Multiwii Analog
Reads the analog sensors, such as voltages and currents.
Library
MATLAB Command Line
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qc_open_library('quarc_library/Communications/Multiwii')Description
The Multiwii Analog block uses the Multiwii protocol on the input stream to read the analog sensors, such as
voltages and currents. It sends an MSP_ANALOG message and receives the reply.
This block is designed to be used with blocking I/O. It is typically used with a stream connected to a serial port. To open the stream a Multiwii Connect block should be used.
The output of the block includes the battery voltage, power meter summation, wireless signal strength (RSSI) and amperage. The battery voltage is in volts. The RSSI is expressed as a percentage between 0 and 1. The units of the power meter summation and amperage are the raw units from the device.
A copy of the stream is also output so that the Multiwii blocks may be chained together.
If an error occurs, then the block returns a negative error code at its err output. The Compare to Error block may be used to check for specific error codes. If the stream is not valid because it is not yet connected, the err output will be zero since this condition is expected and the validity of the stream may be checked using the con output of the Multiwii Connect block.
Helpful Hints
Other uses of this block
Although it is intended for use in the main diagram with the other Multiwii
blocks, the
Multiwii Analog
block may be used
with the Advanced stream blocks, even in an asynchronous thread.
Input Ports
stm
A reference to the stream created by the Multiwii Connect block. If a connection has not yet been established, then the err output of the Multiwii Analog block will be zero.
Output Ports
stm
A reference to the stream. This output is merely a copy of the stm input. Providing this output makes it much easier to establish the execution order of Multiwii blocks in the diagram because Simulink generally executes daisy-chained blocks in sequence.
vbat
A scalar representing the battery voltage in Volts.
pwr
A scalar containing the raw power meter summation from the device.
rssi
A scalar percentage representing the wireless signal strength (RSSI), where 0 is no signal and 1 is full signal strength.
amp
A scalar containing the raw amperage from the device.
err
An int32 value indicating whether the data was read successfully. This value will be positive if data was read successfully. It will be zero if data could not be read immediately. If an error occurs then this value is a negative error code. See Error Codes for the different error codes and their values. Use the Compare to Error block rather than the error code itself to check for specific error codes. To check for errors in general use the Compare to Zero block to check whether the err output is less than zero.
Parameters and Dialog Box
The Multiwii Analog block has no parameters.
Targets
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Target Name |
Compatible* |
Model Referencing |
Comments |
|---|---|---|---|
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
Last fully supported in QUARC 2018. |
|
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Rapid Simulation (RSIM) Target |
Yes |
Yes |
|
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S-Function Target |
No |
N/A |
Old technology. Use model referencing instead. |
|
Normal simulation |
Yes |
Yes |
See Also
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