Arduino is an essential magic weapon of Corporate DIY. With the Arduino development board, CNG can implement some common electronic devices to run functionality through simple code programs.
Today, Chuangxin's Workkeeper has brought you an Arduino thermometer. This thermometer can be used as a daily thermometer, and a home decoration can be made, especially a small innovation guest that is suitable for love. So, how is it realized?
Final work photo
First, material preparation
Arduino Uno X1
Arduino expansion board x1
LM35 temperature sensor X1
9G steering gear X1
A number of wires
A4 white card paper x1
materials needed
Second, the box production
Ready tools and jams
First, we have to use the rules and pencils to draw the plan of the box to be made according to the drawing of the box, draw it on the paper, the size of the box is based on the size of the next Arduino board, which is very test space imagination and box. structure.
Square paper box expands
After painting, we can cut it with scissors, as shown below:
Drawing drawing after cutting
Everyone can see a pointer to a small water drop in it, this is very simple, everyone cuts a color on the remaining card paper.
Next, according to the edge of the original painted edge, you can remember the one-faced view of the drawing line, which can ensure the cleanliness of the appearance. Here everyone remembers taking out your own colors! Give it a good-looking painting, and the scale can be designed yourself.
Box making completion
Third, Arduino circuit construction and assembly
After completing the previous box production, this step we have to complete the core part of the entire work, the sensor connection and the circuit are set up, and the connection diagram is as follows:
Circuit connection diagram
Circuit
After connecting the circuit, put the steering gear in the box, and open a small hole in front of the box before installation, and then secure the steer in the carton with hot melt glue, as shown in the figure:
Install a steering gear
How is the small water drip pointer installed on the servo? Here, you should use the steering wheel that you bring on the servir! Directly use double-sided adhesive to fix the pointer on the rudder disc, please see the figure below:
Multi-disk and pointer installation
Install the steering gear, rudder, pointer to carton
Here, all of the hardware is completed, and next is the write driver.
Fourth, the program is written
Arduino driver is written, we still use Arduino IDE to write this program, below is the driver of this beautiful Arduino thermometer, let us diy let this cold winter change. The principle of the code of this code is to collect the simulation value by the LM35 temperature sensor, convert the analog value to the temperature value by the transformation formula, because the dial is used by the steering machine, so it will be used here to use a mapping function MAP, turn the temperature The value mapped to the corresponding angular value, thereby controlling the pointer to the corresponding position. code show as below:
#include
#include
Servo myservo;
INT A, VAL; / / Defining variables
FLOAT TEMPERATURE; / / Define floating point variables for storing the conversion temperature
INT b = 3975; // Basic reference value of thermistor B
Float Resistance;
Void setup ()
{
MyServo.attach (4); / / Define the servo drive port
}
void loop ()
{
a = analogread (0); // read the simulation value of the temperature sensor
Resistance = (float) (1023-a) * 10000 / a; / / calculate the resistance value of the sensor
Temperature = 1 / (log (Resistance / 10000) /B +1/298.15) -273.15; // Convert resistance to temperature values
DELAY (500); // delayed 500 ms
VAL = MAP (Temperature, 0, 50, 0, 180); // // map the conversion temperature value to the angle value of the steering machine
MyServo.write (VAL); // Switch to the corresponding angle
}
WeChat public account search "Love Board Network" plus attention, daily update development board, intelligent hardware, open source hardware, activities, etc., you can make you full. Recommended attention!
[WeChat scanning picture can be directly paid]
Our other product:
