Big ESP32 + SX127x topic part 3

I have LMIC which runs entirely inside the S76G-based T-Watch daughterboard (on it’s STM32L073 MCU) as a part of my SoftRF port on STM32 platform.
But this topic is out of scopes for this ESP32 thread.

t-watch-extant-3

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Great! Can you share your LMIC port? In your github repo i found binaries only.

The LMIC is integrated into SoftRF as one library of many.
Direct link onto the library is below:

SoftRF/S76G is to be built with Arduino Core STM32 for Nucleo L073RZ target.

Build instructions

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This means your whole application, including LMIC, is running on the daughterboard of T-Watch, i guess?

I’m looking for a solution which emulates a native SX1276 on the S76g, thus the S76g is controllable like a RFM95 module.

I’m having problems with my recendly purcharsed board - its exact name is:
SX1276 V2 Lora ESP32 LX6 Dual-Core 0,96" OLED Bluetooth LE Wifi Kit 32 Modul CP2012 IOT 868-915MHz

EDIT: from Heltec
I’ve tried ttn-abp.ino for activating with differend pin settings and i’m never receiving anything in the Data Console … :frowning:
I’ve set up anything properly in my Account with ABP as activation method.

I think for V2 this should be correct:

const lmic_pinmap lmic_pins = {
.nss = 18,
.rxtx = LMIC_UNUSED_PIN,
.rst = 14,
.dio = {/dio0/ 26, /dio1/ 35, /dio2/ 34 }
};

Could it be that I’m already having V2.1 and it requires different settings? (It has only printed “V2” on it)

In my Serial Monitor I’m having something like this:

14:14:02.410 -> Starting
14:14:02.410 -> RXMODE_RSSI
14:14:02.410 -> 9585: engineUpdate, opmode=0x808
14:14:02.410 -> 9618: EV_TXSTART
14:14:02.444 -> 9686: TXMODE, freq=903900000, len=26, SF=7, BW=125, CR=4/5, IH=0
14:14:02.444 -> Packet queued
14:14:03.458 -> 75200: setupRx1 txrxFlags 00 --> 01
14:14:03.492 -> start single rx: now-rxtime: 4
14:14:03.492 -> 75331: RXMODE_SINGLE, freq=923300000, SF=7, BW=500, CR=4/5, IH=0
14:14:03.492 -> rxtimeout: entry: 76664 rxtime: 75325 entry-rxtime: 1339 now-entry: 4 rxtime-txend: 61775
14:14:04.492 -> 138172: setupRx2 txrxFlags 0x1 --> 02
14:14:04.492 -> start single rx: now-rxtime: 4
14:14:04.492 -> 138303: RXMODE_SINGLE, freq=923300000, SF=9, BW=125, CR=4/5, IH=0
14:14:04.526 -> rxtimeout: entry: 140624 rxtime: 138297 entry-rxtime: 2327 now-entry: 4 rxtime-txend: 124747
14:14:04.526 -> 140640: processRx2DnData txrxFlags 0x2 --> 00
14:14:04.526 -> 140700: processDnData_norx txrxFlags 00 --> 20
14:14:04.526 -> 140960: EV_TXCOMPLETE (includes waiting for RX windows)
14:14:04.526 -> 141269: engineUpdate, opmode=0x900

Any ideas what’s wrong?
Thanks

This looks more like some AliExpress product title than the actual make and model of a board.
Start with getting the exact make (manufacturer), model and version of your board first (read the start of this topic for an impression of a subset of available boards).
The board make, model and version are essential for determining:

  • What pin mappings to use
  • If manual wiring of DIO ports is required
  • If additional code is required to get the board running (e.g. like required for TTGO T-Beam V1.0)

Also take care that the TTN LoRaWAN keys/id’s in the sketch are entered correctly and in the correct byte order. See: Format of Keys and ID's for Arduino LMIC library [HowTo]

Please read the following for how to format code and logs in your posts:
How do I format my forum post? [HowTo]

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Hi,

I have a heltec v1 board, they are not providing the license code so i cannot use the heltec files.
i loaded ttgo file in the heltec that worked well, i see the hello world in hex code in the ttn gateway manager.

the problem i have now is that the rssi is not showing on the display.
i use this code: https://github.com/PiAir/esp32-sx1276/blob/master/TTN_test_ESP32_ABP.ino

any toughts ?

RSSI (received signal strenth indication) is available only for downlink messages.
This could be the reason why you don’t see RSSI on the display.

can i not use the ack for that ?

ACK is received via a downlink message so RSSI should be available when receiving ACK.
The basic Arduino-LMIC examples and your linked code (which is based on ttn-abp.ino) however only print RSSI when data is received in a downlink message (ACK is not data).

To print RSSI when ACK is received but no data is received you will have to modify the code for EV_TXCOMPLETE.

