I’m trying make a open source system to operate a mass-flow-controller (MFC) over the web. The MFC is operated with a linear current 4-20mA, with 4mA-ValveClosed and 20mA-ValveOpen. I’m using an arduino uno r4 wifi board and an Gravity IC2 4-20mA DAC breakoutboard purchased from dfrobot (https://www.dfrobot.com/product-2625.html). I want my arduino to standby on an dedicated IP address and listen for incoming clients and accordingly control the MFC. For example, when a client sents 10.0.0.35/15, the arduino sets the Gravity I2C DAC to a setpont of 15mA which eventually cotrolles the MFC. I’ve written the code bellow, but the problem is that the arduino-DAC doesn’t hold the setpoint and keeps reseting when the connection is closed!

This is my first post: I use Wemos D1 R32 boards, ESP3 wroom. One is the transmitter and mounted in a remote location. It transmits to a receiver second esp32 that parses the data uses some and output info to a screen and the COM port.

I have Arduino IDE 2.3.2 installed, installed FabGL 1.0. using the Library Manager and installed esp32 3.0.2 by espressif as instructed by many videos on internet (preferences->Additional boards manager…).

I have Arduino IDE 2.3.2 installed, installed FabGL 1.0. using the Library Manager and installed esp32 3.0.2 by espressif as instructed by many videos on internet (preferences->Additional boards manager…).

i want to connect ESP-CAM with my pc and doesn’t work

I am starting to write a library that needs to incorporate the painlessmesh library as its core function, essentially, a wrapper around it. I started putting it together but quickly hit a snag wrapping the painlessmesh lib. I know I am missing something in the declaration, just cant figure out what.
Any help would be great moving this on.

Is there any way of calibrating a HX711 module without phisically wire the load cell and use known weight?
I have a load cell of 2t (2000kg), and on it’s datasheet is stated that is 2mV/V. I also know that the load cell will be supplied with 5V using HX711.
Can I simulate this somehow, maybe an electronic circuit, and be able to calibrate the HX711, without wiring the cell and load it with some known weight?

I have a piezoelectric sensor disk. I’m looking to take a output from this by using ESP32 microcontroller. But when I connect the sensor with microcontroller at GPIO 34, it gives only the positive peaks. But I need negative peaks also (i.e., I need to take a waveform as like in a oscilloscope).
Connections made like:
Sensor +ve – GPIO34
Sensor -ve – Ground

I wanted to upload code to my arduino wt32 eth01 but there is an error. I don’t know why it’s showing. Is there more bugs in the code or the rest is fine ? I don’t know if there has to be void main and loop function. The problem is this error nothin else so far. I don’t know what else I should add to this question.

This is my code. I want to save the data get by sensors to the firebase database. I dont know what function causes the error coz the errors only says Ping Timeout
This is my code. I want to save the data get by sensors to the firebase database. I dont know what function causes the error coz the errors only says Ping Timeout