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

By: Sara Santos

Sara Santos — Sat, 12 Apr 2025 10:35:24 +0000

In reply to teja.

Hi.
You need to have two different SIM cards.
One for the module and another for the phone.
Regards,
Sara

By: teja

teja — Sat, 12 Apr 2025 07:36:42 +0000

hello , i have a doubt ,where we have one sim card usage. I have inserted in the ttgo-t esp32 sim800l but in phone there is no sim card. how do i get sms to phone and where we sms in phone. code say sms as sent but where and how ? as phone doesnot have sim card in it , it shows insert sim card to continue sms and calls . what should i do ?

By: Sara Santos

Sara Santos — Tue, 18 Jul 2023 11:58:16 +0000

In reply to Denis.

Hi.
Yes. You can create a web server to input the phone number and that number in the code.
You can learn more about input on a web server with this tutorial: https://randomnerdtutorials.com/esp32-esp8266-input-data-html-form/
Then, you need to combine both codes.
Regards,
Sara

By: Denis

Denis — Mon, 17 Jul 2023 21:42:01 +0000

Hi, realy no need to say this web site is extraordinary one – everyone knows it. But in this project would be nice to be able to input phone number without coding. Somehow after first turn on or etc. Would it be possible? Thanx in advance.

By: El haj

El haj — Mon, 12 Jun 2023 07:54:17 +0000

In reply to Sara Santos. Hello, please can you give me the simplest sketch to control relays with esp32 lyligo Sim800L. Thank very much.

By: Sara Santos

Sara Santos — Sun, 26 Mar 2023 22:45:38 +0000

In reply to Carsten Barth.

Thanks for sharing that tip.
Regards,
Sara

By: Carsten Barth

Carsten Barth — Sun, 26 Mar 2023 14:41:26 +0000

Hello,

maybe as a hint to all who have problems to get the SMS out:
I added a delay of 20sec after PIN initialisiation and the sendSMS comand since it takes a while until the GSM network connection is established and the SMS service is available. At least that helped for me to avoid “SMS failed to send”…

Carsten

By: Sara Santos

Sara Santos — Mon, 20 Feb 2023 09:46:31 +0000

In reply to Gilbert Hersschens.

We have some tutorials with the SIM7000G:
– https://randomnerdtutorials.com/lilygo-t-sim7000g-esp32-lte-gprs-gps/
– https://randomnerdtutorials.com/lilygo-t-sim7000g-esp32-gps-data/
Regards,
Sara

By: Gilbert Hersschens

Gilbert Hersschens — Sun, 19 Feb 2023 10:16:03 +0000

Interesting future extension to my home automation system.
But… 3G will be phased out by most major Telecom operators in Belgium (and probably in other EU coutries as well) by the end of 2024. And the plug will be pulled on 2G by 2027. So it’s a safer bet to use a board which uses 4G, like the SIM7000G – unless you want to mess a bit with ESP and SMS before you go for a future-proof project.
Unfortunately boards with a SIM7000G are a lot more expensive (+/- 40€ vs. 11 $ for the SIM800L). Moreover custom charges may apply for goods with a value over 22€ imported from outside the EU.

By: Sara Santos

Sara Santos — Tue, 13 Dec 2022 20:22:38 +0000

In reply to Philippe de Blois.

Hi.
Take a look at this one: https://randomnerdtutorials.com/lilygo-t-sim7000g-esp32-lte-gprs-gps/
I hope this helps.
Regards,
Sara