2014-08-13 14:01:39 -07:00
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# Sonar
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A sonar sensor can be used to measure altitude for use with altitude hold modes.
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The current sensor takes over from the pressure sensor at low altitudes, but only when
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the angle of the aircraft is small.
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## Hardware
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Currently the only supported sensor is the HCSR04 sensor.
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## Connections
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2014-08-13 14:04:48 -07:00
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### Naze/Flip32+
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2014-08-13 14:01:39 -07:00
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| Mode | Trigger | Echo | Inline 1k resistors |
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| ------------- | ------------- | ------------- | ------------------- |
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| Parallel PWM | PB8 / Motor 5 | PB9 / Motor 6 | NO (5v tolerant) |
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| PPM/Serial RX | PB0 / RC7 | PB1 / RC8 | YES (3.3v input) |
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Current meter cannot be used in conjunction with Parallel PWM and Sonar.
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### Olimexino
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| Trigger | Echo | Inline 1k resistors |
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| ------------- | ------------- | ------------------- |
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| PB0 / RC7 | PB1 / RC8 | YES (3.3v input) |
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Current meter cannot be used in conjunction sonar.
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