Now that we know the connections, let's hook up the PmodGPS to the chipKIT WF32. Then of course we have the ground and 3.3V lines to power the module. Pin 4 is called 1PPS which drives the line high for 100ms then low for 900ms and repeats this process (honestly not sure what the point of it is). The second and third pins are the RX and TX lines that actually transmit the information to our board. When the module has a constant fix, the pin stays low and if the module is unable to get a fix then the pin will toggle every second. ![]() The first is labeled 3DF which indicates the status of the user's positional fix. Now let's take a look at the PmodGPS data sheet here. There are also many UART connections that only have RX and TX connections.Īn important thing to note about UART connections is that the RX from one board connects to the TX of the other and vice-versa. The RX and TX lines are the ones that actually transmit and receive data so in most cases you can tie RTS and CTS to ground (or sometimes you can even leave them floating). UART connections have 4 data channels: RTS "Ready to Send", RX "Receive", TX "Transmit", and CTS "Clear to Send".
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