2014-09-15 15:40:17 -07:00
|
|
|
# Sonar
|
|
|
|
|
|
|
|
|
|
A sonar sensor can be used to measure altitude for use with altitude hold modes.
|
|
|
|
|
|
|
|
|
|
The current sensor takes over from the pressure sensor at low altitudes, but only when
|
|
|
|
|
the angle of the aircraft is small.
|
|
|
|
|
|
|
|
|
|
## Hardware
|
|
|
|
|
|
|
|
|
|
Currently the only supported sensor is the HCSR04 sensor.
|
|
|
|
|
|
|
|
|
|
## Connections
|
|
|
|
|
|
|
|
|
|
### Naze/Flip32+
|
|
|
|
|
|
|
|
|
|
| Mode | Trigger | Echo | Inline 1k resistors |
|
|
|
|
|
| ------------- | ------------- | ------------- | ------------------- |
|
|
|
|
|
| Parallel PWM | PB8 / Motor 5 | PB9 / Motor 6 | NO (5v tolerant) |
|
|
|
|
|
| PPM/Serial RX | PB0 / RC7 | PB1 / RC8 | YES (3.3v input) |
|
|
|
|
|
|
|
|
|
|
Current meter cannot be used in conjunction with Parallel PWM and Sonar.
|
|
|
|
|
|
|
|
|
|
### Olimexino
|
|
|
|
|
|
|
|
|
|
| Trigger | Echo | Inline 1k resistors |
|
|
|
|
|
| ------------- | ------------- | ------------------- |
|
|
|
|
|
| PB0 / RC7 | PB1 / RC8 | YES (3.3v input) |
|
|
|
|
|
|
|
|
|
|
Current meter cannot be used in conjunction sonar.
|
