[Saatwik]

This article may help you https://www.engineersgarage.com/articles/spi-what-serial-peripheral-interface-protocol

please ask is any doubt ……

[Saatwik]

SPI is short distance communication technology if you want more detail please visit here https://www.engineersgarage.com/articles/spi-what-serial-peripheral-interface-protocol

[Saatwik]

It is called RFID that is a card which can recognized by it's RFID detector ,each card has specific code and the time can be determine by RTC that give you real time of your clock.

[Saatwik]

please visit the link, here you will get how to take analog input https://www.engineersgarage.com/embedded/arduino/how-use-analog-input-and-analog-output-arduino-board

Now, you can get analog input from load cell after this jus put 1KG load to calibreate it for example if you getting 376 analog value at 1KG just divide the analog value with 376 to get exact value of load.

[Saatwik]

Please visit link , there is project that mesure or count frequency https://www.engineersgarage.com/contribution/frequency-and-rpm-counter

[Saatwik]

yes, you can get signal inside of house 

[Saatwik]

you can get help from this peoject https://www.engineersgarage.com/contribution/dot-matrix-display-using-arduino

[Saatwik]

Any IC that generate PWM upto 12v may be work for fast switching .

[Saatwik]

Dear Ole,

Please, Ask Question clearly and as i understand if you want to high voltage output at the logic high of MCU then you can connect Relay that opearate as a switch and Make Switch close to connected with power supply .

[Saatwik]

you can get help from this project https://www.engineersgarage.com/contribution/gps-and-gsm-based-vehicle-tracking-system

[Saatwik]

you can buy online or if you want to make it DIY then take a exhaust fan and mount it on stand above your soldering desk

[Saatwik]

you can buy online or if you want to make it DIY then take a exhaust fan and mount it on stand above your soldering desk

[Saatwik]

 Serial.begin(19200);

 SIM900.begin(19200);

 

Conform your baud rate for GSM . i think it should be 9600 . if it is 19200 then change it in seral moniter from below button.

[Saatwik]

You can get help from this project https://www.engineersgarage.com/contribution/increasing-range-rf-module-using-antenna

[Saatwik]

Let's consider AC negative voltage range is the change of polarity So change the terminal of DC voltage that become negative voltage. if you want to do this microcontroller then use L293D to switch polarity .

[Author]

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