Hi,
i’m having this board: TTGO ESP32-Paxcounter LoRa32 V2.1 1.6 Version 868MHZ
but can’t get it to work (the TTN console won’t receive anything) … here’s my settings:

  • I’m using the MCCI LoRaWAN LMIC Library -> trying to activate via ttn-abp script (yes I think i’ve set up anything properly in my TTN account)
  • modified lmic_project_config.h -> setting the frequency: #define CFG_eu868 1 (also in config.h)
  • in config.h i set the debug level: #define LMIC_DEBUG_LEVEL 2
  • in Arduino IDE: as board I used TTGO LoRa32-OLED V1 (is there a V2.1?)

my ttn-abp script uses the following settings:
NWKSKEY, PROGMEM APPSKEY, DEVADDR <- i’ve pasted it directly from TTN - or do i need to use reverse order? (read it somewhere)

my pin mapping:

const lmic_pinmap lmic_pins = {
    .nss = 18,                       // chip select on feather (rf95module) CS
    .rxtx = LMIC_UNUSED_PIN,
    .rst = 19,                       // reset pin
    .dio = {26, 33, 32}, // assumes external jumpers [feather_lora_jumper]
                                    // DIO1 is on JP1-1: is io1 - we connect to GPO6
                                    // DIO1 is on JP5-3: is D2 - we connect to GPO5
};

^^ there’s a sketch on the Amazon page where i bought it which shows different pins(?)
but I’m not sure how to use them / if they’re correct …

here’s my serial monitor output:

⸮⸮⸮⸮8896
load:0x40080400,len:5816
entry 0x400806ac
Starting
RXMODE_RSSI
9650: engineUpdate, opmode=0x808
9694: EV_TXSTART
9765: TXMODE, freq=867500000, len=26, SF=7, BW=125, CR=4/5, IH=0
Packet queued
75368: setupRx1 txrxFlags 00 --> 01
start single rx: now-rxtime: 3
75500: RXMODE_SINGLE, freq=867500000, SF=7, BW=125, CR=4/5, IH=0
rxtimeout: entry: 77052 rxtime: 75493 entry-rxtime: 1559 now-entry: 4 rxtime-txend: 61863
138252: setupRx2 txrxFlags 0x1 --> 02
start single rx: now-rxtime: 4
138384: RXMODE_SINGLE, freq=869525000, SF=9, BW=125, CR=4/5, IH=0
rxtimeout: entry: 140704 rxtime: 138377 entry-rxtime: 2327 now-entry: 4 rxtime-txend: 124747
140723: processRx2DnData txrxFlags 0x2 --> 00
140768: processDnData_norx txrxFlags 00 --> 20
141023: EV_TXCOMPLETE (includes waiting for RX windows)
141331: engineUpdate, opmode=0x900
3891331: engineUpdate, opmode=0x908
3891355: EV_TXSTART
3891421: TXMODE, freq=867700000, len=26, SF=7, BW=125, CR=4/5, IH=0
Packet queued
3957023: setupRx1 txrxFlags 0x20 --> 01
start single rx: now-rxtime: 3
3957154: RXMODE_SINGLE, freq=867700000, SF=7, BW=125, CR=4/5, IH=0
rxtimeout: entry: 3958707 rxtime: 3957148 entry-rxtime: 1559 now-entry: 4 rxtime-txend: 61863
4019907: setupRx2 txrxFlags 0x1 --> 02
start single rx: now-rxtime: 3
4020038: RXMODE_SINGLE, freq=869525000, SF=9, BW=125, CR=4/5, IH=0
rxtimeout: entry: 4022359 rxtime: 4020032 entry-rxtime: 2327 now-entry: 3 rxtime-txend: 124747
4022378: processRx2DnData txrxFlags 0x2 --> 00
4022438: processDnData_norx txrxFlags 00 --> 20
4022698: EV_TXCOMPLETE (includes waiting for RX windows)
4023013: engineUpdate, opmode=0x900

Any ideas what’s wrong? Thanks

If you see this log, the LMIC stack is sending data, so your pin mapping will be correct and the LoRa radio is working.

You probably did not join the network yet, so check your ABP procedure, esp. the setup for the network.

Any pointers how to modify this code ?
what should i add ?

this original:
case EV_TXCOMPLETE:
Serial.println(F(“EV_TXCOMPLETE (includes waiting for RX windows)”));
u8x8.drawString(0, 5, “EV_TXCOMPLETE”);
digitalWrite(BUILTIN_LED, LOW);
if (LMIC.txrxFlags & TXRX_ACK)
Serial.println(F(“Received ack”));
u8x8.drawString(0, 5, "Received ACK ");
if (LMIC.dataLen) {
Serial.println(F(“Received “));
u8x8.drawString(0, 6, “RX “);
Serial.println(LMIC.dataLen);
u8x8.setCursor(4, 6);
u8x8.printf(”%i bytes”, LMIC.dataLen);
Serial.println(F(” bytes of payload”));
u8x8.setCursor(0, 1);
u8x8.printf(“RSSI %d SNR %.1d”, LMIC.rssi, LMIC.snr);

i changed it into :
case EV_TXCOMPLETE:
u8x8.setCursor(0, 1);
u8x8.printf(“RSSI %d SNR %.1d”, LMIC.rssi, LMIC.snr);
Serial.println(F(“EV_TXCOMPLETE (includes waiting for RX windows)”));
u8x8.drawString(0, 5, “EV_TXCOMPLETE”);
digitalWrite(BUILTIN_LED, LOW);
if (LMIC.txrxFlags & TXRX_ACK)

that did not work :frowning:

