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Need some help

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I wanted to ask how much would a source code program with four buttons support cost.
Main screen displays volts, amps, ohm, frequency, time.
The program  start after the set resistance is detected by the set measuring voltage 15V.
Because the device works at high voltage after starting.
The device simply consists of an inverter connected to the 240V network that changes it to direct current,
and the microcontroller controls creating alternating current with the possibility of
setting each of the mentioned parameters at one time, divided into three sections.
For example: the total time is to be 30 seconds,
 and here it is possible to divide into three sequences: sequence 1, sequence 2, sequence 3.
Settings in sequence 1:
 duration
volt
amps
frequency
The same in sequence 2 and sequence 3.
Example:
 sequence 1:
3 seconds
180 volt
1.3Amp
500 Hz
- sequence 2:
7 seconds
180V
1Amp
250Hz
- sequence 3:
4 seconds
180V
0.8Amp
50Hz
While maintaining smooth transition from sequence 1 to 3 and the ability to enable and disable one of the sequences.
Let's say that this possibility is the first program.
Ultimately 10 programs also with the option of enabling or disabling one of the programs.
The current year, month, day and time can be set.
All parameters can be saved and I do not know what is better sd card or usb stick,
To read in the Excel format in the form of a table.
This is an introduction to my project. Because the program will be developed.

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