ESP32 SIM800L: Send Text Messages (SMS Alert) with Sensor Readings

Q&A Forum › Category: ESP32 › ESP32 SIM800L: Send Text Messages (SMS Alert) with Sensor Readings

José Neves asked 2 years ago

HI,
I´m trying to implement the project Send SMS “Hello from ESP32!” with T-Call ESP32 SIM800L am I’m not well succeed . Running the AtDebug available in library it gives me the follow message:
14:54:38.388 -> ***********************************************************
14:54:38.388 -> Module does not respond!
14:54:38.388 -> Check your Serial wiring
14:54:38.388 -> Check the module is correctly powered and turned on
14:54:38.388 -> ***********************************************************
Do you have any idea of what’s wrong ?

Grato,

Question Tags: Send SMS esp32

7 Answers

0 Vote Up Vote Down

Sara Santos Staff answered 2 years ago

Hi.
Are you sure you have a T-Call ESP32 Sim800L? If you have a slightly different module the pinout might be different and you may need to initialize the module using different pins.
Regards,
Sara

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José Neves answered 2 years ago

Hi,
Yes i’m sure ….. H317 TTGO T-Call v1.4.
JN

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José Neves answered 2 years ago

Hi Sara,
Acrescentei ao codigo :
int RegSta = modem.getRegistrationStatus();
SerialMon.println(RegSta);

E o resultado que obtenho é :
11:27:47.312 -> ets Jun 8 2016 00:22:57
11:27:47.312 ->
11:27:47.312 -> rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
11:27:47.312 -> configsip: 0, SPIWP:0xee
11:27:47.312 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
11:27:47.312 -> mode:DIO, clock div:1
11:27:47.312 -> load:0x3fff0018,len:4
11:27:47.312 -> load:0x3fff001c,len:1044
11:27:47.312 -> load:0x40078000,len:10124
11:27:47.312 -> load:0x40080400,len:5856
11:27:47.312 -> entry 0x400806a8
11:27:47.432 -> IP5306 KeepOn OK
11:27:50.432 -> Initializing modem…
11:27:51.431 -> -1
11:28:15.642 -> SMS failed to send
JN

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José Neves answered 2 years ago

Do i need to configure DTR and RI pin32/33?
JN

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Sara Santos Staff answered 2 years ago

Hi again.
I just used the code on the blog post. Everything worked as expected.
If you have the exact same board, no additional changes should be needed.
I don’t know what might be wrong.
Regards,
Sara

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José Neves answered 2 years ago

Hi,
I think im not using exactly the same board, you are using v1.3 and im using v1.4
jn

0 Vote Up Vote Down

Sara Santos Staff answered 2 years ago

Do you have the pinout for your board?
Check your board’s pinout and see if you need to change any of the pin assignments in the code.
Regards,
Sara