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+# 
+
+# Function Reference
+
+## Utility
+
+### `print(msg)`
+
+Print a line of text to the ECU's log.
+
+- Parameters
+  - `msg`: The message to print.  Pass a string or number and it will be printed to the log.
+- Returns
+  - none
+
+#### Usage example
+
+Program:
+```
+n = 5.5
+print('Hello Lua, number is: ' ..n)
+```
+Output:
+`Hello Lua, number is 5.5`
+
+### `table3d(tableIdx, x, y)`
+
+Looks up a value from the specified FSIO table.
+
+- Parameters
+  - `tableIdx`: Index of the table to use.  Currently 4 tables are supported, so indices 0, 1, 2, and 3 are valid.
+  - `x`: X-axis value to look up in the table (this is often RPM)
+  - `y`: Y-axis value to look up in the table (this is often load)
+- Returns
+  - A number representing the value looked up from the table.
+
+## Input
+
+### `getSensor(index)`
+
+Reads the specified sensor.
+
+- Parameters
+  - `index`: Index of the sensor to read.  [A list of sensor indices can be found here.](https://github.com/rusefi/rusefi/blob/master/firmware/controllers/sensors/sensor_type.h)
+- Returns
+  - A reading from the sensor, or `nil` if the sensor has a problem or isn't configured.
+
+### `getSensorRaw(index)`
+
+Reads the raw value from the specified sensor.  For most sensors, this means the analog voltage on the relevant input pin.
+
+- Parameters
+  - `index`: Index of the sensor to read.  [A list of sensor indices can be found here.](https://github.com/rusefi/rusefi/blob/master/firmware/controllers/sensors/sensor_type.h)
+- Returns
+  - The raw value that yielded the sensor reading, or 0 if the sensor doesn't support raw readings, isn't configured, or has failed.
+
+### `getAnalog(index)`
+
+Reads an analog voltage from one of the FSIO ADC inputs.
+
+- Parameters
+  - `index`: The index of the configured analog input to read. Currently 4 inputs are supported, so values of 0, 1, 2, 3 are valid for this parameter.
+- Returns
+  - The raw analog voltage from the input pin. Most rusEFI ECUs can measure between 0 and 5 volts, so this value will be a number between 0 and 5.
+
+### `getDigital(index)`
+
+Reads a digital input from the specified channel.
+
+- Parameters
+  - `index`: The index of the digital channel to read.  See table below for values.
+- Returns
+  - A boolean value representing the state of the input pin.  `true` = high voltage (above ~2 volts), `false` = low voltage (below ~3 volts)
+
+Valid `index` parameter values:
+
+| Index | Channel Name |
+| --- | ---:|
+| 0 | Clutch down switch |
+| 1 | Clutch up switch |
+| 2 | Brake switch |
+| 3 | AC switch |
+
+
+## Output
+
+coming soon...
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