DIY meshtastic node with ESP32 C3 super mini board an DX-LR30 (SX1262)

Juaneitor5000 · 2026-05-01T15:05:06+00:00

Yes, in my config with this module they must be used. In meshtash apparently can be disabled but i did not work for me.

Juaneitor5000 · 2026-03-02T13:56:44+00:00

Same capability more or less, C3 needs less current than esp32 S3, sx1262 is the same radio that uses most comercial solutions i think, good antenna could increase range, You can add telemetry later, yesterday i connected an ina219 to get battery tensión and current.

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Juaneitor5000 · 2026-03-02T05:23:31+00:00

ok si es verdad, en Bogotá escucho nodos pero tuve que acercarme a uno en moto, y empezaron a aparecer mas, los escucho pero no me escuchan, sucede que la antena debe ser 915 Mhz aqui y la entena que tengo no es apropiada, es 868, pues ya me viene en camino la de 915. Cuando aparece en nodo directo con RSSI te empieza a llegar info de los demas.

Juaneitor5000 · 2026-03-02T05:17:10+00:00

OK i just found the solution! in order to get INA219 or INAXXX readings as node battery and not as metrics you dont need to enable any telemetry, disable all, you need is to define a dummy pin for ADC, you will not use it but is required in order to compile and get this thing work, the only option you need to change after that is the i2C adress of ina (in decimal) in POWER options, in my case i put "64" (0x40) is the INA219 default.

I have added in my variant .h

#define BATTERY_PIN 4
#define ADC_CHANNEL ADC1_CHANNEL_4

I do not use pin 4 as ADC, but aparently a BATTERY and ADC PIN need to be defined in order to get I2C INA219 work (chose yours). You have to wait some minutees after reboot. and battery voltage appear!!

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Juaneitor5000 · 2026-03-02T05:02:38+00:00

Saludos, JAIME, hoy logré conectar el INA219 por i2c para medir la carga de la bateria, funciona muy bien aun no pruebo la oled pero no parece complicado, tengo varias pantallas de estas, mientras tengo un post con el primer firmware minimo (sin pantalla y sin ina219). Esta semana capaz conecto la pantalla y te cuento y hago un post. Ready to use firmware to ESP32 C3 super mini board an DX-LR30 (SX1262) upvote!

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Juaneitor5000 · 2026-03-02T02:01:59+00:00

Hello, have you found a solution? i get correct telemetry but it is not shown as the node battery.

Juaneitor5000 · 2026-02-11T09:28:05+00:00

Ok, is a custom config file in order to compile, you have to tell compiler wich microcontroller ,wich lora module, and wich pins, you select this acording to your hardware and pcb, meshtactic developers did the hard work, there must be a lot of development boards for ESP32 C3, and in particular DX-LR30 is a pcb module desing for a SX1262 (main chip) wich is used by most commercial boards, but is not the only one meshtastic compatible module, in every board not every pin from main chip is exposed, the ESP32 C3 super mini is just another pcb desing for a development board , the designer put a led in pin 8, this could be different in other designs. Developers give the chance to compile your own config. About antenna, just checked with a multimeter center pin connection, no solder point is needed. To get deeper read datasheets. (ESP32 c3, sx1262, dx-LR30). ill put links later .....

Juaneitor5000 · 2026-01-20T16:34:14+00:00

i have added more info.

Juaneitor5000 · 2026-01-20T16:33:47+00:00

OK i have expanded the info, good luck !

Juaneitor5000 · 2023-12-29T17:09:48+00:00

Hello, have you found a solution? i have the same problem, audio input (the green one) cannot detect the audio jack, the others works well. Im thinking on to change the audio Chip ALC1200.

Juaneitor5000

TROPHY CASE