USE ARDUINO AS PC TEMP MONITOR SERIAL

The sketch will fail to upload if they are connected so you must first disconnect one or both serial pins on either the Uno or the ESP8266 and then upload the sketch. If you'd like to have a quick way to visibly see if things are running smoothly you can wire up a couple of LEDs.Ī final thing that tripped me up for a while is that the serial pins CANNOT both be connected between the ESP8266 and the Uno while uploading the sketch. There is code in place to use a red and green LED for debugging and status monitoring but those are not shown in the wiring diagrams. This includes the name and password for your WiFi network and the Key for your ThingSpeak channel. Those are places where you will need to paste in your own values to make this work. There are several places in code with values in '' brackets. Both of the chips I have ordered are set to 115200 baud but if you're trying to use this code and it doesn't seem to work try changing the baud to 9600 as your first step in debugging.

The version of the ESP8266 I bought comes in either 9600 baud or 115200 baud. The baud for the ESP8266 is set near the top of the. Their library comes with other features such as a heat index calculator which I don't show here but feel free to log that as well if you're interested in it!

USE ARDUINO AS PC TEMP MONITOR HOW TO

They have a description of how to install and use their library and a link to their GitHub repository. D7 | Signal (connect to Vcc via pull-up resistor)īefore you can use my code you will need to download and install the DHT library from Adafruit.

For ease of use all connections to 5 V or 3.3 V are red and all connections to ground are blue. The Fritzing diagram above shows the wiring. The signal pin will need to be connected to a pull-up resistor, which I used a 4.7 kohm resistor for. Both sensors work with voltages between 3.3 - 5 V. The DHT22 is a bit more accurate so if that's important to you opt for it instead. It's also only good for temperatures above freezing. In my case it is a ILI9486 / ILI9488L compatible 3.5' display. The DHT11 spec is only +/- 5% humidity and 2 degrees Celsius so it is not a super accurate sensor. Arduino Nano (or UNO if you want) TFT Display. Since the ESP8266 outputs 3.3 V and the Arduino boards can take that voltage there is no need to do anything to the serial line from the ESP8266 to the Arduino. I used a 220 Ohm resistor and a 470 Ohm resistor for mine which got me close enough to 3.3 V. Sparkfun has a great tutorial on this so you can see how they build theirs and calculate which value resistors you will need to use. If you don't want to buy a logic level shifter then you will need to make a voltage divider which you can do using two resistors. This also means that you will need to use a logic level shifter or make a voltage divider for the serial connection from the arduino board to the ESP8266 or you risk ruining it. The ESP8266 runs at 3.3 V so make sure you connect the Vcc pin to the 3.3 V pin on the Uno. The image above shows the front of the ESP8266 with the 8 broken out pins labeled. Then we will move on to wiring them to the Uno. First we should cover some basics of the ESP8266 and the DHT11.

Use arduino as pc temp monitor