Hi. Hope you are alright. I’m worried about putting the battery in the esp32’s GPIO to monitor the voltage level, as I don’t know if the current can burn it. My project uses two batteries (one for esp32 and sensors and one for motor and servo) connected to Vin of tp4056 and Vout connected to Vin of step up DC DC. Can you help me? I would like to monitor the battery voltage level.
Can you show me your circuit? To share an image, send a link to Imgur or google drive, for example.
Are you using a step-up DC-DC to step up the voltage to 5V? Did you consider using a low dropout voltage regulator circuit instead?
Hi Sara! Thank you for your attention
Yes, I thought about using LDO, but I couldn’t find the regulator to sell in Brazil
I am very pleased with the ebook tutorial. I tested the voltage divider on the GPIO port and it worked perfectly for both voltage and current reduction. Now I am sure to continue with the project.
I take this opportunity to consult you about the possibility of you making a web server tutorial in HTML that updates the page with continuous readings in the form of a table or graph, like dashboard. I would also like a tutorial to make multiclient communication, with two lora communicating with gateway and this one with a web server. if there is no interest, I would like some reference.
I’m glad it is working as expected (I saw the photo you sent via email).
As for the other questions, to make a web server that updates the page with continuous readings, you can use server sent events.
In our “Build Web Servers with ESP32 and ESP8266” eBook, we explain in great detail how to do that using tables and charts.
We have a free tutorial that explains how to use server-sent events:
We also have these tutorials about creating charts:
For multiclient communication with LoRa, I think you need to use LoraWAN to set up a gateway that receives messages from differentes nodes (Lora senders) and sends those messages to other nodes (ESP32). Unfortunately, we don’t have any LoRaWAN projects. Search for “ESP32 LoraWAN” or “ESP32 TTN Lora”. I think that might help.