Calibrating a temperature sensor using an Arduino code

Calibrating a temperature sensor using an Arduino code involves the following steps:

1. Connect your temperature sensor to your Arduino board.

2. Write the Arduino code to read the temperature from the sensor. You can use the built-in libraries in Arduino IDE to read the temperature from various sensors, such as the DS18B20, LM35, or DHT11 sensors.

3. Once you have the temperature reading, you can compare it to a known temperature reading to calibrate your sensor. For example, you can place your temperature sensor in a container of ice water and measure the temperature. The temperature of ice water should be around 0 degrees Celsius or 32 degrees Fahrenheit. If your sensor is not reading the correct temperature, you can adjust the code to compensate for the difference.

4. Another way to calibrate your sensor is to place it in boiling water and measure the temperature. The temperature of boiling water should be around 100 degrees Celsius or 212 degrees Fahrenheit. Again, if your sensor is not reading the correct temperature, you can adjust the code to compensate for the difference.

5. Once you have calibrated your temperature sensor, you can use it to measure the temperature in other environments. Make sure to take into account any calibration adjustments you made to the code when using the sensor in other settings.

One Point Calibration

One point calibration is the simplest type of calibration. If the sensor output is already scaled to useful measurement units, a one point calibration can be used to correct for sensor offset errors in the following cases:

• Only one measurement point is needed. If you have an application that only requires accurate measurement of a single level, there is no need to worry about the rest of the measurement range.  An example might be a temperature control system that needs to maintain the same temperature continuously.
• The sensor is known to be linear and have the correct slope over the desired measurement range. In this case, it is only necessary to calibrate one point in the measurement range and adjust the offset if necessary.  Many temperature sensors are good candidates for one-point calibration.

A one point calibration can also be used as a "drift check" to detect changes in response and/or deterioration in sensor performance.  

For example, thermocouples used at very high temperatures exhibit an 'aging' effect.  This can be detected by performing periodic one point calibrations, and comparing the resulting offset with the previous calibration.

How to do it:

To perform a one point calibration:

1. Take a measurement with your sensor.
2. Compare that measurement with your reference standard.
3. Subtract the sensor reading from the reference reading to get the offet.
4. In your code, add the offset to every sensor reading to obtain the calibrated value

cal_factor is my offset value of Arduino code,  

 

Rebuild broken Remote Control Toy Car and upgrate with a Camera using ESP32-CAM - Ai-Thinker

 

Parts Required

1. ESP32-CAM with OV2640   (  ESP32-CAM - Ai-Thinker )
   

2. FTDI programmer

3. Old RC car to make a chassis of car
   

4. L298N Motor Driver Unit  

Introducing the ESP32-CAM

The ESP32-CAM is a very small camera module with the ESP32-S chip that costs approximately $10. Besides the OV2640 camera, and several GPIOs to connect peripherals, it also features a microSD card slot that can be useful to store images taken with the camera or to store files to serve to clients.

 

 

The ESP32-CAM doesn’t come with a USB connector, so you need an FTDI programmer to upload code through the U0R and U0T pins (serial pins).

 

ESP32-CAM Pinout

 

    

Video Streaming Server for testing your first code

first, let's test our video streaming server, then go to project back, 

1. Install the ESP32 add-on 

• Open the Arduino IDE (Integrated Development Environment).

• Go to "File" and select "Preferences."

• In the "Additional Boards Manager URLs" field, add the following URL: https://dl.espressif.com/dl/package_esp32_index.json

• Click "OK" to save the changes.

• Go to "Tools" and select "Board: " and then "Boards Manager."

• In the "Boards Manager" window, search for "esp32" and select "esp32 by Espressif Systems" from the results.

• Click the "Install" button to install the ESP32 add-on.

• Once the installation is complete, close the "Boards Manager" window.

• Go to "Tools" and select "Board: " and then "ESP32 Dev Module" from the list of boards.

• You're now ready to use the ESP32 with Arduino!

2. Camera Web Server from Example Code 

 

 

Don't froget to update your WIFI Username and Password, and select proper cam module.

3. ESP32-CAM Upload Code using FTDI programmer

Upload Code with Arduino IDE

To upload code to the ESP32-CAM (AI-Thinker) using Arduino IDE, follow the next exact steps.

Connect the ESP32-CAM board to your computer using an FTDI programmer. Follow the next schematic diagram:

 

 

Many FTDI programmers have a jumper that allows you to select 3.3V or 5V. Make sure the jumper is in the right place to select 5V.

 

 

Important: GPIO 0 needs to be connected to GND so that you’re able to upload code.

 

ESP32-CAM	FTDI Programmer
GND	GND
5V	VCC (5V)
U0R	TX
U0T	RX
GPIO 0	GND

 

To upload code to the ESP32-CAM using Arduino IDE,

1) Go to Tools > Board and select AI-Thinker ESP32-CAM. You must have the ESP32 add-on installed. Otherwise, this board won’t show up on the Boards menu.

2) Go to Tools > Port and select the COM port the ESP32-CAM is connected to.

3) For demonstration purposes, you can upload a blank sketch to your board:

void setup() {
  // put your setup code here, to run once:
}

void loop() {
  // put your main code here, to run repeatedly:
}

4) Then, click the Upload button in your Arduino IDE.

5) When you start to see some dots on the debugging window, press the ESP32-CAM on-board RST button.

After a few seconds, the code should be successfully uploaded to your board.

6) When you see the “Done uploading” message, you need to remove GPIO 0 from GND and press the RST button to run your new code.

 

But Now you must upload final code before removing programmer.

 7) Now you can upload final code to control RC car.

download the code form GitHub and upload as same as above

https://github.com/almorawaka/ESP32-CAM-RC-car-with-camera.git

Go to my git hub and download code and update SSID and PW in the code. Select proper Module and Upload the code

8) Solder the circuit connections as follows 

 

Start by connecting the ESP32-CAM to the motor driver as shown in the schematic diagram. You can either use a mini breadboard or a stripboard to place your ESP32-CAM and build the circuit.

The following table shows the connections between the ESP32-CAM and the L298N Motor Driver.

 

Finally, apply power with a power bank as shown in the schematic diagram. You need to strip a USB cable. In this example, the ESP32-CAM and the motors are being powered using the same power source and it works well.

4. Getting the IP address of your server

When you upload this code to your ESP32-CAM module and open the Serial Monitor in the Arduino IDE, you should see the module connecting to your Wi-Fi network and obtaining an IP address. The IP address will be printed in the Serial Monitor.

Open a browser on the ESP32-CAM IP address, and you should be able to control your robot. The web server works well on a laptop computer or smartphone.

5. Accessing the Video Streaming Server

Check your WiFi router and get the IP of ESP-32 CAM module and log into that IP

 

Wrapping Up

Thanks for https://randomnerdtutorials.com/esp32-cam-car-robot-web-server/  for open source code sharing.... :)