Temperature Sensors¶
ArduPilot supports up to nine individual temperature sensors with I2C interfaces:
In addition, analog temperature monitors can be used.
ArduPilot already has numerous possible sources for temperature reports: ESCs, Smart Batteries, Motor EFI and these independent sensors can be used to replace those devices temperature reports which already exist in ArduPilot. They can also just be logged.
I2C Sensor Setup¶
Attach sensor to one of the autopilot’s I2C ports using SDA and SCL pins. Then set (examples shown for first sensor):
TEMP1_TYPE = 0:Disabled, 1:TSYS01, 2:MCP9600, 3:MAX31865, 4: TSYS03 Sensor type
TEMP1_BUS = 0-3 Board’s I2C port on which the sensor is attached
TEMP1_ADDR = the sensor’s I2C address (0-127)
TEMP1_SRC = which other temperature reporting device type should have its temperature report replaced with this sensor’s.
TEMP1_SRC_ID = this identifies which individual device, of the above type, should have its report replaced.
Analog Sensor Setup¶
Atttch the sensor to an analog input pin. The pin number can be determined from the autopilot’s wiki page. Then set (examples shown for first sensor):
TEMP1_TYPE = 5 : Analog
TEMP1_PIN = the analog pin number (for example: 2:Pixhawk/Pixracer/Navio2/Pixhawk2_PM1, 5:Navigator, 13:Pixhawk2_PM2/CubeOrange_PM2, 14:CubeOrange, 16:Durandal, 100:PX4-v1, etc.)
The output voltage vs temperature curve of the sensor can be adjusted to match its characteristic via an up to 4th order polynomial (deg = a0 + a1*voltage + a2*voltage^2 + a3*voltage^3 + a4*voltage^4) :
Logging¶
TEMP_LOG = 0: No logging, 1: Log temperature reports from all temperature sensors