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Hi Patrick, you're uploading the sketch to the uno, not the Esp unit. The uno runs the code and only utilizes the wifi capabilities of the esp. So during code upload only the uno needs to be connected.
Yes it will with slight modifications. You will need to adjust the code to utilize the DHT22. Beyond that the rest will work the same.
Hi there, sorry for the delayed response. To answer your question, yes, you could use the motion sensor to trigger anything. The sensor itself is relatively simple and simply sends a TTL high signal when it detects motion. For a more complicated use like you're proposing you will probably need to use something like a raspberry pi or something along those lines.
Hi, you're absolutely correct. I used the arduino here not because it is necessary but as a learning tool for people getting started with the platform. It's basically a slightly more complicated Blinky program.
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These look like compiler issues and look like they're only warnings so the program should still run and compile. Are you able to compile the code and upload it to the board still? I did some googling on that specific warning and it looks like an issue using strings instead of const char*. I didn't see these issues when I was using this though.
I'm not sure what you mean by measure calipers. The only limitation this has is that it needs to have a large enough surface to get an echo off of. How accurate do you need the measurement to be? A I think this has 2 or 3 significant figures of accuracy at best and I wouldn't set much stock in anything beyond the tenths place for either inches or cm.
Hi ghpk, did you download and install the DHT library from Adafruit? It sounds like the library isn't being found. You can use any sensor you want for the temperature detection but you will need to either write the code to interface with it or find a library online. Good luck with this.
It looks like it's not getting the expected response from your wireless router. Make sure your password is entered correctly and that the BAUD rate is set correctly for your device. Some are 9600 and some are 115200.
The ESP8266 needs to be connected to the TX0 and RX0 pins. However, as you noticed, you cannot upload code to the Arduino while it is connected to those pins. To get around this what I did was I disconnected either the TX0 or RX0 pins while uploading the code. Then, after uploading was done, I hooked the TX0 and RX0 pins back up and restarted the Arduino.
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