neo6m & neo7 GPS module heads up.

Discussion in 'RFinderPi - Open Source radio interface based on R' started by AD5MB, Aug 16, 2018.

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  1. AD5MB

    AD5MB Ham Member QRZ Page

    I have 2 neo 6m GPS modules, and one neo7. I thought they all had the same problem. they do, but not the problem I thought they had.

    they all lock up to GPS, give a 1 per second PPA pulse. the PPA pulse returns a nice bright shine from an external LED. if you connect TXD and RXD to LEDs, one provides a nice bright LED, the other a feeble glow.

    this is a 3.3 volt chip on a board with a regulator. you can feed it with 5 volts, but the TXD and RXD pins need 3.3. it can survive a 5 volt RXD input, but it only puts out 3.3 V from TXD. you need a logic level converter to see the output on an Arduino. the symptom is the feeble LED. TXD from the module connects to RXD on the Arduino, and vice versa.

    I rank this right up there with the malignant SOB from Ford Motor Company who put 1: 6MM X 28 threads per inch screw under the dash to hold the console in place. sick SOB probably still chuckles over the grief he caused with that.
    Last edited: Aug 16, 2018
  2. W9GB

    W9GB Ham Member QRZ Page

    YES, that configuration is common with Arduino interfaces, 3.3V I/O, 5V standard Vcc
    SparkFun DEV-09717 : FTDI Cable USB to TTL (UART) 5V Vcc - 3.3V I/O

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