Edit TidBit: BN-220/BN-880 GPS Module

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The BN-220 and BN-880 both talk via UART. The BN-880 is almost the same as the BN-220 except for its physical size and it has two additional pins for I2C communications for a compass module that is not present in the BN-220. Both use the NMEA GPS protocol but defaults to 9600bps instead of the NMEA standard 4800bps. The BN-220/880 GPS modules can use GPS, GLONASS, Galileo, BeiDou, and SBAS signals. When powered on, the module repeatedly sends comma-delimited output phrases one line at a time. Each line starts with a $ and ends with \r\n. The signal used and type of data is identified by a five character string, for example GPGGA. The first two characters define the system being used to get position (Talker ID): (GP=GPS, GA=Galileo, GB=BeiDou, GL=GLONASS, GN=GPS+GLONASS). The last three identify the kind of signal (GGA=GPS fix data, GLL=position data, GRS=GPS range residuals, GSA=GPS DOP and active satellites, GST=GPS PRN, GSV=GPS satellites in view, GGK=Time/position/position type/DOP, as well as some others) If power is lost and there is a backup battery with enough charge, the module will use its onboard RTC to keep track of time until power is restored and a signal is received. The following is a simple Micropython program that reads a BN-220/880 connected to UART0 on a Raspberry Pi Pico RP2040, and prints the GNGGA data (GPS+GLONASS position fix) <nowiki> from machine import Pin, UART import time import gc uart = UART(1, baudrate=9600, tx=Pin(4), rx=Pin(5)) rxData = bytes() rxDataFull = bytearray() rxDataConv = "" rxDataString = "" rxDataList = [] while True: while uart.any() > 0: rxData = uart.read(1) if(rxData == b'$'): rxDataFull = ([]) if(rxData == b'\r'): dataStringCount = len(rxDataFull) for i in range(0, dataStringCount, 1): rxDataString = rxDataString + chr(rxDataFull[i]) if((rxDataString[0:6]) == "$GNGGA"): rxDataList = rxDataString.split(',') # For GNGGA, time is in element 1, Lat: 2&3, Long: 4&5, Alt: 9&10 try: print("Time: {}:{}:{}".format((str(rxDataList[1])[0:2]), (str(rxDataList[1])[2:4]), (str(rxDataList[1])[4:6]))) print("Lat: {}d {}m {}".format((str(rxDataList[2])[0:2]), (str(rxDataList[2])[2:10]), rxDataList[3])) print("Long: {}d {}m {}".format((str(rxDataList[4])[0:3]), (str(rxDataList[4])[3:11]), rxDataList[5])) print("Altitude: {}{}".format(rxDataList[9], rxDataList[10])) except IndexError: print("NO DATA") print("**********") gc.collect() print("Free heap: ",gc.mem_free()) print("**********") rxDataString = "" rxDataList = [] time.sleep(0.05) else: rxDataFull += rxData </nowiki>

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