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Viewing changes to test/receiver/pulse-width-x8/main.ino

  • Committer: Tim Marston
  • Date: 2013-11-27 20:16:06 UTC
  • Revision ID: tim@ed.am-20131127201606-ijpo0x0snjfoi6be
test/receiver/pulse-width-x8: updated comments and removed unused variable

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test/receiver/pulse-width-x8/main.ino
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// available, reading the analogue outputs is certainly more portable.  So, we
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// are multiplexing the separate channels to two streams of pulses, like this:
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//
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//     ch.1  ch.3  ch.5  ch.7  ch.2  ch.4  ch.6  ch.8
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//       |     |     |     |     |     |     |     |
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//       ▼     ▼     ▼     ▼     ▼     ▼     ▼     ▼
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//       ¯     ¯     ¯     ¯     ¯     ¯     ¯     ¯
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//       |     |     |     |     |     |     |     |
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//       '-----+-----+-----+     +-----+-----+-----'
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//                         |     |
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//    ____________________ | ___ | _____________________
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//                         |     |
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//         (int. 0) pin 2  o     o  pin 3 (int. 1)
 
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//                  ch1  ch3  ch5  ch7  ch2  ch4  ch6  ch8
 
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//                   |    |    |    |    |    |    |    |
 
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//                   ▼    ▼    ▼    ▼    ▼    ▼    ▼    ▼
 
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//                   ¯    ¯    ¯    ¯    ¯    ¯    ¯    ¯
 
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//            ___    |    |    |    |    |    |    |    |     ___
 
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//    GND ---|___|---+----+----+----+    +----+----+----+----|___|--- GND
 
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//             R                    |    |                     R
 
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//             ____________________ | __ | _____________________
 
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//                                  |    |
 
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//                           pin 2  o    o  pin 3
 
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//                    (interrupt 0)        (interrupt 1)
 
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//
 
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// The two resistors in the circuit are pull-down resistors (so, say 100kΩ).
 
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// Without them, the Arduino is unable to read the pulse wave at all.
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//
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// (Note that on our receiver, and contrary to the above diagram, the channels
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// are not actually sent in order.  Channels 2 and 3 are reversed.  To this end,
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}
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static int count_ = 0, good_ = 0;
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bool read_channels( unsigned long channel_values[] )
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{
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        static unsigned long last_pulse_down = 0;