Comments on: Adding a GPS Receiver to the iC880A LoRaWAN concentrator https://computenodes.net/2017/09/05/adding-a-gps-receiver-to-the-ic880a-lorawan-concentrator/ Fri, 17 Jan 2025 16:04:34 +0000 hourly 1 https://wordpress.org/?v=6.7.1 By: Phil https://computenodes.net/2017/09/05/adding-a-gps-receiver-to-the-ic880a-lorawan-concentrator/#comment-395 Wed, 13 Feb 2019 17:15:56 +0000 https://computenodes.net/?p=24#comment-395 In reply to Marek.

Hi Marek,

Glad to hear you’ve got the schematics and data needed from iMST, it sounds like you got more information from them than I did, although I never asked about the PPS issue – just worked around it.

1) I used the USB port for programming only using u-centre. I have a board between the Pi and the iC880a which connects the GPS serial pins from to the hardware serial port on the Pi.

2) I think I had to save the settings to non-volatile memory there was an option for it in u-centre.

3) I’m afraid I can’t remember that one, I suspect if I knew about the timing mode I tried setting it.

4) Yes NMEA messages go straight through the UART, there are options in u-centre to determine which type of messages get sent to which serial/ usb port.

5) As I didn’t know about the resistor options I just used a bit of jumper wire between the ublox pin and pin 19 on the header. This also means the PPS goes to the Pi so can be used for ntp purposes. I think there’s options in u-centre to configure what you want the timepulse outputs to do as well. Once u-centre is connected it gives you a lot of control.

Good luck, and I’d be interested to hear more about how you get on.

]]> By: Marek https://computenodes.net/2017/09/05/adding-a-gps-receiver-to-the-ic880a-lorawan-concentrator/#comment-394 Wed, 13 Feb 2019 17:04:15 +0000 https://computenodes.net/?p=24#comment-394 Hi Phil,
I’ve finally got a schematic from IMST. I’m clear about active antenna problem (omitting SAW filter and some R and dummy C around it). But still have few more questions:

1) Do you use the USB port on LEA only for programming in u-centre sw or also for sending NMEA MSGs (connected to RPI USB port)?

2) Is GPS setting permanent even reset power supply?

3) Have you deal with switching a TIMING mode in LEA? (has a better time accuracy)

4) NMEA MSGs go via UART directly from LEA module (pin 3 Tx and 4 Rx) to RPI UART (pin 8+10, GPIO 14+15)?

5) What about PPS signal? Since I’ve been using an external GPS module with iC880 and Raspberry, I connect the PPS signal from external GPS board to the pin19 iC880.

IMTS send me for PPS following recomm:
“For PPS purposes, there are 3 important resistors:
* R100 (typically not fitted) connects LEA-6 TimePulse2 Output to SX1280 GPS PPS input
* R101 (typically not fitted) connects LEA-6 TimePulse1 Output to SX1280 GPS PPS input
* R306 (typically fitted by 100R) connects external PPS (module pin 19 or via typically not fitted U.FL connector) to SX1280 GPS PPS input

Basically, all resistors can be fitted at the same time, but in this case you need to pay attention to avoid signal collisions. Thus we recommend to remove not required resistors and fit only one for your purposes.”

]]> By: Phil https://computenodes.net/2017/09/05/adding-a-gps-receiver-to-the-ic880a-lorawan-concentrator/#comment-380 Tue, 05 Feb 2019 09:52:49 +0000 https://computenodes.net/?p=24#comment-380 In reply to Marek, Dep. of telecommunication, technical uni.

Hi Marek, as stated above I’m not sure if they are happy with me sharing the documents so am unable to forward them on to you.

]]> By: Marek, Dep. of telecommunication, technical uni https://computenodes.net/2017/09/05/adding-a-gps-receiver-to-the-ic880a-lorawan-concentrator/#comment-378 Mon, 04 Feb 2019 19:29:23 +0000 https://computenodes.net/?p=24#comment-378 Hi Phil,
I’ve contacted IMST as you recomm but no answer so far. Pls could you send me supporting documents? It helps me a lot.
many thanks

]]> By: Raspberry Pi LoRaWAN gateway PCB – Compute Nodes https://computenodes.net/2017/09/05/adding-a-gps-receiver-to-the-ic880a-lorawan-concentrator/#comment-40 Fri, 14 Sep 2018 14:58:33 +0000 https://computenodes.net/?p=24#comment-40 […] discussed in a previous blog post the iC880a is a LoRaWAN concentrator that can be used to create a gateway. The iC880a only provides […]

]]> By: Phil https://computenodes.net/2017/09/05/adding-a-gps-receiver-to-the-ic880a-lorawan-concentrator/#comment-38 Tue, 28 Aug 2018 09:05:16 +0000 https://computenodes.net/?p=24#comment-38 Hi,

I contacted IMST support who emailed me the required document. I suggest you do the same as I’m not sure if they’d be happy with me sharing it.

]]> By: Colin https://computenodes.net/2017/09/05/adding-a-gps-receiver-to-the-ic880a-lorawan-concentrator/#comment-33 Sat, 18 Aug 2018 14:25:54 +0000 https://computenodes.net/?p=24#comment-33 Hi,
Where can I find a list of components needed for this mod?

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