Pytrack and GPS Balloon mode
For a stratospheric balloon project, I'm going to ship a Pytrack card.
But for the I76 GPS to operate at high altitude, it is necessary to activate the "balloon mode" :
Therefore, send a frame $PMTK886,32B <CR> <LF> and wait for the answer $PMTK001,886,336.
Has any of you tested and managed to send a frame to the Pytrack GPS module so that I do not start from scratch?
Thanks for your help
@brunos: I think the application note of the gps ( there is one regarding i2c) mentioned to perform a dummy write like this. But I dont have that at hand right now...
Thank you for the quick reply !
I tested and I saw well the answer in the flow of the frames.
What is the purpose of the line :
class L76GNSS: def __init__(self, py=None, sda='P22', scl='P21', writer=None): if py is not None: self.i2c = py.i2c else: from machine import I2C self.i2c = I2C(0, mode=I2C.MASTER, pins=(sda, scl)) GPS_CONFIG = b'$PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28\r\n' self.i2c.writeto(GPS_I2CADDR, GPS_CONFIG) self.i2c.writeto(GPS_I2CADDR, bytes()) ....
That is what I added in the init method to restrict sentence output. Be sure to have the correct checksum.