My TTGO paxcounter V2.1 finally works - i can confirm these settings (Arduino IDE):
Flashed with board setting “TTGO LoRa 32-OLED V1” (there was no other TTGO Board preset)

const lmic_pinmap lmic_pins = {
    .nss = 18,                       // chip select on feather (rf95module) CS
    .rxtx = LMIC_UNUSED_PIN,
    .rst = 19,                       // reset pin
    .dio = {26, 33, 32}, // assumes external jumpers [feather_lora_jumper]
                                    // DIO1 is on JP1-1: is io1 - we connect to GPO6
                                    // DIO1 is on JP5-3: is D2 - we connect to GPO5
};

I’m now having problems with power supply, when connecting a powerbank (USB) it works like a charm,
but when connecting a Battery to the battery connector there are massive dropouts - see the counter, it should send each 10 seconds:

image

I’m using this battery (which was recommended for the TTGO board) and it should be fully charged:

Is that battery too weak? Any other recommendations?

PS: no success at all with my Heltec V2 - I assume it’s either not the board as expected or it’s damaged … :confused:

To prevent further confusion, that is not the real name of your board.
The correct name of the board is TTGO LoRa32 V2.1-1.6 like shown below.

6

LilyGO is not very consistent in their naming of this board series.
The board’s model name is actually TTGO LoRa32, also referred to as ‘T3’ which is confusing.
V2.1 is the version of the model, while 1.6 is the revision number of this model version. Again confusing due to the double ‘version’ number. ‘TTGO LoRa32 V2.1 rev1.16’ would have been easier to understand.

ESP32-PaxCounter is the name of software that came probably installed on it.
There is a dedicated topic for PaxCounter: Wifi/BLE Paxcounter Project with ESP32 boards

thanks for your info - btw. do you know if there’s also an Arduino (IDE) version of paxcounter?

No there is not. To my understanding PlatformIO is used because the Arduino IDE is much more limited, lacks important features and is much less productive.

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Please properly format code and logs in your posts, see: How do I format my forum post? [HowTo]

To print RSSI and SNR for acknowledgements (ACK) independent from if data was received or not, do the following:

In the original code, from the if (LMIC.dataLen) { ... } code block remove:

u8x8.setCursor(0, 1);
u8x8.printf(“RSSI %d SNR %.1d”, LMIC.rssi, LMIC.snr);

And place it in a separate if statement after (not within) that code block as follows:

if (LMIC.dataLen) {
...
}
if ((LMIC.txrxFlags & TXRX_ACK) || LMIC.dataLen) {
    u8x8.setCursor(0, 1);
    u8x8.printf(“RSSI %d SNR %.1d”, LMIC.rssi, LMIC.snr);
}

TTGO LoRa32 V2.1 rev1.6 versus TTGO LoRa32 V2.0 pin layouts

A while ago I made a comparison between the pin layouts of TTGO LoRa32 V2.1 rev1.6 and TTGO LoRa32 V2.0. There are important differences and a comparison was not available from LilyGO.
The layouts are included below in png and pdf formats.
Blue labeled pins are GPIO ports for the JTAG interface. Green labeled pins are GPIO ports used for the SD Card. Red labeled pins are LoRa DIO ports that are not connected to GPIO ports (and require explicit wiring to a GPIO pin when needed).

1

PDF: TTGO LoRa32 V2.1 rev1.6 versus V2.0 pin layout comparison rev1.1.pdf (2.2 MB)

UPDATE:
Different from what the above comparison says DIO1 and DIO2 on the TTGO LoRa32 V2.1.6 (V2.1 rev 1.6) seem to be already wired on the PCB.

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Hi i have it now this way
indent preformatted text by 4 spaces

case EV_TXCOMPLETE:
            Serial.println(F("EV_TXCOMPLETE (includes waiting for RX windows)"));
            u8x8.drawString(0, 5, "EV_TXCOMPLETE");
            Serial.println(LMIC.rssi);
            digitalWrite(BUILTIN_LED, LOW);
            if (LMIC.txrxFlags & TXRX_ACK)
              Serial.println(F("Received ack"));
              u8x8.drawString(0, 5, "Received TACK  ");
            if (LMIC.dataLen) {
              Serial.println(F("Received "));
              u8x8.drawString(0, 6, "RX ");
              Serial.println(LMIC.dataLen);
              u8x8.setCursor(4, 6);
              u8x8.printf("%i bytes", LMIC.dataLen);
              Serial.println(F(" bytes of payload"));
                            }
            if ((LMIC.txrxFlags & TXRX_ACK) || LMIC.dataLen) {
              u8x8.setCursor(0, 1);
              u8x8.printf("RSSI %d SNR %.1d", LMIC.rssi, LMIC.snr);
                           }  

that doesnt work
ill think the if is not fullfilled, if i remove the LMIC.txrxFlags &
there is a line on the display rssi o snr o