass those limits is to change **FLASH_WRITE_KEY** in config.h to a value different than 0x1234.