Comments for Compute Nodes https://computenodes.net Fri, 17 Jan 2025 16:04:34 +0000 hourly 1 https://wordpress.org/?v=6.7.1 Comment on Interfacing a K30 CO2 sensor with a Raspberry Pi for Remote Air Quality Sensing by Phil https://computenodes.net/2017/08/18/__trashed-4/#comment-615 Thu, 17 Dec 2020 11:48:25 +0000 https://computenodes.net/?p=50#comment-615 Hi Antares,

I’m afraid I don’t have access to a sensor to test but I think it’s probably line 17 that is causing you grief.
I think all you need to do to fix this line is change it to
ser.write(b”\xFE\x44\x00\x08\x02\x9F\x25″)
Lines 24 & 25 may also need changing, but without the hardware I can’t test.

]]> Comment on Interfacing a K30 CO2 sensor with a Raspberry Pi for Remote Air Quality Sensing by Antares Fixter https://computenodes.net/2017/08/18/__trashed-4/#comment-614 Wed, 16 Dec 2020 18:52:00 +0000 https://computenodes.net/?p=50#comment-614 Perfect! Great job!
but I don’t know how to convert this code for Python3 (unicode is not supported)

]]> Comment on Interfacing a K30 CO2 sensor with a Raspberry Pi for Remote Air Quality Sensing by sandar win https://computenodes.net/2017/08/18/__trashed-4/#comment-517 Tue, 23 Jun 2020 06:14:43 +0000 https://computenodes.net/?p=50#comment-517 Fantastic! Thanks a lot, sir!

]]> Comment on EMF camp 2018 Air Quality LoRaWAN workshop by Phil https://computenodes.net/2018/09/05/emf-camp-2018-air-quality-lorawan-workshop/#comment-429 Wed, 13 Mar 2019 11:27:28 +0000 https://computenodes.net/?p=285#comment-429 In reply to Johannes Rebling.

Hi Johannes,

Glad you found the workshop interesting, Flo will continue to follow this up with you via email.

]]> Comment on EMF camp 2018 Air Quality LoRaWAN workshop by Johannes Rebling https://computenodes.net/2018/09/05/emf-camp-2018-air-quality-lorawan-workshop/#comment-419 Sun, 10 Mar 2019 10:13:30 +0000 https://computenodes.net/?p=285#comment-419 Hi,

a few colleagues of mine and I are planning a three day workshop at our university in Zurich. The plan is teach our life-science friends and fellow PhD students some techniques to make their every-day lab work easier. We will have some hands-one courses on electronics and mechanical design in the first two days and will finish with a day on advanced topics. The project/workshop you describe here sounds fascinating and I would like to get in touch with the authors. However, I was not able to find an email address, so it would be great if you could send me a message.

]]> Comment on Adding a GPS Receiver to the iC880A LoRaWAN concentrator 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.

]]> Comment on Adding a GPS Receiver to the iC880A LoRaWAN concentrator 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.”

]]> Comment on Adding a GPS Receiver to the iC880A LoRaWAN concentrator 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.

]]> Comment on Adding a GPS Receiver to the iC880A LoRaWAN concentrator 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

]]> Comment on Adding a GPS Receiver to the iC880A LoRaWAN concentrator 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 […]

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