| Electronics > Projects, Designs, and Technical Stuff |
| Thermometer issue |
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| fedimakni:
Hello, I have this PCB I removed it from a thermometer. As you can see i don't have access to the microcontroller and i would like to let it become wireless by adding an esp32 to it. the sensor is soldered in the left side ( two pin labeled SEN) I think that the only solution to intercept the data is by connecting the lcd pin ( in the buttom side) to the esp32 but i didn't get how to do it or how the data will be ( as you can see there's no reference for the LCD. I didn't get the role of the piezo here too. Thank you. PS: no schematic or pcb layout is available on internet - I would like to stay with this solution and not doing things from scratch. |
| ogden:
--- Quote from: fedimakni on May 31, 2019, 05:15:59 am ---I think that the only solution to intercept the data is by connecting the lcd pin ( in the buttom side) to the esp32 but i didn't get how to do it or how the data will be ( as you can see there's no reference for the LCD. --- End quote --- Yes you are right that only way to get data from such highly integrated thing is to read it's LCD display signals. You have to answer yourself what you want more - read data from that LCD thermometer by all means or build wireless thermometer using esp32? In case you need just WiFi thermometer, then leave this LCD thing alone and get i2c or 1-wire temperature sensor for your esp32. One of first internet search hits from "esp32 thermometer" keywords: https://www.instructables.com/id/ESP32-E-Paper-Thermometer/ --- Quote ---I didn't get the role of the piezo here too. --- End quote --- It's beeper/speaker. |
| fedimakni:
Thank you for your reply Actually I want to intercept the data from the LCD to the esp32 and then send that data vi wifi. the problem is how to connect that LCD to the esp and what kind of data will it display? ( by checking with multimeter 14 pin with no VCC or GND pin. ) |
| ogden:
First you have to learn how LCD works. Then most likely you will understand what it takes to 1) decode LCD drive signals 2) intercept them. Start here: https://youtu.be/ZP0KxZl5N2o?t=1 Further reading Hint: to watch & decode LCD drive signals you need oscilloscope. To illustrate how nontrivial LCD display is, here are drive waveform samples (attach) that shall be sampled and then decoded. I am not even sure that esp32 is up-to the task BTW. |
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