Hi,
Im using Pi Zero v1.1 and waveshare GNSS Hat.
I wanted to create an NTP server through Chrony, that pulls time from GPS/GNSS and this server to act as a central time provider to local other systems (esp32 / Stm32 controllers).
My initial approach was to connect the hat over GPIO and pull GPS signals from the GPIO. Later i got pointed out that my PPS wasnt connected to any gpio.
so i tried to make modifications to the board,
1. remove the hard switch from the board and add a transistor, so i can send a pulse from the GPIO to turn on the Hat. (need help in deciding a transistor)
2. Since PPS wasnt having any GPIO Connection, i removed the LED on board and traced the line. added a wire so i can connect it to a GPIO. During this process i messed up really bad with the GPIO slot. Now im unable to used or place the HAT over pi Zero. So bought a microusb to microusb male cable and connected the pi with the hat using usb cable.
I listed out the device using `lsusb` and `dmesg` and found `/dev/ttyUSB0` to be the one.
Now, when i bring tio/minicom with `/dev/ttyUSB0` its not working.
Problems with this version of GNSS Hat:
1. The board i have is a older version (without software turn on option through GPIO).
2. No dedicated PPS line over GPIO.
3. I broke my hats GPIO connector and only possible way is using USB cable.
Need help in
1. see some gps signal using the usb cable
2. Configure Chrony to look at this device connected through USB
3. Decide which transistor can be used to turn on the board over GPIO instead of hard switch
Im using Pi Zero v1.1 and waveshare GNSS Hat.
I wanted to create an NTP server through Chrony, that pulls time from GPS/GNSS and this server to act as a central time provider to local other systems (esp32 / Stm32 controllers).
My initial approach was to connect the hat over GPIO and pull GPS signals from the GPIO. Later i got pointed out that my PPS wasnt connected to any gpio.
so i tried to make modifications to the board,
1. remove the hard switch from the board and add a transistor, so i can send a pulse from the GPIO to turn on the Hat. (need help in deciding a transistor)
2. Since PPS wasnt having any GPIO Connection, i removed the LED on board and traced the line. added a wire so i can connect it to a GPIO. During this process i messed up really bad with the GPIO slot. Now im unable to used or place the HAT over pi Zero. So bought a microusb to microusb male cable and connected the pi with the hat using usb cable.
I listed out the device using `lsusb` and `dmesg` and found `/dev/ttyUSB0` to be the one.
Now, when i bring tio/minicom with `/dev/ttyUSB0` its not working.
Problems with this version of GNSS Hat:
1. The board i have is a older version (without software turn on option through GPIO).
2. No dedicated PPS line over GPIO.
3. I broke my hats GPIO connector and only possible way is using USB cable.
Need help in
1. see some gps signal using the usb cable
2. Configure Chrony to look at this device connected through USB
3. Decide which transistor can be used to turn on the board over GPIO instead of hard switch
Statistics: Posted by tesarect — Sat Feb 01, 2025 7:13 am